Oncotelic Therapeutics, Inc. - Annual Report: 2011 (Form 10-K)

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

     For the fiscal year ended December 31, 2011

     For the transition period from              to             

Commission file number: 0-21990

OXiGENE, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (650) 635-7000

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

None

(Title of class)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ¨     No  þ

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.    Yes  ¨     No  þ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  þ     No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  þ    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K, or any amendment to this Form 10-K.  þ

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨     No  þ

The aggregate market value of the registrant’s voting and non-voting common stock held by non-affiliates of the registrant (without admitting that any person whose shares are not included in such calculation is an affiliate) computed by reference to the price at which the common stock was last sold, as of June 30, 2011 was $34,155,000.

As of March 22, 2012, the aggregate number of outstanding shares of common stock of the registrant was 16,175,092.

DOCUMENTS INCORPORATED BY REFERENCE

Certain portions of the registrant’s definitive Proxy Statement for the 2012 Annual Meeting of Stockholders are incorporated by reference into Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K.

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SAFE HARBOR FOR FORWARD-LOOKING STATEMENTS

UNDER THE SECURITIES LITIGATION REFORM ACT OF 1995

Except for historical information contained herein, this Annual Report on Form 10-K (“Annual Report”) contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements involve known and unknown risks and uncertainties that may cause the Company’s actual results or outcomes to be materially different from those anticipated and discussed herein. Important factors that the Company believes may cause such differences are discussed in the “Risk Factors” section of this Annual Report and in the cautionary statements accompanying the forward-looking statements in this Annual Report. In assessing forward-looking statements contained herein, readers are urged to read carefully all Risk Factors and cautionary statements contained in this Annual Report. Further, the Company operates in an industry sector where securities values may be volatile and may be influenced by regulatory and other factors beyond the Company’s control.

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PART I

Our Company

Our Business

We are a clinical-stage, biopharmaceutical company developing novel therapeutics primarily to treat cancer. Our primary focus is the development of product candidates referred to as vascular disrupting agents, or VDAs, that selectively disable and destroy abnormal blood vessels that provide solid tumors a means of growth and survival, and also are associated with visual impairment in a number of ophthalmological diseases and conditions.

We intend to primarily target the development of our product candidates for the treatment of rare cancers that will be eligible for orphan drug status from the Food and Drug Administration, or FDA. Our lead candidate, ZYBRESTAT, has been awarded orphan drug status by the FDA and the European Commission in the European Union for the treatment of advanced anaplastic thyroid cancer, or ATC, and for the treatment of medullary, Stage IV papillary and Stage IV follicular thyroid cancers. The FDA has also granted Fast Track status to ZYBRESTAT for the treatment of regionally advanced and/or metastatic ATC, as well as in ovarian cancer.

By focusing on developing ZYBRESTAT in ATC, and potentially pursuing other rare or orphan indications, we believe we will be able to take advantage of significant benefits associated with orphan drug status, such as:

The Orphan Drug Act was passed in January 1983 to stimulate the research, development, and approval of products that treat rare diseases. An orphan drug is defined as a product that treats a rare disease affecting fewer than 200,000 patients in the United States. Drugs are granted orphan status for a specific indication.

To date, more than 400 subjects have been treated with ZYBRESTAT in human clinical trials, and the drug candidate has generally been observed to be well-tolerated.

ZYBRESTAT for Oncology

ZYBRESTAT is a reversible tubulin binding agent that works by disrupting the network of blood vessels, or vasculature, within solid tumors, also referred to as vascular disruption. Vascular disruption leads to tumor hypoxia, which refers to the process of starving the tumor of vitally necessary oxygen supply and subsequent tumor cell death. More specifically, ZYBRESTAT selectively targets the existing abnormal and largely immature vasculature found specifically in most solid tumors and causes endothelial cells that make up the walls of the blood vessels in that vasculature to lose their normally flat shape and to become round, thus blocking the flow of blood to the tumor. The downstream tumor environment is then deprived of oxygen and nutrients, and the resulting restriction in blood supply kills the cells in the central portion of the tumor. Based on ZYBRESTAT’s positive activity observed in animal models, we have conducted multiple clinical trials of ZYBRESTAT in a variety of tumor types.

Our top priority is to pursue the clinical development of ZYBRESTAT in ATC. ATC is a very aggressive, rare but lethal cancer of the thyroid gland. Because of the rapid progression of the disease and the absence of effective therapies, median survival from the time of diagnosis is approximately 3-4 months. We have completed a Phase 2/3 clinical trial of ZYBRESTAT in patients with ATC, and we are currently planning a pivotal Phase 3

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clinical trial of ZYBRESTAT in ATC, which we refer to as the FACT 2 trial. We believe that the FACT 2 trial represents a critical opportunity to demonstrate the value of our key asset, ZYBRESTAT, and has the potential to create significant value for our company and our shareholders. As such, our primary corporate strategy for 2012 is to secure sufficient funding to conduct the trial. We also intend to pursue a special protocol assessment (SPA) for this program with the FDA, with the goal of laying the foundation for initiation of this global registration study. We believe completion of the FACT2 study, assuming continued positive clinical results, will be sufficient to obtain FDA approval and approval in Europe for the treatment of patients with advanced ATC.

Clinical Development of ZYBRESTAT in anaplastic thyroid cancer (ATC)

In earlier Phase 1 studies of ZYBRESTAT in ATC, clinical investigators observed several objective responses in treatment with ZYBRESTAT, including a complete response lasting more than 13 years, in patients with ATC. A subsequent Phase 2 study in 26 ATC patients showed a 23% rate of one year survival in a disease where median expected survival of patients is approximately 3-4 months from the time of diagnosis and fewer than 10% of patients are typically alive at one year.

We subsequently conducted the FACT (fosbretabulin in anaplastic cancer of the thyroid) trial, a randomized Phase 2/3 study in ATC, which enrolled 80 patients between July 2007 and February 2010. A total of 40 clinical sites in 11 countries participated in this clinical study, which was conducted in accordance with good clinical practice guidelines and a Special Protocol Assessment, or SPA, with the FDA. The trial was originally designed to evaluate ZYBRESTAT in 180 patients as a potential treatment for ATC.

The primary endpoint for the FACT trial was overall survival. Eligible patients were randomized to receive either ZYBRESTAT in combination with the chemotherapeutic agents carboplatin and paclitaxel, or to the control arm of the study, in which they received only carboplatin and paclitaxel. Central pathology review by external pathologists not associated with the study was utilized to confirm the histological diagnosis prior to enrollment of patients.

Due to the rarity of the disease and the fact that many of the patients screened for the study did not meet the trial’s inclusion criteria or either died or no longer met the trial’s inclusion criteria, the enrollment period spanned more than twice the planned 18 month period. As a result of both the length of the enrollment period and financial constraints affecting us, in February 2010, we chose to continue to treat and follow all 80 patients who were enrolled in the Phase 2/3 FACT clinical trial in ATC in accordance with the SPA, but to stop further enrollment.

During a meeting on March 16, 2011, the FDA indicated that the data from the FACT trial are suggestive of possible clinical activity that may warrant continued development, and that to seek regulatory approval, we should plan to conduct an additional clinical trial with a survival endpoint. The FDA also confirmed that, as we expected, the SPA that had been agreed upon at the start of the study is no longer in effect.

In June 2011, Julie Sosa, M.D., Associate Professor of Surgery and of Medicine at Yale University and principal investigator in the Phase 2/3 study, presented final data from the trial at the American Society of Clinical Oncology (ASCO) conference in Chicago, Illinois. Dr. Sosa presented data reflecting a median overall survival (OS) time of 5.2 months for patients who received ZYBRESTAT and chemotherapy compared with 4.0 months for patients receiving chemotherapy alone, representing a 28% reduction in the risk of death for patients receiving ZYBRESTAT and chemotherapy. For patients treated with ZYBRESTAT and chemotherapy, the data suggested that the likelihood of being alive at six months was 48% compared with 35% for patients treated with the control arm regimen. At one year, the data suggested that the likelihood of being alive was 26% for patients treated with ZYBRESTAT and chemotherapy compared with 9% for patients treated with chemotherapy alone. As in other studies, ZYBRESTAT appeared to be well tolerated.

We are currently planning to conduct a pivotal Phase 3 clinical trial of ZYBRESTAT in ATC, the FACT 2 trial, subject to obtaining sufficient financial resources in order to do so. A Company-sponsored Phase 3 registrational study of ZYBRESTAT in patients with ATC, as suggested by the FDA, would require significant additional capital. Due to the rarity of ATC, which afflicts only approximately 4,000 people worldwide per year, and the fact that the median length of survival from time of diagnosis for patients with ATC is only

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approximately 3-4 months, our strategy is to recruit patients to a large number of clinical trial sites to participate in the trial. We are hopeful that we can finance a large portion of the costs of this trial from private and/or public equity offerings; however, clinical trials are extremely costly and time-consuming, particularly in orphan indications such as ATC. Any significant progress related to this clinical trial will be dependent on obtaining sufficient financial resources in order to do so.

In December 2011, we established a partnership agreement to provide access to ZYBRESTAT for the treatment of patients in a specified territory with ATC on a compassionate use basis. Our newly formed named patient program, to be managed by Azanta Danmark A/S, or Azanta, provides a regulatory mechanism to allow healthcare professionals in the territory to prescribe ZYBRESTAT to individual ATC patients while it is still in development. Under the terms of the agreement, we will provide ZYBRESTAT to Azanta, and Azanta will serve as our exclusive distributor for ZYBRESTAT in the specified territory for this purpose. Azanta will provide ZYBRESTAT to physicians solely to treat ATC on a compassionate use basis in the territory covered by the agreement until such time as ZYBRESTAT may obtain marketing approval in that territory. The territory includes the European Union, including the Nordic countries and Switzerland, and Canada, and the agreement may also be expanded to include other countries on a country-by-country basis. We and Azanta will cooperate on regulatory activities relating to ZYBRESTAT for the treatment of ATC within the territory. There will be no transfer of ownership of intellectual property rights for ZYBRESTAT to Azanta under the terms of the agreement.

FALCON (fosbretabulin in advanced lung oncology) trial — randomized, controlled Phase 2 study with ZYBRESTAT in non-small cell lung cancer

We evaluated ZYBRESTAT in a randomized, controlled Phase 2 clinical trial, which we refer to as the FALCON trial, as a potential first-line treatment for stage IIIB/IV non-small cell lung cancer, or NSCLC. In the FALCON trial, patients were randomized either to the treatment arm of the study, in which they received ZYBRESTAT in combination with the chemotherapeutic agents, carboplatin and paclitaxel, and bevacizumab, a drug that interferes with blood vessel growth, or angiogenesis, or to the control arm of the study, in which they received a standard combination regimen of carboplatin, paclitaxel and bevacizumab. The objective of the study was to determine the safety, tolerability, and efficacy of ZYBRESTAT at a dose of 60 mg/m2 in combination with carboplatin, paclitaxel and bevacizumab in Stage IIIB or IV non-squamous NSCLC. Primary endpoints of this study were safety of the combination therapy and progression-free survival; secondary endpoints were overall survival and objective response rate.

Edward Garon, M.D., Assistant Professor of Medicine at the University of California, Los Angeles and primary investigator in the study, presented the progression-free survival data from this study at the ASCO conference in Chicago, Illinois in June 2011. Dr. Garon’s updated analysis, conducted approximately 11 months after the enrollment of the last patient in June 2010, showed that the combination regimen of ZYBRESTAT plus bevacizumab, carboplatin and paclitaxel (ZYBRESTAT arm) appeared to be well-tolerated with no significant cumulative toxicities when compared with the control arm of the study. Dr. Garon’s presentation also included data on the achieved rate of objective response. In terms of Partial Response as Best Overall Tumor Response (Intent to Treat) patients on the active treatment arm including ZYBRESTAT achieved a 56% rate of objective response according to RECIST criteria, as compared to 36% on the control arm. Further analysis also suggested that the addition of ZYBRESTAT may benefit patients with a poorer performance status. Poor performance status in this context refers to patients who present with higher tumor burden or larger tumors, who have additional medical complications, who suffer from additional illnesses such as emphysema or diabetes, or who may be taking other medications.

Since the initial presentation of the progression-free survival data at ASCO 2011, the overall survival follow-up has continued with each patient having been followed for survival for at least one year following the initiation of study therapy. The final results from this analysis were available in November 2011, and the analysis of the data showed that the combination regimen of ZYBRESTAT plus bevacizumab, carboplatin and paclitaxel (ZYBRESTAT arm) was observed to be well-tolerated with no significant cumulative toxicities or overlapping toxicities with bevacizumab when compared with the control arm of the study (standard chemotherapy plus bevacizumab). However, for the overall patient population, no survival benefit was observed for patients

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receiving ZYBRESTAT. Similar to the initial findings regarding progression-free survival, an analysis of patients with more advanced disease as indicated by a tumor burden greater than 10 cm or poor performance status suggested meaningful improvements in overall survival for patients receiving ZYBRESTAT in addition to bevacizumab and chemotherapy.

While we believe that these data could be used to design a specific clinical program with ZYBRESTAT and more generally, provide clinical validation supporting further evaluation of ZYBRESTAT in patients with poor-prognosis NSCLC in combination with standard chemotherapy and anti-VEGF therapy, there is no precedent and no established regulatory pathway for such an approach. Therefore, we are not currently actively pursuing poor-prognosis NSCLC as a target indication.

ZYBRESTAT in ovarian cancer

At the 2009 ASCO Annual Meeting, we reported positive final data from an investigator-sponsored Phase 2 study of ZYBRESTAT and carboplatin plus paclitaxel chemotherapy in patients with platinum-resistant ovarian cancer. Ovarian cancer is an orphan indication, and OXiGENE has received orphan designation for ZYBRESTAT in this indication.

Based on the results of this Phase 2, single-arm, two-stage study, in February 2011, we entered into a Cooperative Research and Development Agreement (CRADA) with the National Cancer Institute’s (NCI) Cancer Therapy Evaluation Program (CTEP) to collaborate on the conduct of a randomized Phase 2 trial of ZYBRESTAT in combination with bevacizumab in up to 110 patients with relapsed, platinum-sensitive ovarian cancer. Under the terms of the agreement, we are providing ZYBRESTAT to NCI for an NCI-sponsored study being conducted by the Gynecologic Oncology Group (GOG), an organization dedicated to clinical research in the field of gynecologic cancer. The aim of the trial will be to determine if the combination of ZYBRESTAT and bevacizumab will enhance anti-tumor effects and further delay tumor progression when compared to bevacizumab alone. Investigators initiated enrollment in this Phase 2 study in the first half of 2011, and this study is actively recruiting patients. The primary endpoint of the study will be progression-free survival, with results expected to become available in early 2013.

The June 2011 ASCO meeting in Chicago, Illinois included an announcement that the addition of Avastin (bevacizumab) to a chemotherapy regimen reduces the risk of progression in patients with platinum-sensitive ovarian cancer. This is of particular interest to OXiGENE in view of the NCI / CTEP Phase 2 study of ZYBRESTAT in combination with bevacizumab for platinum-sensitive ovarian cancer patients, and we are encouraged to see additional data from other studies supporting use of bevacizumab in platinum-sensitive ovarian cancer patients.

Possible areas for future development

ATC and ovarian cancer, and potentially other orphan indications, represent areas for further development and significant unmet medical needs, and thus significant potential commercial market opportunities.

Further development of our ongoing clinical trials will depend on continuing analysis and results of ongoing clinical studies, as well as available financial resources and/or potential partnering activities.

OXi4503, a unique, second generation VDA for oncology indications

We are currently pursuing development of OXi4503, a second-generation, dual-mechanism VDA, as a treatment for certain solid tumor types and for the treatment of myeloid leukemias, which also represent orphan indications. We believe that OXi4503 is differentiated from other VDAs by its dual-action activity: in addition to having potent vascular disrupting effects, OXi4503 is unique in that certain enzymes in the human body can help convert it to a form of chemical that has direct tumor cell killing effects. We believe this unique property may result in enhanced anti-tumor activity in certain tumor types as compared with other VDA drug candidates. Based on data from preclinical studies, we believe that OXi4503 may have enhanced activity in tumor types with relatively high levels of the enzymes that facilitate the conversion of OXi4503 to the form of chemical that kills tumor cells. These tumor types include hepatocellular carcinoma, melanoma, and leukemias of the myeloid lineage. In preclinical studies, OXi4503 has shown potent anti-tumor activity against solid tumors and acute myeloid leukemia models, both as a single agent and in combination with other cancer treatment modalities.

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We have completed a Phase 1 clinical trial of OXi4503 in patients with advanced solid tumors sponsored by Cancer Research United Kingdom. In collaboration with us, Professor Gordon Rustin and colleagues from the Mount Vernon Cancer Research Centre, UK and other institutions in the United Kingdom, reported positive final data from this study at the 2010 ASCO Annual Meeting. In this study, 45 patients with advanced solid tumors who had declined or were unresponsive to standard treatment were treated with escalating doses of OXi4503. Partial responses were observed in two patients with epithelial ovarian cancer and stable disease was observed in 9 patients. OXi4503 was also observed to be well-tolerated in this study. To date, OXi4503 has been observed to have a manageable side-effect profile similar to that of other agents in the VDA class, potential single-agent clinical activity, and effects on tumor blood flow and tumor metabolic activity, as determined with several imaging modalities. We also evaluated escalating doses of OXi4503 in an OXiGENE-sponsored Phase 1b trial, initiated in the first quarter of 2009 in patients with solid tumors with hepatic involvement. This study confirmed the recommended dose established in the first Phase 1 study. Currently, we are exploring possible clinical studies but we have no firm plans to continue the evaluation of OXi4503 in patients with solid tumors.

Based on the results of preclinical studies published in the journal Blood in September 2010 that show OXi4503 has potent activity against acute myelogenous leukemia (AML) in animal models, we entered into a clinical trial agreement pursuant to which investigators at the University of Florida initiated an investigator sponsored Phase 1 study of OXi4503 in patients with AML or myelodysplastic syndrome (MDS) in May 2011. This open-label, dose-escalating study for the treatment of up to 36 patients is being conducted in patients with relapsed or refractory AML and MDS and will evaluate the safety profile, maximum tolerated dose and biologic activity of OXi4503 in these patients. We expect that initial indications of biologic activity from this study may be available in the fourth quarter of 2012.

The general direction of future development of OXi4503 for hematologic indications will depend on the outcome of the analysis of the study in AML, as well as available financial resources and potential partnering activities.

ZYBRESTAT for Ophthalmology

In addition to developing ZYBRESTAT as an intravenously administered therapy for oncology indications, we have previously undertaken an ophthalmology research and development program with ZYBRESTAT with the ultimate goal of developing a topical formulation of ZYBRESTAT for ophthalmological diseases and conditions that are characterized by abnormal blood vessel growth within the eye that result in loss of vision. Due to financial constraints, we are not actively pursuing development in this area at this time.

In December 2010, we completed a randomized, double-masked, placebo-controlled Phase 2 proof-of-mechanism trial, which we refer to as the FAVOR trial, with a single dose of intravenously-administered ZYBRESTAT in patients with polypoidal choroidal vasculopathy (PCV), a form of choroidal neovascularization, which is a condition where new blood vessels form in the choroid, a part of the eye, and which can lead to vision loss and, ultimately, blindness. Current therapies, including approved drugs that interfere with blood vessel growth, known as anti-angiogenics, appear to provide limited benefit. We believe that the architecture of the abnormal vasculature in certain eye tissues, namely the retina and choroid, which contribute to PCV patients’ loss of vision, may be particularly susceptible to treatment with a VDA such as ZYBRESTAT.

Data from the FAVOR trial, in which ZYBRESTAT at different doses was compared to placebo in patients with PCV, followed by imaging of the retina on days 2, 8, 15, and 28, were presented at the 6th Asia-Pacific VitreoRetina Society (APVRS) Congress in Hyderabad, India on December 2, 2011.

We believe that a safe, effective and convenient topically-administered anti-vascular therapeutic would have advantages over currently approved anti-vascular, ophthalmological therapeutics, many of which must be injected directly into patients’ eyes, in some cases on a chronic monthly basis.

For this purpose we have undertaken preclinical testing of a potential “minitab” topical formulation of ZYBRESTAT which has demonstrated attractive pharmacokinetic and safety properties and efficacy in destroying abnormal vasculature in a rat choroidal melanoma model following administration in the eye. We

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believe that a topical formulation would enhance our partnering opportunities to further develop ZYBRESTAT in diseases of the eye.

We have also evaluated the requirements for additional preclinical toxicology and efficacy studies with ZYBRESTAT for topical ophthalmological formulations to better position the program for partnering. Further development of this program will depend on the outcome of our evaluation of these requirements and available financial resources.

Company Background

We are a Delaware corporation, incorporated in 1988 in the state of New York and reincorporated in 1992 in the state of Delaware, with our principal corporate office in the United States at 701 Gateway Boulevard, Suite 210, South San Francisco, California 94080 (telephone: (650) 635-7000, fax: (650) 635-7001). We also have an office at 300 Bear Hill Road, Waltham, Massachusetts 02451. Our Internet address is www.oxigene.com. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and all amendments to those reports, are available to you free of charge through the “Investors” section of our web site as soon as reasonably practicable after such materials have been electronically filed with, or furnished to, the Securities and Exchange Commission. Information contained on our web site does not form a part of this Form 10-K.

VASCULAR DISRUPTING AGENTS: ANTI-VASCULAR THERAPEUTICS THAT ADDRESS A LARGE POTENTIAL MARKET OPPORTUNITY

According to Cancer Research UK, a cancer organization in the United Kingdom, nearly 90% of all cancers, more than 200 types, are solid tumors, which are dependent upon a continually developing vascular supply for their growth and survival. Similarly, in the ophthalmology field, abnormal neovascularization characterizes a variety of ophthalmological diseases and conditions, including corneal neovascularization, central retinal vein occlusion, proliferative diabetic retinopathy, retinopathy of prematurity, sickle cell retinopathy, myopic macular degeneration (MMD), age-related macular degeneration (AMD), and neovascular glaucoma.

Since 2004, multiple drugs that interfere with blood vessel growth or anti-angiogenics (see table below), have been approved for a variety of cancer and ophthalmology indications, and development of approved anti-angiogenic drugs for new indications continues. Physician adoption of these first-generation anti-vascular drugs has been rapid and continues to accelerate.

We believe that our VDA drug candidates are second-generation anti-vascular drugs that differ from and are complementary and non-competitive with anti-angiogenic agents. Similar to anti-angiogenic agents, our VDA drug candidates are anti-vascular drugs that exert therapeutic effects by depriving tumors and in the case of eye disease, ocular lesions of blood supply. We also believe that our VDA therapeutics may be better tolerated than anti-angiogenic drugs and may potentially have utility in later-stage tumors that have become unresponsive to anti-angiogenic therapies.

In September 2006, we announced the publication of a research article in the journal Science that provided strong scientific evidence for combining VDAs with anti-angiogenic agents such as bevacizumab, a widely-used anti-angiogenic drug that acts by inhibiting VEGF, a pro-angiogenic growth factor. In this article, Professor Kerbel and Dr. Shaked from Sunnybrook Cancer Centre in Canada demonstrated that the combination of ZYBRESTAT and an anti-angiogenic agent (an anti-VEGF-receptor antibody) had synergistic effects on tumors.

In December 2007, we completed a Phase 1b clinical trial to evaluate ZYBRESTAT in combination with bevacizumab (an approved and widely-used anti-VEGF monoclonal antibody) in patients with advanced solid tumors. This was the first human clinical trial to pair a vascular disrupting agent and an anti-angiogenic drug in the treatment of cancer, specifically in patients who had failed previous treatments and were in advanced stages of disease. The trial was an open-label, multi-center trial designed to determine the safety and tolerability of ascending doses of ZYBRESTAT administered intravenously in combination with bevacizumab. Three dose levels of ZYBRESTAT were evaluated in combination with an approved dose of bevacizumab. In May of 2008, we reported final data from the trial showing that the two-drug combination appeared to be well-tolerated with early signs of clinical efficacy (9 of 16 patients with stable disease responses with prolonged stable disease observed in several patients) and additive effects on tumor blood-flow inhibition.

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We believe that these pre-clinical and clinical research results suggest combining VDA and anti-angiogenic therapies may be a compelling strategy to maximize the therapeutic potential of VDAs and anti-angiogenic drugs in the treatment of solid tumors. We believe the potential ability to synergistically combine VDA drugs with anti-angiogenic therapeutics affords it a wide range of future development and commercialization options with our VDA drug candidates, including tumor types and treatment settings where anti-angiogenic drugs are commonly utilized, as well as those where anti-angiogenic agents are either poorly tolerated, ineffective, no longer effective, or not commonly utilized.

As illustrated in the table below, VDA and anti-angiogenic drugs act via different mechanisms to produce complementary biological and anti-vascular effects with mostly non-overlapping side effects. In pre-clinical studies, VDA plus anti-angiogenic drug combinations demonstrate robust and additive anti-tumor effects. Results from initial human clinical studies conducted by us with combinations of ZYBRESTAT and the widely-used anti-angiogenic drug, bevacizumab, provide support and initial clinical validation for combining these agents to significantly increase clinical activity without significantly increasing side-effects.

We believe our VDA drug candidates act on tumor blood vessels via two complementary mechanisms, tubulin depolymerization and disengagement of the junctional protein VE-cadherin, which cause shape change of tumor vascular endothelial cells, vessel occlusion and collapse, and the subsequent blockage of blood-flow to the tumor, which deprives it of oxygen and nutrients essential for survival.

In vitro studies have demonstrated that our VDA drug candidates act in a reversible fashion on a protein called tubulin inside newly-formed and growing endothelial cells, such as the vascular endothelial cells comprising tumor

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vasculature. By binding to the tubulin, ZYBRESTAT is able to collapse the structural framework that maintains the cells’ flat shape. When this occurs, the shape of the cells changes from flat to round, initiating a cascade of events resulting in physical blockage of the blood vessels. The resulting shutdown in blood-flow then deprives tumor cells of the oxygen and nutrients necessary for maintenance and growth and also prevents tumor cells from being able to excrete toxic metabolic waste products. The consequence of the blockage is extensive tumor cell death, as demonstrated in animal studies and suggested in imaging studies of human patients treated with ZYBRESTAT and OXi4503.

Pre-clinical research, published in the November 2005 issue of the Journal of Clinical Investigation, showed that ZYBRESTAT also disrupts the molecular engagement of VE-cadherin, a junctional protein important for endothelial cell survival and function. The authors of the research article conclude that this effect only occurs in endothelial cells which lack contact with smooth muscle cells, a known feature of abnormal vasculature associated with tumors and other disease processes. The disengagement of VE-cadherin leads to endothelial cell detachment, which in turn, can cause permanent physical blockage of vessels.

Pre-clinical and clinical study results indicate that ZYBRESTAT exerts anti-vascular effects rapidly, within hours of administration, and the half-life of the active form of ZYBRESTAT in humans is approximately four hours. Because the half-life of the active form of ZYBRESTAT is relatively short, the effects of ZYBRESTAT on tubulin are reversible, and ZYBRESTAT is typically administered no more frequently than once per week, the side-effects of ZYBRESTAT are typically transient in nature, limited to the period of time following administration when the active form of ZYBRESTAT is in the body in significant concentrations. This contrasts with drugs that interfere with blood vessel growth, known as anti-angiogenic agents, which are typically administered on a chronic basis so as to constantly maintain levels of drug in the body, exert their tumor blood-vessel growth inhibiting effects over days to weeks, and as a result can cause a variety of chronic side-effects that are not limited to the immediate period following administration.

In contrast with anti-angiogenic agents, which can cause a variety of chronic side-effects, side-effects associated with ZYBRESTAT are typically transient and manageable. The most frequent ZYBRESTAT side-effects include infusion-related side effects such as nausea, vomiting, headache and fatigue, and tumor pain, which is consistent with the drug’s mechanism-of-action. Like approved anti-angiogenic drugs, ZYBRESTAT also exhibits cardiovascular effects, which in the majority of patients are mild and transient in nature. Approximately 10-20% of patients treated with ZYBRESTAT experience clinically-significant and transient hypertension that can be readily managed and prevented after initial occurrence with straightforward oral anti-hypertensive therapy. In an analysis undertaken by us, the incidence of serious cardiovascular side-effects such as angina and myocardial ischemia observed across all studies to date (including early studies in which hypertension management and prevention was not employed) was less than 3%, a frequency comparable to that reported with approved anti-angiogenic agents such as bevacizumab, sunitinib and sorafenib.

RESEARCH AND DEVELOPMENT AND COLLABORATIVE ARRANGEMENTS

Our strategy is to develop innovative therapeutics for oncology and to leverage our drug candidates and technology in the field of ophthalmology. Our principal focus is to advance the clinical development of our drug candidates ZYBRESTAT and OXi4503 and to identify new pre-clinical candidates that are complementary to our VDAs. To advance our strategy, we have established relationships with universities, research organizations and other institutions in these fields.

We intend to continue to rely on these relationships, rather than expand our in-house research and development staff. In general, these programs are created, developed and controlled by our internal management. Currently, we have collaborative agreements and arrangements with a number of institutions in the United States and abroad, which we utilize to perform the day-to-day activities associated with drug development. In 2011, collaborations were ongoing with a variety of university and research institutions, including the following:

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We have secured a technology license from Arizona State University (ASU). The ASU license is an exclusive, world-wide, royalty-bearing license for commercial development, use and sale of products or services covered by certain patent rights to particular combretastatins, including among others, OXi4503. Under the ASU license, we have the right to grant sublicenses. ASU is entitled to single-digit royalty and milestone payments under the license agreement. We bear the costs of preparing, filing, prosecuting and maintaining all patent applications under the ASU license. Under the license agreement, we have agreed to diligently proceed with the development, manufacture and sale of products using the licensed technology. ASU has the first responsibility of enforcing patents under the license agreement. Either party may terminate the license agreement upon material default or bankruptcy of the other party. Payments made to ASU to date have amounted to $2,500,000. The agreement is to terminate on December 31, 2014 or within two months of receipt of written notice of termination from us.

Under a sponsored research agreement with Baylor University, we are pursuing discovery and development of additional novel, small-molecule therapeutics for the treatment of cancer, including small-molecule cathepsin-L inhibitors and hypoxia-activated VDAs. Cathepsin-L is an enzyme involved in protein degradation and has been shown to be closely involved in the processes of angiogenesis and metastasis. Small molecule inhibitors may have the potential to slow tumor growth and metastasis in a manner we believe could be complementary with our VDA therapeutics. We also believe that our hypoxia-activated VDAs could serve as line-extension products to ZYBRESTAT and/or OXi4503. We also have a license and research agreement from Baylor University. The Baylor agreement provides an exclusive license to all novel compositions developed under a research program that we fund, which focuses on novel compounds for the treatment of vascular disorders, inflammation, parasitic diseases and infections, fungal diseases and infections and/or cancer. We have the right to grant sublicenses under the Baylor license. The agreement with Baylor requires that we either fund the research program from year to year or pay a minimum annual license fee of up to $40,000. The agreement stipulates that we will pay royalties up to the low-single-digits should sales be generated through use of Baylor’s licensed compounds. We are not required to pay Baylor for use of Baylor’s compounds other than pursuant to this arrangement. We are entitled to file, prosecute and maintain patent applications on products for which we have a license under this agreement. We have made a one-time payment of $50,000 for the licensing fee that was used as a credit against research expenses generated by Baylor and we continue to fund the research program under the Baylor agreement. The term of the license shall end upon the expiration of the licensed patents. The latest United States patent licensed under this agreement is scheduled to expire in June 2026.

We also have an exclusive, world-wide, royalty-bearing license from Bristol-Myers Squibb (BMS) for commercial development, use and sale of products or services covered by certain patent rights to particular combretastatins, including among others, ZYBRESTAT. Under the BMS license, we have the right to grant sublicenses. BMS is entitled to low-single-digit royalty payments under the license agreement. All licensing fees and milestone payments under the license agreement, in the aggregate amount of $1,080,000, have been paid. We bear the costs of preparing, filing, prosecuting and maintaining all patent applications under the BMS license and have a right, but not a duty, of enforcing patents covered by the license. Either party may terminate the license upon material default of the other party. The term of the license shall end upon the expiration of the licensed patents. The latest United States patent licensed under this agreement is scheduled to expire in December 2021.

REGULATORY MATTERS

Government Regulation and Product Approval

Government authorities in the United States, at the federal, state and local level, and other countries extensively regulate, among other things, the research, development, testing, manufacture, quality control, approval, labeling, packaging, storage, record-keeping, promotion, advertising, distribution, marketing and export and import of products such as those we are developing. Our drugs must be approved by FDA through the new drug application, or NDA, process before they may be legally marketed in the United States.

U.S. Drug Development Process

In the United States, the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or FDCA, and implementing regulations. The process of obtaining regulatory approvals and the subsequent compliance

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with appropriate federal, state, local, and foreign statutes and regulations require the expenditure of substantial time and financial resources. Failure to comply with the applicable United States requirements at any time during the product development process, approval process or after approval, may subject an applicant to administrative or judicial sanctions. These sanctions could include the FDA’s refusal to approve pending applications, withdrawal of an approval, a clinical hold, warning letters, product recalls, product seizures, total or partial suspension of production or distribution injunctions, fines, refusal of government contracts, restitution, disgorgement, or civil or criminal penalties. Any agency or judicial enforcement action could have a material adverse effect on us. The process required by the FDA before a drug may be marketed in the United States generally involves the following:

The testing and approval process requires substantial time, effort and financial resources, and we cannot be certain that any approvals for our product candidates will be granted on a timely basis, if at all.

Once a pharmaceutical candidate is identified for development it enters the pre-clinical testing stage. Pre-clinical tests include laboratory evaluations of product chemistry, toxicity and formulation, as well as animal studies. An IND sponsor must submit the results of the pre-clinical tests, together with manufacturing information and analytical data, to the FDA as part of the IND. The sponsor will also include a protocol detailing, among other things, the objectives of the clinical trial, the parameters to be used in monitoring safety, and the effectiveness criteria to be evaluated, if the first phase lends itself to an efficacy evaluation. Pre-clinical testing continues even after the IND is submitted. The IND automatically becomes effective 30 days after receipt by the FDA, unless the FDA, within the 30-day time period, places the clinical trial on a clinical hold. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. Clinical holds also may be imposed by the FDA at any time before or during studies due to safety concerns or non-compliance.

All clinical trials must be conducted under the supervision of one or more qualified investigators in accordance with Good Clinical Practice regulations. These regulations include the requirement that all research subjects provide informed consent. Further, an institutional review board, or IRB, must review and approve the plan for any clinical trial before it commences at any institution. An IRB considers, among other things, whether the risks to individuals participating in the trials are minimized and are reasonable in relation to anticipated benefits. The IRB also approves the information regarding the trial and the consent form that must be provided to each trial subject or his or her legal representative and must monitor the study until completed.

Each new clinical protocol must be submitted to the IND for FDA review, and to the IRBs for approval. Protocols detail, among other things, the objectives of the study, dosing procedures, subject selection and exclusion criteria, and the parameters to be used to monitor subject safety.

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Human clinical trials are typically conducted in three sequential phases that may overlap or be combined:

During the development of a new drug, sponsors may, under certain circumstances request a special protocol assessment, or SPA, from the FDA. For example, a sponsor may request an SPA of a protocol for a clinical trial that will form the primary basis of an efficacy claim in an NDA. The request, which must be made prior to commencing the trial, must include the proposed protocol and protocol-specific questions that the sponsor would like the FDA to answer regarding the protocol design, study goals and data analysis for the proposed investigation. After receiving the request, the FDA will consider whether the submission is appropriate for an SPA. If an SPA is appropriate, the FDA will base its assessment on the questions posed by the sponsor. Comments from the FDA review team are supposed to be sent to the sponsor within 45 calendar days of receipt of the request. The sponsor may request a meeting to discuss the comments and any remaining issues and uncertainties regarding the protocol. If the sponsor and the FDA reach agreement regarding the protocol, the agreement will be documented and made part of the administrative record. This agreement may not be changed by the sponsor or the FDA after the trial begins, except (1) with the written agreement of the sponsor and the FDA or (2) if the FDA determines that a substantial scientific issue essential to determining the safety or effectiveness of the drug was identified after the testing began.

Progress reports detailing the results of the clinical trials must be submitted at least annually to the FDA. IND Safety Reports must be submitted to the FDA, IRBs and the investigators for (a) any suspected adverse reaction that is both serious and unexpected; (b) any findings from epidemiological studies, pooled analysis of multiple studies, or clinical studies (other than those already reported in (a); (c) any findings from animal or in vitro testing, whether or not conducted by the sponsor, that suggest a significant risk in humans exposed to the drug, such as reports of mutagenicity, teratogenicity, or carcinogenicity or reports of significant organ toxicity at or near the expected human exposure; and (d) any clinically important increase in the rate of a serious suspected adverse reaction over that listed in the protocol or investigator brochure. Phase 1, Phase 2, and Phase 3 testing may not be completed successfully within any specified period, if at all. The FDA or the sponsor may suspend a clinical trial at any time on various grounds, including a finding that the research subjects or patients are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the drug has been associated with unexpected serious harm to patients.

Concurrent with clinical trials, companies usually complete additional animal studies and must also develop additional information about the chemistry and physical characteristics of the drug and finalize a process for manufacturing the product in commercial quantities in accordance with cGMP requirements. The manufacturing process must be capable of consistently producing quality batches of the product candidate and, among other things, the manufacturer must develop methods for testing the identity, strength, quality and purity of the final drug. Additionally, appropriate packaging must be selected and tested and stability studies must be conducted to demonstrate that the product candidate does not undergo unacceptable deterioration over its shelf life.

U.S. Review and Approval Processes

The results of product development, pre-clinical studies and clinical trials, along with descriptions of the manufacturing process, analytical tests conducted on the chemistry of the drug, proposed labeling, and other

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relevant information are submitted to the FDA as part of an NDA requesting approval to market the product. The submission of an NDA is subject to the payment of user fees; a waiver of such fees may be obtained under certain limited circumstances.

In addition, under the Pediatric Research Equity Act, or PREA, an NDA or supplement to an NDA must contain data to assess the safety and effectiveness of the drug for the claimed indications in all relevant pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for which the drug is safe and effective. The FDA may grant deferrals for submission of data or full or partial waivers. Unless otherwise required by regulation, PREA does not apply to any drug for an indication for which orphan designation has been granted.

The FDA reviews all NDAs submitted to ensure that they are sufficiently complete for substantive review before it accepts them for filing. The FDA may request additional information rather than accept an NDA for filing. In this event, the NDA must be resubmitted with the additional information. The resubmitted application also is subject to review before the FDA accepts it for filing. Once the submission is accepted for filing, the FDA begins an in-depth substantive review. The FDA may refer the NDA to an advisory committee for review, evaluation and recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendation of an advisory committee, but it generally follows such recommendations. The approval process is lengthy and difficult and the FDA may refuse to approve an NDA if the applicable regulatory criteria are not satisfied or may require additional clinical or other data and information. Even if such data and information are submitted, the FDA may ultimately decide that the NDA does not satisfy the criteria for approval. Data obtained from clinical trials are not always conclusive and the FDA may interpret data differently than we interpret the same data. The FDA may issue a complete response letter, which may require additional clinical or other data or impose other conditions that must be met in order to secure final approval of the NDA. The FDA reviews an NDA to determine, among other things, whether a product is safe and effective for its intended use and whether its manufacturing is cGMP-compliant to assure and preserve the product’s identity, strength, quality and purity. Before approving an NDA, the FDA will inspect the facility or facilities where the product is manufactured. The FDA will also inspect selected clinical sites that participated in the clinical studies and may inspect the testing facilities that performed the GLP toxicology studies cited in the NDA.

NDAs receive either standard or priority review. A drug representing a significant improvement in treatment, prevention or diagnosis of disease may receive priority review. In addition, products studied for their safety and effectiveness in treating serious or life-threatening illnesses and that provide meaningful therapeutic benefit over existing treatments may receive accelerated approval and may be approved on the basis of adequate and well-controlled clinical trials establishing that the drug product has an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit or on the basis of an effect on a clinical endpoint other than survival or irreversible morbidity. As a condition of approval, the FDA may require that a sponsor of a drug receiving accelerated approval perform adequate and well-controlled post-marketing clinical trials. Priority review and accelerated approval do not change the standards for approval, but may expedite the approval process.

If a product receives regulatory approval, the approval may be significantly limited to specific diseases and dosages or the indications for use may otherwise be limited, which could restrict the commercial value of the product. In addition, the FDA may require us to conduct Phase 4 testing, which involves clinical trials designed to further assess a drug’s safety and effectiveness after NDA approval, and may require testing and surveillance programs to monitor the safety of approved products which have been commercialized.

Orphan Drug Designation

Under the Orphan Drug Act, the FDA may grant orphan drug designation to a drug intended to treat a rare disease or condition, which is generally a disease or condition that affects fewer than 200,000 individuals in the United States, or more than 200,000 individuals in the United States and for which there is no reasonable expectation that the cost of developing and making available in the United States a drug for this type of disease or condition will be recovered from sales in the United States for that drug. Orphan drug designation must be requested before submitting an NDA. After the FDA grants orphan drug designation, the identity of the therapeutic agent and its potential orphan use are disclosed publicly by the FDA. Orphan drug designation does not convey any advantage in or shorten the duration of the regulatory review and approval process.

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If a product that has orphan drug designation subsequently receives the first FDA approval for the disease for which it has such designation, the product is entitled to orphan product exclusivity, which means that the FDA may not approve any other applications to market the same drug for the same indication, except in very limited circumstances, for seven years. Orphan drug exclusivity, however, also could block the approval of one of our products for seven years if a competitor obtains approval of the same drug as defined by the FDA or if our product candidate is determined to be contained within the competitor’s product for the same indication or disease.

In the European Union and Japan, orphan drug exclusivity regulations provide for 10 years of marketing exclusivity for orphan drugs that are approved for the treatment of rare diseases or conditions.

ZYBRESTAT was awarded orphan drug status by the FDA for the treatment of anaplastic, medullary, Stage IV papillary and Stage IV follicular thyroid cancers, as well as in Ovarian cancer and by the European Commission in the European Union for the treatment of anaplastic thyroid cancer.

Expedited Review and Approval

The FDA has various programs, including Fast Track, priority review, and accelerated approval, which are intended to expedite or simplify the process for reviewing drugs, and/or provide for approval on the basis of surrogate endpoints. Even if a drug qualifies for one or more of these programs, we cannot be sure that the FDA will not later decide that the drug no longer meets the conditions for qualification or that the time period for FDA review or approval will be shortened. Generally, drugs that may be eligible for these programs are those for serious or life-threatening conditions, those with the potential to address unmet medical needs, and those that offer meaningful benefits over existing treatments. Fast Track designation applies to the combination of the product and the specific indication for which it is being studied. Although Fast Track and priority review do not affect the standards for approval, the FDA will attempt to facilitate early and frequent meetings with a sponsor of a Fast Track designated drug and expedite review of the application for a drug designated for priority review. Drugs that receive an accelerated approval may be approved on the basis of adequate and well-controlled clinical trials establishing that the drug product has an effect of a surrogate endpoint that is reasonably likely to predict clinical benefit or on the basis of an effect on a clinical endpoint other than survival or irreversible morbidity. As a condition of approval, the FDA may require that a sponsor of a drug receiving accelerated approval perform post-marketing clinical trials.

The FDA has granted Fast Track designation to ZYBRESTAT for the treatment of regionally advanced and/or metastatic ATC.

Foreign Regulation

Before our products can be marketed outside of the United States, they are subject to regulatory approval similar to that required in the United States, although the requirements governing the conduct of clinical trials, including additional clinical trials that may be required, product licensing, pricing and reimbursement vary widely from country to country. No action can be taken to market any product in a country until an appropriate application has been approved by the regulatory authorities in that country. The current approval process varies from country to country, and the time spent in gaining approval varies from that required for FDA approval. In certain countries, the sales price of a product must also be approved. The pricing review period often begins after market approval is granted. Even if a product is approved by a regulatory authority, satisfactory prices may not be approved for such product.

In Europe, marketing authorizations may be submitted at a centralized, a decentralized or national level. The centralized procedure is mandatory for the approval of biotechnology products and provides for the grant of a single marketing authorization that is valid in all European Union members’ states. As of January 1995, a mutual recognition procedure is available at the request of the applicant for all medicinal products that are not subject to the centralized procedure. There can be no assurance that the chosen regulatory strategy will secure regulatory approvals on a timely basis or at all.

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PATENTS AND PROPRIETARY RIGHTS

We actively seek to protect the proprietary technology that we consider important to our business, including chemical species, compositions and forms, their methods of use and processes for their manufacture, as well as modified forms of naturally-expressed receptors, in the United States and other jurisdictions internationally that we consider key pharmaceutical markets. We also rely upon trade secrets and contracts to protect our proprietary information.

As of March 9, 2012, we were the exclusive licensee, sole assignee or co-assignee of twenty-eight (28) granted United States patents, sixteen (16) pending United States patent applications, two (2) pending Patent Cooperation Treaty international patent applications and granted patents and/or pending applications in several other major markets, including the European Union, Canada and Japan. Our policy is to file United States and foreign patent applications to protect technology, inventions and improvements to inventions that are commercially important to the development of our business. There can be no assurance that any of these patent applications will result in the grant of a patent either in the United States or elsewhere, or that any patents granted will be valid and enforceable, or will provide a competitive advantage or will afford protection against competitors with similar technologies. We also intend to rely upon trade secret rights to protect other technologies that may be used to discover and validate targets and that may be used to identify and develop novel drugs. We seek protection, in part, through confidentiality and proprietary information agreements.

We consider the following United States patents owned by or exclusively licensed to us to be particularly important to the protection of our most advanced product candidates.

In addition to these patents, for some of our product candidates, we have patents and/or applications that cover a particular form or composition, used as part of combination therapy or method of preparation or use, as well as other pending patent applications. These issued patents, including any patents that issue from pending applications, could provide additional or a longer period of protection. We also have patent applications pending that seek equivalent or substantially comparable protection for our product candidates in jurisdictions internationally that we consider key pharmaceutical markets.

The patent expiration dates referenced above do not reflect any potential patent term extension that we may receive under the federal Drug Price Competition and Patent Term Restoration Act of 1984, known as the Hatch-Waxman Act. The Hatch-Waxman Act generally permits a patent extension term of up to five years as compensation for patent term lost during the FDA regulatory review process. Patent extension cannot extend the remaining term of a patent beyond a total of 14 years. The patent term restoration period is generally one-half of the time between the effective date of an investigational new drug application, or IND, and the submission date of a new drug application, or NDA, plus the time between the submission date and approval date of an NDA. Only one patent applicable to an approved drug is eligible for the extension, and the extension must be applied for prior to expiration of the patent. The United States Patent and Trademark Office, in consultation with the FDA, reviews and approves applications for patent term extension.

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COMPETITION

The industry in which we are engaged is characterized by rapidly evolving technology and intense competition. Our competitors include, among others, major pharmaceutical, biopharmaceutical and biotechnology companies, many of which have financial, technical and marketing resources significantly greater than ours. In addition, many of the small companies that compete with us have also formed collaborative relationships with large, established companies to support research, development, clinical trials and commercialization of products that may be competitive with ours. Academic institutions, governmental agencies and other public and private research organizations are also conducting research activities and seeking patent protection and may commercialize products on their own or through joint ventures or other collaborations.

We are aware of a limited number of companies involved in the development of VDAs. Such companies include Sanofi-Aventis, Myrexis, Nereus and MediciNova, all of which have VDAs that management believes are at an earlier or similar stage of clinical development than our lead drug candidate, ZYBRESTAT.

We expect that, if any of our products gain regulatory approval for sale, they will compete primarily on the basis of product efficacy, safety, patient convenience, reliability, price and patent protection. Our competitive position will also depend on our ability to attract and retain qualified scientific and other personnel, develop effective proprietary products and implement joint ventures or other alliances with large pharmaceutical companies in order to jointly market and manufacture our products.

EMPLOYEES

We expect to continue to maintain a relatively small number of executives and other employees. We rely on outsourcing much of our research, development, pre-clinical testing and clinical trial activity, although we maintain managerial and quality control over its clinical trials. As of March 9, 2012, we had a total of eight full-time employees and approximately three full-time equivalent employees working on a part-time basis.

Statements in this Annual Report under the captions “Business” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” as well as oral statements that may be made by the Company or by officers, directors or employees of the Company acting on the Company’s behalf, that are not historical fact constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements involve known and unknown risks, uncertainties and other factors that could cause the actual results of the Company to be materially different from the historical results or from any results expressed or implied by such forward-looking statements. Such factors include, but are not limited to, the risk factors set forth below.

We do not intend to update any forward-looking statements to reflect events or circumstances after the date of such statements or to reflect the occurrence of anticipated or unanticipated events.

We will be required to raise additional funds to finance our operations, continue the development of our product candidates and remain a going concern; we may not be able to do so when necessary, and/or the terms of any financings may not be advantageous to us.

Our operations to date have consumed substantial amounts of cash. Negative cash flows from our operations are expected to continue over at least the next several years. Our cash utilization amount is highly dependent on the progress of our product development programs, particularly, the results of our preclinical and clinical studies and those of our partners, the cost, timing and outcomes of regulatory approval for our product candidates, the terms and conditions of our contracts with service providers for these programs, and the rate of recruitment of patients in our human clinical trials. In addition, the further development of our ongoing clinical trials will depend on upcoming analysis and results of those studies and our financial resources at that time.

In addition to our purchase agreement with Lincoln Park Capital, we are aggressively pursuing other forms of capital infusion including public or private financing, strategic partnerships or other arrangements with organizations that have capabilities and/or products that are complementary to our own capabilities and/or

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products, in order to continue the development of our product candidates. However, there can be no assurances that we will complete any strategic alliances or collaborative development agreements, and the terms of such arrangements may not be advantageous to us.

Based on our limited ongoing programs and operations and taking into consideration the expected reductions in cash utilization resulting from our September 2011 reduction in force, we expect our existing cash and cash equivalents to support our operations through the first quarter of 2013. However, this level of cash utilization does not provide for the initiation of any significant projects to further the development of our most advanced product candidates, primarily ZYBRESTAT in ATC. Any significant further development of ZYBRESTAT or other capital intensive activities, including but not limited to the FACT 2 trial, will be contingent upon our ability to raise additional capital in addition to our existing financing arrangements.

Our ongoing capital requirements will depend on numerous factors, including: the progress and results of preclinical testing and clinical trials of our product candidates under development, and in particular whether we initiate the proposed FACT 2 study in ATC; the costs of complying with FDA and other regulatory agency requirements, including addressing findings set forth by the FDA in its correspondence to us in March 2012, which will be significant – as described in the Risk Factors below regarding the conduct of clinical trials and regulatory requirements; the progress of our research and development programs and those of our partners; the time and costs expended and required to obtain any necessary or desired regulatory approvals; the resources, if any, that we devote to develop manufacturing methods and advanced technologies; our ability to enter into licensing arrangements, including any unanticipated licensing arrangements that may be necessary to enable us to continue our development and clinical trial programs; the costs and expenses of filing, prosecuting and, if necessary, enforcing our patent claims, or defending against possible claims of infringement by third-party patent or other technology rights; the cost of commercialization activities and arrangements, if any, undertaken by us; and, if and when approved, the demand for our products, which demand depends in turn on circumstances and uncertainties that cannot be fully known, understood or quantified unless and until the time of approval, including the range of indications for which any product is granted approval.

If we are unable to raise additional funds when needed, we will not be able to continue development of our product candidates or we will be required to delay, scale back or eliminate some or all of our development programs or cease operations. We may seek to raise additional funds through public or private financing, strategic partnerships or other arrangements. Any additional equity financing may be dilutive to our current stockholders and debt financing, if available, may involve restrictive covenants. If we raise funds through collaborative or licensing arrangements, we may be required to relinquish, on terms that are not favorable to us, rights to some of our technologies or product candidates that we would otherwise seek to develop or commercialize. Our failure to raise capital when needed will materially harm our business, financial condition and results of operations. Our ability to raise additional capital could also be impaired if our common shares lose their status on The NASDAQ Capital Market. As a result of this uncertainty and the substantial doubt about our ability to continue as a going concern as of December 31, 2011, the Report of Independent Registered Public Accounting Firm at the beginning of the Consolidated Financial Statements section in this Form 10-K includes a going concern explanatory paragraph.

Our facility with LPC will not be sufficient to satisfy our capital requirements for all of our contemplated clinical trials.

In November 2011, we entered into a purchase agreement for the sale, from time to time, of up to $20,000,000 of our common stock with Lincoln Park Capital Fund, LLC (LPC), a Chicago-based institutional investor. We may direct LPC to purchase up to $20,000,000 worth of shares of our common stock under our agreement over a 36-month period, in amounts of up to $200,000, which amounts may be increased under certain circumstances. We will not have the ability to sell shares under this arrangement if we fail to maintain a minimum stock price or if we fail to maintain the effectiveness of a registration statement filed with the Securities and Exchange Commission. In addition, as a result of Nasdaq rules, we cannot sell Lincoln Park more than 2,974,483 shares of our common stock, representing 19.9% of our outstanding shares at the time we entered into the Lincoln Park facility in November 2011, at an average price per share that is less than $1.3051 (the deemed market value per share of our common stock for purposes of the agreement). At our current stock price,

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this would mean that we cannot access more than approximately $3 million of the $20 million in potential proceeds under the Lincoln Park facility without obtaining shareholder approval, which we intend to do at our 2012 annual meeting of shareholders. The funding available from LPC may not be available when needed, or at all, depending on the market price of our common stock.

The extent to which we rely on LPC as a source of funding will depend on a number of factors, including the prevailing market price of our common stock and the extent to which we are able to secure working capital from other sources. If obtaining sufficient funding from LPC were to prove impracticable or prohibitively dilutive, we will need to secure another source of funding in order to satisfy our working capital needs. Even if we sell the maximum amount we are eligible to sell to LPC under the purchase agreement, we will still need additional capital to fully implement our business, operating and development plans. Should the financing we require to sustain our working capital needs be unavailable or prohibitively expensive when we require it, the consequences would have a material adverse effect on our business, operating results, financial condition and prospects.

Due in part to our constrained financial resources, we may fail to select or capitalize on the most scientifically, clinically or commercially promising or profitable indications or therapeutic areas for our product candidates or those that are in-licensed, and/or we may be unable to pursue the clinical trials that we would like to pursue.

We have limited technical, managerial and financial resources to determine the indications on which we should focus the development efforts related to our product candidates. Due to our limited available financial resources, we have had to curtail clinical development programs and activities that might otherwise have led to more rapid progress of our product candidates through the regulatory and development processes. For example, in February 2010 we announced a restructuring of our clinical development programs. As a part of that restructuring, we stopped enrollment in our FACT trial and have redirected available resources away from other clinical trial programs in favor of those we believe to have the highest value. In addition, in September 2011, we implemented a reduction in force, and now have only a limited number of employees to manage and operate our business and clinical programs.

We intend to pursue a second clinical trial of ZYBRESTAT in ATC, but our current financial resources are insufficient to allow us to do so without substantial additional funding. Due to the rarity of ATC, which afflicts only approximately 4,000 people worldwide per year, and the fact that the median length of survival from time of diagnosis for patients with ATC is only approximately 3-4 months, our strategy is to recruit patients to a large number of clinical trial sites to participate in the trial. This clinical trial will be extremely costly and time-consuming, and we cannot assure you that the results of this trial will be sufficient to form the basis of a successful new drug application or that we will have sufficient financial resources to allow us to complete the trial.

We may make incorrect determinations with regard to the indications and clinical trials on which to focus the available resources that we do have. Furthermore, we cannot assure you that we will be able to retain adequate staffing levels to run our operations and/or to accomplish all of the objectives that we otherwise would seek to accomplish. The decisions to allocate our research, management and financial resources toward particular indications or therapeutic areas for our product candidates may not lead to the development of viable commercial products and may divert resources from better opportunities. Similarly, our decisions to delay or terminate drug development programs may also cause us to miss valuable opportunities. In addition, from time to time, we may in-license or otherwise acquire product candidates to supplement our internal development activities. Those activities may use resources that otherwise would have been devoted to our internal programs. We cannot assure you that any resources that we devote to acquired or in-licensed programs will result in any products that are superior to our internally developed products.

If we or the third parties on which we rely for the conduct of our clinical trials and results do not perform our clinical trial activities in accordance with good clinical practices and related regulatory requirements, we may not be able to obtain regulatory approval for or commercialize our product candidates.

We use independent clinical investigators and, in many cases, contract research organizations and other third-party service providers to conduct and/or oversee the clinical trials of our product candidates and expect to continue to do so. We rely heavily on these parties for successful execution of our clinical trials. Nonetheless, we

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are responsible for confirming that each of our clinical trials is conducted in accordance with the FDA’s requirements and our general investigational plan and protocol. Currently our only clinical trial activities involving ZYBRESTAT are being conducted by physician clinical investigators who are independent of us, but with whom we have agreements for them to provide the results of their clinical trials to us. In order for us to rely on data from these ongoing studies in support of a marketing application, or NDA, for approval of any of our product candidates by the FDA or other regulatory authorities, the independent investigators are required to comply with FDA requirements applicable to their studies.

The FDA and corresponding foreign regulatory authorities require us and our clinical investigators to comply with regulations and standards, commonly referred to as good clinical practices, for conducting and recording and reporting the results of clinical trials to assure that data and reported results are credible and accurate and that the trial participants are adequately protected. Our reliance on third parties that we do not control does not relieve us of these responsibilities and requirements. Third parties may not complete activities on schedule or may not conduct our clinical trials in accordance with regulatory requirements or the respective trial plans and protocols. The failure of these third parties to carry out their obligations could delay or prevent the development, approval and commercialization of our product candidates or result in enforcement action against us.

In February 2012, we were inspected by the FDA, and in March 2012, we received a Form FDA 483 containing observations from that inspection. The Form FDA 483 noted observations of certain deficiencies in the conduct of our FACT trial in ATC, which was conducted from July 2007 – February 2010. These observations related to the FDA’s good clinical practice requirements and included the failure to insure proper monitoring of third party clinical investigators who were participants in our FACT trial, the failure to promptly bring non-compliant clinical investigators into compliance, and the selection of clinical trial monitors by our clinical research organizations, or CROs, outside the United States who were not sufficiently qualified by experience and training to monitor clinical trials. The Form FDA 483 also included observations related to the failure to address the improper storage of a drug that was being used in the trial, and the failure to maintain records and case histories in compliance with FDA regulations. The issues noted in the Form FDA 483 had previously been identified and addressed by our management as part of an internal review, first disclosed by us in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2009, of our systems, practices and procedures governing the areas of vendor oversight, quality, and regulatory compliance.

Our response to the Form FDA 483 describes the corrective actions that we have taken and will continue to take in response to this matter. While we have taken steps and are taking further steps promptly to strengthen our procedures in order to ensure that these issues will not recur in any future clinical trials sponsored by us for any of our product candidates, we cannot assure you that the FDA will be satisfied with our response, that the FDA will not issue a warning letter or take other enforcement action against us, or that similar issues will not recur in the future. The results of this inspection may cause the FDA to disqualify some or all of the data from the FACT trial and not consider it in any future NDA for ZYBRESTAT, which could result in delays or difficulties in obtaining the regulatory approvals that will be required to market ZYBRESTAT. In addition, the steps we take to strengthen our procedures and conduct future clinical trials necessary for approval will be time-consuming and expensive, and we believe, but cannot assure you, that those steps will be sufficient to address the issues that were identified by the FDA in the Form FDA 483.

Our product candidates have not completed clinical trials, and may never demonstrate sufficient safety and efficacy in order to do so.

Our product candidates are in an early stage of development. In order to achieve profitable operations, we alone or in collaboration with others, must successfully develop, manufacture, introduce and market our products. The time frame necessary to achieve market success for any individual product is long and uncertain. The products currently under development by us will require significant additional research and development and extensive preclinical and clinical testing prior to application for commercial use. A number of companies in the biotechnology and pharmaceutical industries have suffered significant setbacks in clinical trials, even after showing promising results in early or later-stage studies or clinical trials. Although we have obtained some favorable results to-date in preclinical studies and clinical trials of certain of our potential products, such results may not be indicative of results that will ultimately be obtained in or throughout such clinical trials, and clinical trials may not show any of our

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products to be safe or capable of producing a desired result. Additionally, we may encounter problems in our clinical trials that will cause us to delay, suspend or terminate those clinical trials. Further, our research or product development efforts may not be successfully completed, any compounds currently under development by us may not be successfully developed into drugs, any potential products may not receive regulatory approval on a timely basis, if at all, and competitors may develop and bring to market products or technologies that render our potential products obsolete. If any of these problems occur, our business would be materially and adversely affected.

We have only a limited number of employees to manage and operate our business.

As announced on September 1, 2011, we have implemented a restructuring plan designed to focus our capital resources on our most promising early-stage clinical programs and further reduce our cash utilization. This restructuring plan involved a reduction in force of 11 full-time equivalent employees, or approximately 61%. As of March 9, 2012, we had a total of eight full-time employees and approximately three full-time equivalent employees working on a part-time basis. This reduction in force and focus on reducing cash utilization requires us to manage and operate our business in a highly efficient manner. We cannot assure you that we will be able to retain adequate staffing levels to run our operations and/or to accomplish all of the objectives that we otherwise would seek to accomplish.

We have a history of losses, and we anticipate that we will continue to incur losses in the future.

We have experienced net losses every year since our inception and, as of December 31, 2011, had an accumulated deficit of approximately $217,353,000. We anticipate continuing to incur substantial additional losses over at least the next several years due to, among other factors, the need to expend substantial amounts on our continuing clinical trials with respect to our VDA drug candidates, technologies, and anticipated research and development activities and the general and administrative expenses associated with those activities. We have not commercially introduced any product and our potential products are in varying early stages of development and testing. Our ability to attain profitability will depend upon our ability to develop products that are effective and commercially viable, to obtain regulatory approval for the manufacture and sale of our products and to license or otherwise market our products successfully. We may never achieve profitability, and even if we do, we may not be able to sustain being profitable.

We depend heavily on our executive officers, directors, and principal consultants and the loss of their services would materially harm our business.

We believe that our success depends, and will likely continue to depend, upon our ability to retain the services of our current executive officers, directors, principal consultants and others. The loss of the services of any of these individuals would have a material adverse effect on our business. In addition, we have established relationships with universities, hospitals and research institutions, which have historically provided, and continue to provide, us with access to research laboratories, clinical trials, facilities and patients. Additionally, we believe that we may, at any time and from time to time, materially depend on the services of consultants and other unaffiliated third parties. We cannot assure you that consultants and other unaffiliated third parties will provide the level of service to us that we require in order to achieve our business objectives.

Our industry is highly competitive, and our products may become technologically obsolete.

We are engaged in a rapidly evolving field. Competition from other pharmaceutical companies, biotechnology companies and research and academic institutions is intense and expected to increase. Many of those companies and institutions have substantially greater financial, technical and human resources than we do. Those companies and institutions also have substantially greater experience in developing products, in conducting clinical trials, in obtaining regulatory approval and in manufacturing and marketing pharmaceutical products. Our competitors may succeed in obtaining regulatory approval for their products more rapidly than we do. Competitors have developed or are in the process of developing technologies that are, or in the future may be, the basis for competitive products. We are aware of at least one other company that currently has a clinical-stage VDA for use in an oncology indication. Some of these competitive products may have an entirely different approach or means of accomplishing the desired therapeutic effect than products being developed by us. Our

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competitors may succeed in developing technologies and products that are more effective and/or cost competitive than those we are developing, or that would render our technology and products less competitive or even obsolete. In addition, one or more of our competitors may achieve product commercialization or patent protection earlier than we do, which could materially adversely affect us.

We have licensed in rights to ZYBRESTAT, OXi4503 and other programs from third parties. If our license agreements terminate or expire, we may lose the licensed rights to our product candidates, including ZYBRESTAT and OXi4503, and we may not be able to continue to develop them or, if they are approved, market or commercialize them.

We depend on license agreements with third parties for certain intellectual property rights relating to our product candidates, including patent rights. Currently, we have licensed in patent rights from Arizona State University, or ASU, and the Bristol-Myers Squibb Company for ZYBRESTAT and OXi4503 and from Baylor University for other programs. In general, our license agreements require us to make payments and satisfy performance obligations in order to keep these agreements in effect and retain our rights under them. These payment obligations can include upfront fees, maintenance fees, milestones, royalties, patent prosecution expenses, and other fees. These performance obligations typically include diligence obligations. If we fail to pay, be diligent or otherwise perform as required under our license agreements, we could lose the rights under the patents and other intellectual property rights covered by the agreements. While we are not currently aware of any dispute with any licensors under our material agreements with them, if disputes arise under any of our in-licenses, including our in-licenses from ASU and the Bristol-Myers Squibb Company, and Baylor University, we could lose our rights under these agreements. Any such disputes may or may not be resolvable on favorable terms, or at all. Whether or not any disputes of this kind are favorably resolved, our management’s time and attention and our other resources could be consumed by the need to attend to and seek to resolve these disputes and our business could be harmed by the emergence of such a dispute.

If we lose our rights under these agreements, we may not be able to conduct any further activities with the product candidate or program that the license covered. If this were to happen, we might not be able to develop our product candidates further, or following regulatory approval, if any, we might be prohibited from marketing or commercializing them. In particular, patents previously licensed to us might after termination be used to stop us from conducting these activities.

We depend extensively on our patents and proprietary technology, and we must protect those assets in order to preserve our business.

Although we expect to seek patent protection for any compounds we discover and/or for any specific use we discover for new or previously known compounds, any or all of them may not be subject to effective patent protection. Further, the development of regimens for the administration of pharmaceuticals, which generally involve specifications for the frequency, timing and amount of dosages, has been, and we believe, may continue to be, important to our effort, although those processes, as such, may not be patentable. In addition, the issued patents may be declared invalid or our competitors may find ways to avoid the claims in the patents.

Our success will depend, in part, on our ability to obtain patents, protect our trade secrets and operate without infringing on the proprietary rights of others. As of March 9, 2012, we were the exclusive licensee, sole assignee or co-assignee of twenty-eight (28) granted United States patents, sixteen (16) pending United States patent applications, two (2) pending Patent Cooperation Treaty international patent applications, and granted patents and/or pending applications in several other major markets, including the European Union, Canada and Japan. The patent position of pharmaceutical and biotechnology firms like us are generally highly uncertain and involves complex legal and factual questions, resulting in both an apparent inconsistency regarding the breadth of claims allowed in United States patents and general uncertainty as to their legal interpretation and enforceability. Accordingly, patent applications assigned or exclusively licensed to us may not result in patents being issued, any issued patents assigned or exclusively licensed to us may not provide us with competitive protection or may be challenged by others, and the current or future granted patents of others may have an adverse effect on our ability to do business and achieve profitability. Moreover, since some of the basic research relating to one or more of our patent applications and/or patents were performed at various universities and/or funded by grants,

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one or more universities, employees of such universities and/or grantors could assert that they have certain rights in such research and any resulting products. Further, others may independently develop similar products, may duplicate our products, or may design around our patent rights. In addition, as a result of the assertion of rights by a third party or otherwise, we may be required to obtain licenses to patents or other proprietary rights of others in or outside of the United States. Any licenses required under any such patents or proprietary rights may not be made available on terms acceptable to us, if at all. If we do not obtain such licenses, we could encounter delays in product market introductions while our attempts to design around such patents or could find that the development, manufacture or sale of products requiring such licenses is foreclosed. In addition, we could incur substantial costs in defending ourselves in suits brought against us or in connection with patents to which we hold licenses or in bringing suit to protect our own patents against infringement.

We require employees and the institutions that perform our preclinical and clinical trials to enter into confidentiality agreements with us. Those agreements provide that all confidential information developed or made known to the individual during the course of the relationship with us to be kept confidential and not to be disclosed to third parties, except in specific circumstances. Any such agreement may not provide meaningful protection for our trade secrets or other confidential information in the event of unauthorized use or disclosure of such information.

Our products may result in product liability exposure, and it is uncertain whether our insurance coverage will be sufficient to cover all claims.

The use of our product candidates in clinical trials and for commercial applications, if any, may expose us to liability claims, in the event such product candidates cause injury or disease, or result in adverse effects. These claims could be made directly by health care institutions, contract laboratories, patients or others using such products. Although we have obtained liability insurance coverage for our ongoing clinical trials, this coverage may not be in amounts sufficient to protect us from any product liability claims or product recalls which could have a material adverse effect on our financial condition and prospects. Further, adverse product and similar liability claims could negatively impact our ability to obtain or maintain regulatory approvals for our technology and product candidates under development.

If we do not obtain required regulatory approvals, we will be unable to market and sell our product candidates.

Our product candidates are subject to extensive governmental regulations relating to development, clinical trials, manufacturing, oversight of clinical investigators, recordkeeping and commercialization. Rigorous preclinical testing and clinical trials and an extensive regulatory review and approval process are required to be successfully completed in the United States and in many foreign jurisdictions before a new drug can be sold. Satisfaction of these and other regulatory requirements is costly, time consuming, uncertain, and subject to unanticipated delays. The time required to obtain approval by the FDA is unpredictable but typically exceeds five years following the commencement of clinical trials, depending upon the complexity of the product candidate.

We have limited experience in conducting and managing the clinical trials necessary to obtain regulatory approvals, including approval by the FDA. In connection with the clinical trials of our product candidates, we face risks that:

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Only a small percentage of product candidates for which clinical trials are initiated are the subject of NDAs and even fewer receive approval for commercialization. Furthermore, even if we do receive regulatory approval to market a product candidate, any such approval may be subject to limitations such as those on the indicated uses for which we may market the product.

If clinical trials for our product candidates are prolonged, delayed or suspended, we may be unable to commercialize our product candidates on a timely basis, which would require us to incur additional costs and delay our receipt of any revenue from potential product sales.

We cannot predict whether we will encounter problems with any of our completed, ongoing or planned clinical trials that will cause us or any regulatory authority to delay or suspend those clinical trials or delay the analysis of data derived from them. A number of events, including any of the following, could delay the completion of our other ongoing and planned clinical trials and negatively impact our ability to obtain regulatory approval for, and to market and sell, a particular product candidate:

Commercialization of our product candidates may be delayed by the imposition of additional conditions on our clinical trials by the FDA or any foreign regulatory authority or the requirement of additional supportive studies by the FDA or any foreign regulatory authority. In addition, clinical trials require sufficient patient enrollment, which is a function of many factors, including the size of the patient population, the nature of the trial protocol, the proximity of patients to clinical sites, the availability of effective treatments for the relevant disease, the conduct of other clinical trials that compete for the same patients as our clinical trials, and the eligibility criteria for our clinical trials. Our failure to enroll patients in our clinical trials could delay the completion of the clinical trial beyond our expectations. In addition, the FDA could require us to conduct clinical trials with a larger number of subjects than we have projected for any of our product candidates. We may not be able to enroll a sufficient number of patients in a timely or cost-effective manner. Furthermore, enrolled patients may drop out of our clinical trials, which could impair the validity or statistical significance of the clinical trials.

We do not know whether our clinical trials will begin as planned, will need to be restructured, or will be completed on schedule, if at all. Delays in our clinical trials will result in increased development costs for our product candidates, and our financial resources may be insufficient to fund any incremental costs. In addition, if our clinical trials are delayed, our competitors may be able to bring products to market before we do and the commercial viability of our product candidates could be limited.

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Our product candidates will remain subject to ongoing regulatory review even if they receive marketing approval, and if we fail to comply with continuing regulations, we could lose these approvals and the sale of any approved commercial products could be suspended.

Even if we receive regulatory approval to market a particular product candidate, the manufacturing, labeling, packaging, adverse event reporting, storage, advertising, promotion, and record keeping related to the product will remain subject to extensive regulatory requirements. If we fail to comply with the regulatory requirements of the FDA and other applicable domestic and foreign regulatory authorities or previously unknown problems with any approved product, manufacturer, or manufacturing process is discovered, we could be subject to administrative or judicially imposed sanctions, including:

If physicians and patients do not accept our future products or if the market for indications for which any product candidate is approved is smaller than expected, we may be unable to generate significant revenue, if any.

Even if any of our product candidates obtain regulatory approval, they may not gain market acceptance among physicians, patients, and third-party payers. Physicians may decide not to recommend our drugs for a variety of reasons including:

If any of our product candidates are approved, but fail to achieve market acceptance, we may not be able to generate significant revenue and our business would suffer.

We have no manufacturing capacity, and have relied and expect to continue to rely on third-party manufacturers to produce our product candidates.

We do not own or operate manufacturing facilities for the production of clinical or commercial quantities of our product candidates or any of the compounds that we are testing in our preclinical programs, and we lack the

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resources and the capabilities to do so. As a result, we currently rely, and we expect to rely in the future, on third-party manufacturers to supply our product candidates. Reliance on third-party manufacturers entails risks to which we would not be subject if we manufactured our product candidates or products ourselves, including:

If we do not maintain our developed important manufacturing relationships, we may fail to find replacement manufacturers or develop our own manufacturing capabilities which could delay or impair our ability to obtain regulatory approval for our products and substantially increase our costs or deplete profit margins, if any. If we do find replacement manufacturers, we may not be able to enter into agreements with them on terms and conditions favorable to us, and there could be a substantial delay before new facilities could be qualified and registered with the FDA and foreign regulatory authorities.

The FDA and foreign regulatory authorities require manufacturers to register manufacturing facilities. The FDA and corresponding foreign regulators also inspect these facilities to confirm compliance with current good manufacturing practices, or cGMPs. Contract manufacturers may face manufacturing or quality control problems causing drug substance production and shipment delays or a situation where the contractor may not be able to maintain compliance with the applicable cGMP requirements. Any failure to comply with cGMP requirements or other FDA and comparable foreign regulatory requirements could adversely affect our clinical research activities and our ability to develop our product candidates and market our products after approval.

Our current and anticipated future dependence upon others for the manufacture of our product candidates may adversely affect our future profit margins and our ability to develop our product candidates and commercialize any products that receive regulatory approval on a timely basis.

The uncertainty associated with pharmaceutical reimbursement and related matters may adversely affect our business.

Market acceptance and sales of any one or more of our product candidates that we develop will depend on reimbursement policies and may be affected by future healthcare reform measures. Government authorities and third-party payers, such as private health insurers and health maintenance organizations, decide which drugs they will cover and establish payment levels. We cannot be certain that reimbursement will be available for any product candidates that we develop. Also, we cannot be certain that reimbursement policies will not reduce the demand for, or the price paid for, our products. If reimbursement is not available or is available on a limited basis, we may not be able to successfully commercialize any product candidates that we develop.

In the United States, the Medicare Prescription Drug, Improvement, and Modernization Act of 2003, also called the Medicare Modernization Act, or MMA, changed the way Medicare covers and pays for pharmaceutical products. The legislation established Medicare Part D, which expanded Medicare coverage for outpatient prescription drug purchases by the elderly but provided authority for limiting the number of drugs that will be covered in any therapeutic class. The MMA also introduced a new reimbursement methodology based on average sales prices for physician-administered drugs.

The United States and several foreign jurisdictions are considering, or have already enacted, a number of legislative and regulatory proposals to change the healthcare system in ways that could affect our ability to sell our products profitably. Among policy makers and payers in the United States and elsewhere, there is significant interest in promoting changes in healthcare systems with the stated goals of containing healthcare costs, improving quality and/or expanding access to healthcare. In the United States, the pharmaceutical industry has been a particular focus of these efforts and has been significantly affected by major legislative initiatives. We

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expect to experience pricing pressures in connection with the sale of any products that we develop due to the trend toward managed healthcare, the increasing influence of health maintenance organizations and additional legislative proposals.

In March 2010, the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Affordability Reconciliation Act, or collectively, ACA, became law in the U.S. The goal of ACA is to reduce the cost of health care and substantially change the way health care is financed by both government and private insurers. While we cannot predict what impact on federal reimbursement policies this legislation will have in general or on our business specifically, the ACA may result in downward pressure on pharmaceutical reimbursement, which could negatively affect market acceptance of our product candidates. Members of the U.S. Congress and some state legislatures are seeking to overturn at least portions of the legislation, and we expect they will continue to review and assess this legislation and possibly alternative health care reform proposals. We cannot predict whether new proposals will be made or adopted, when they may be adopted or what impact they may have on us if they are adopted.

Our restated certificate of incorporation, our amended and restated by-laws, our stockholder rights agreement and Delaware law could deter a change of our management which could discourage or delay offers to acquire us.

Certain provisions of Delaware law and of our restated certificate of incorporation, as amended, and amended and restated by-laws could discourage or make it more difficult to accomplish a proxy contest or other change in our management or the acquisition of control by a holder of a substantial amount of our voting stock. It is possible that these provisions could make it more difficult to accomplish, or could deter, transactions that stockholders may otherwise consider to be in their best interests or the best interests of us. Further, the rights issued under the stockholder rights agreement would cause substantial dilution to a person or group that attempts to acquire us on terms not approved in advance by our Board of Directors.

The price of our common stock is volatile, and is likely to continue to fluctuate due to reasons beyond our control.

The market price of our common stock has been, and likely will continue to be, highly volatile. Factors, including our financial results or our competitors’ financial results, clinical trial and research development announcements and government regulatory action affecting our potential products in both the United States and foreign countries, have had, and may continue to have, a significant effect on our results of operations and on the market price of our common stock. We cannot assure you that your investment in our common stock will not fluctuate significantly. One or more of these factors could significantly harm our business and cause a decline in the price of our common stock in the public market. Substantially all of the shares of our common stock issuable upon exercise of outstanding options and warrants have been registered for resale or are available for sale pursuant to Rule 144 under the Securities Act of 1933, as amended, and may be sold from time to time. Such sales, as well as future sales of our common stock by existing stockholders, or the perception that sales may occur at any time, could adversely affect the market price of our common stock.

None.

OXiGENE’s corporate headquarters is located in South San Francisco, California where it leases approximately 12,000 square feet of general office space. The initial term of the lease expires on April 30, 2013. In addition, OXiGENE leases approximately 2,500 square feet of general office space located in Waltham, Massachusetts. The lease expires on May 31, 2012. The Company will not extend the lease of its Waltham office.

None.

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Not applicable

PART II

The Company’s common stock is traded on The NASDAQ Capital Market under the symbol “OXGN.” Prior to March 3, 2011, OXiGENE’s common stock was traded on The NASDAQ Global Market under the symbol “OXGN.” The following table sets forth the high and low sales price per share for our common stock on The NASDAQ Global Market and The NASDAQ Capital Market, as applicable, for each quarterly period during the two most recent fiscal years and subsequent interim periods.

In February 2011, the Company’s board of directors voted unanimously to implement a 1:20 reverse stock split of the Company’s common stock, following authorization of the reverse split by a shareholder vote on December 21, 2010. The reverse split became effective on February 22, 2011. All of the per share sales prices shown in the table below have been adjusted to reflect the effect of this reverse split.

On March 22, 2012, the closing price of the Company’s common stock on The NASDAQ Capital Market was $1.05 per share.

As of March 9, 2012, there were approximately 90 stockholders of record of the approximately 15,956,000 outstanding shares of the Company’s common stock. The Company believes, based on the number of proxy statements and related materials distributed in connection with its 2011 Special Meeting of Stockholders, that there are approximately 6,000 beneficial owners of its common stock.

The Company has not declared or paid any cash dividends on its common stock since its inception in 1988, and does not intend to pay cash dividends in the foreseeable future. The Company presently intends to retain future earnings, if any, to finance the growth and development of its business.

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SUMMARY FINANCIAL INFORMATION

The following table sets forth financial data with respect to the Company for each of the five years in the period ended December 31, 2011. The selected financial data for each of the five years in the period ended December 31, 2011 has been derived from the audited financial statements of the Company. The information below should be read in conjunction with the financial statements (and notes thereto) and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” included in Item 7 of this Annual Report on Form 10-K.

In February 2011, the Company’s board of directors voted unanimously to implement a 1:20 reverse stock split of the Company’s common stock, following authorization of the reverse split by a shareholder vote on December 21, 2010. The reverse split became effective on February 22, 2011. All of the share and per share amounts discussed and shown in the statements and tables below have been adjusted to reflect the effect of this reverse split.

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Our management’s discussion and analysis of financial condition contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements involve known and unknown risks and uncertainties that may cause our actual results or outcomes to be materially different from those anticipated and discussed herein. Important factors that we believe may cause such differences are discussed in the “Risk Factors” section of this Annual Report and in the cautionary statements accompanying the forward-looking statements in this Annual Report. In assessing forward-looking statements contained herein, readers are urged to read carefully all Risk Factors and cautionary statements contained in this Annual Report. Further, we operate in an industry sector where securities values are volatile and may be influenced by regulatory and other factors beyond our control.

OVERVIEW

We are a clinical-stage, biopharmaceutical company developing novel therapeutics primarily to treat cancer. Our primary focus is the development of product candidates referred to as vascular disrupting agents, or VDAs, that selectively disable and destroy abnormal blood vessels that provide solid tumors a means of growth and survival and also are associated with visual impairment in a number of ophthalmological diseases and conditions.

The Orphan Drug Act was passed in January 1983 to stimulate the research, development, and approval of products that treat rare diseases. An orphan drug is defined as a product that treats a rare disease affecting fewer than 200,000 patients in the United States. Drugs are granted orphan status for a specific indication.

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To date, more than 400 subjects have been treated with ZYBRESTAT in human clinical trials, and the drug candidate has generally been observed to be well-tolerated.

ZYBRESTAT for Oncology

ZYBRESTAT is a reversible tubulin binding agent that works by disrupting the network of blood vessels, or vasculature, within solid tumors, also referred to as vascular disruption. Vascular disruption leads to tumor hypoxia, which refers to the process of starving the tumor of vitally necessary oxygen supply and subsequent tumor cell death. More specifically, ZYBRESTAT selectively targets the existing abnormal and largely immature vasculature found specifically in most solid tumors and causes endothelial cells that make up the walls of the blood vessels in that vasculature to lose their normally flat shape and to become round, thus blocking the flow of blood to the tumor. The downstream tumor environment is then deprived of oxygen and nutrients, and the resulting restriction in blood supply kills the cells in the central portion of the tumor. Based on ZYBRESTAT’s positive activity observed in animal models, we have conducted multiple clinical trials of ZYBRESTAT in a variety of tumor types.

Our top priority is to pursue the clinical development of ZYBRESTAT in ATC. ATC is a very aggressive, rare but lethal cancer of the thyroid gland. Because of the rapid progression of the disease and the absence of effective therapies, median survival from the time of diagnosis is approximately 3-4 months. We have completed a Phase 2/3 clinical trial of ZYBRESTAT in patients with ATC, and we are currently planning a pivotal Phase 3 clinical trial of ZYBRESTAT in ATC, which we refer to as the FACT 2 trial. We believe that the FACT 2 trial represents a critical opportunity to demonstrate the value of our key asset, ZYBRESTAT, and has the potential to create significant value for our company and our shareholders. As such, our primary corporate strategy for 2012 is to secure sufficient funding to conduct the trial. We also intend to pursue a special protocol assessment (SPA) for this program with the FDA, with the goal of laying the foundation for initiation of this global registration study. We believe completion of the FACT2 study, assuming continued positive clinical results, will be sufficient to obtain FDA approval and approval in Europe for the treatment of patients with advanced ATC.

Possible areas for future development

ATC and ovarian cancer, and potentially other orphan indications, represent areas for further development and significant unmet medical needs, and thus significant potential commercial market opportunities.

Further development of our ongoing clinical trials will depend on continuing analysis and results of ongoing clinical studies, as well as available financial resources and/or potential partnering activities.

OXi4503, a unique, second generation VDA for oncology indications

We are currently pursuing development of OXi4503, a second-generation, dual-mechanism VDA, as a treatment for certain solid tumor types and for the treatment of myeloid leukemias, which also represent orphan indications. We believe that OXi4503 is differentiated from other VDAs by its dual-action activity: in addition to having potent vascular disrupting effects, OXi4503 is unique in that certain enzymes in the human body can help convert it to a form of chemical that has direct tumor cell killing effects. We believe this unique property may result in enhanced anti-tumor activity in certain tumor types as compared with other VDA drug candidates. Based on data from preclinical studies, we believe that OXi4503 may have enhanced activity in tumor types with relatively high levels of the enzymes that facilitate the conversion of OXi4503 to the form of chemical that kills tumor cells. These tumor types include hepatocellular carcinoma, melanoma, and leukemias of the myeloid lineage. In preclinical studies, OXi4503 has shown potent anti-tumor activity against solid tumors and acute myeloid leukemia models, both as a single agent and in combination with other cancer treatment modalities.

Based on the results of preclinical studies published in the journal Blood in September 2010 that show OXi4503 has potent activity against acute myelogenous leukemia (AML) in animal models, we entered into a clinical trial agreement pursuant to which investigators at the University of Florida initiated an investigator sponsored Phase 1 study of OXi4503 in patients with AML or myelodysplastic syndrome (MDS) in May 2011. This open-label, dose-escalating study for the treatment of up to 36 patients is being conducted in patients with relapsed or refractory AML and MDS and will evaluate the safety profile, maximum tolerated dose and biologic activity of OXi4503 in these patients. We expect that initial indications of biologic activity from this study may be available in the fourth quarter of 2012.

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The general direction of future development of OXi4503 for hematologic indications will depend on the outcome of the analysis of the study in AML, as well as available financial resources and potential partnering activities.

ZYBRESTAT for Ophthalmology

In addition to developing ZYBRESTAT as an intravenously administered therapy for oncology indications, we have previously undertaken an ophthalmology research and development program with ZYBRESTAT with the ultimate goal of developing a topical formulation of ZYBRESTAT for ophthalmological diseases and conditions that are characterized by abnormal blood vessel growth within the eye that result in loss of vision. Due to financial constraints, we are not actively pursuing development in this area at this time.

We believe that a safe, effective and convenient topically-administered anti-vascular therapeutic would have advantages over currently approved anti-vascular, ophthalmological therapeutics, many of which must be injected directly into patients’ eyes, in some cases on a chronic monthly basis.

We have also evaluated the requirements for additional preclinical toxicology and efficacy studies with ZYBRESTAT for topical ophthalmological formulations to better position the program for partnering. Further development of this program will depend on the outcome of our evaluation of these requirements and available financial resources.

Financial Resources

We have experienced net losses every year since our inception and, as of December 31, 2011, had an accumulated deficit of approximately $217,353,000. We expect to incur significant additional operating losses over at least the next several years, principally as a result of our continuing clinical trials and anticipated research and development expenditures. The principal source of our working capital to date has been the proceeds of private and public equity financings and to a lesser extent the exercise of warrants and stock options. We currently have no recurring material amount of licensing or other income. As of December 31, 2011, we had approximately $9,992,000 in cash, restricted cash and cash equivalents.

On July 21, 2010, we entered into an “at the market” (ATM) equity offering sales agreement with McNicoll, Lewis & Vlak LLC, (MLV), pursuant to which we may issue and sell shares of our common stock from time to time through MLV acting as our sales agent and underwriter. Sales of our common stock through MLV are made on the principal trading market of our common stock by means of ordinary brokers’ transactions at market prices, in block transactions or as otherwise agreed by MLV and us. MLV uses its commercially reasonable efforts to sell our common stock from time to time, based upon our instructions including any price, time or size limits we may impose. We pay MLV a commission rate of up to 7.0% of the gross sales price per share of any common stock sold through MLV as agent under the sales agreement. During our fiscal year 2011, we sold approximately 7,794,000 shares of our common stock using this arrangement for net proceeds of approximately $17,146,000. Currently, we are not able to sell additional shares under this ATM due to SEC limitations on the number of shares issuable pursuant to a Form S-3 registration statement in a primary offering by smaller reporting companies such as us. We expect to be able to resume such sales in the second half of 2012, should we meet the issuance criteria of the SEC and NASDAQ.

On September 1, 2011, we announced a restructuring plan, which included employee terminations, designed to focus our capital resources on our most promising early-stage clinical programs and further reduce our cash utilization. We announced the following key aspects of the restructuring and their effects on our operations including current and planned clinical trials:

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We offered severance benefits to the terminated employees, and have recorded a total charge of approximately $1,226,000, primarily associated with personnel-related termination costs. In order to provide for an orderly transition, we implemented the reduction in work force in a phased manner. Substantially all of the charge represents cash expenditures. Upon completion of the restructuring activities outlined above, we expect to reduce expenses from fiscal 2011 levels by an annual amount of approximately $2,000,000. Our ability to achieve this anticipated cost reduction is contingent upon only continuing to conduct the projects for which we are currently committed. Based on this planned level of cash utilization, we will be unable to significantly advance our more developed candidates, including ZYBRESTAT in ATC.

In November 2011, we entered into a purchase agreement for the sale, from time to time, of up to $20,000,000 of our common stock with Lincoln Park Capital Fund, LLC (LPC), a Chicago-based institutional investor. The proceeds from any sales under this purchase agreement will be used to further develop our late and early-stage clinical pipeline and to fund our ongoing operations. During the 36-month term of the purchase agreement, we control the timing and amount of any sales to LPC, if and when we decide, in accordance with the purchase agreement. LPC has no right to require us to sell any shares to LPC, but LPC is obligated to make purchases as we direct, subject to certain conditions, which include the continuing effectiveness of a registration statement filed with the Securities and Exchange Commission covering the resale of the shares that may be issued to LPC and limitations related to the market value of our common stock. There is no guarantee that funding from LPC will be available when needed, or at all, or that the Company will be able to maintain effectiveness of the aforementioned registration statement. There are no upper limits to the price LPC may pay to purchase our common stock and the purchase price of the shares related to any future sales will be based on the prevailing market prices of our shares immediately preceding the notice of sale to LPC without any fixed discount. The agreement may be terminated by us at any time, at our sole discretion, without any cost or penalty. No amounts were received under this facility during 2011.

In December 2011, we established a partnership agreement with Azanta Danmark A/S, or Azanta, to provide access to ZYBRESTAT for the treatment of patients in a specified territory with ATC on a compassionate use basis. Our newly-formed Named Patient Program to be managed by Azanta, provides a regulatory mechanism to allow healthcare professionals in Europe and Canada to prescribe ZYBRESTAT to individual ATC patients while it is still in development. Under the terms of the agreement, we will provide ZYBRESTAT to Azanta. Azanta will serve as exclusive distributor for ZYBRESTAT in the specified territory for this purpose and will provide ZYBRESTAT to physicians solely to treat ATC on a compassionate use basis in

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the territory covered by the agreement until such time as ZYBRESTAT may obtain marketing approval in that territory. The territory includes the European Union, including the Nordic countries and Switzerland, and Canada, and the agreement may also be expanded to include other countries on a country-by-country basis. We and Azanta will cooperate on regulatory activities relating to ZYBRESTAT for the treatment of ATC within the territory. There will be no transfer of ownership of intellectual property rights for ZYBRESTAT to Azanta under the terms of the agreement. We do not expect to receive significant income from Azanta under this arrangement. No revenue was recognized nor was any cash received under this agreement during 2011.

Based on our limited ongoing programs and operations and taking into consideration the expected reductions in cash utilization resulting from our September 2011 reduction in force, we expect our existing cash and cash equivalents to support our operations through the first quarter of 2013. However, this level of cash utilization does not provide for the initiation of any significant projects to further the development of our most advanced product candidates, primarily ZYBRESTAT in ATC. Any significant further development of ZYBRESTAT or other capital intensive activities will be contingent upon our ability to raise additional capital in addition to our existing financing arrangements.

We will require significant additional funding to fund operations and to continue the development of our product candidates. Such funding may not be available to us on acceptable terms, or at all. If we are unable to access additional funds when needed, we may not be able to continue the development of our product candidates or we could be required to delay, scale back or eliminate some or all of our development programs and other operations. Any additional equity financing, which may not be available to us or may not be available on favorable terms, most likely will be dilutive to our current stockholders and debt financing, if available, may involve restrictive covenants. If we access funds through collaborative or licensing arrangements, we may be required to relinquish rights to some of our technologies or product candidates that we would otherwise seek to develop or commercialize on our own, on terms that are not favorable to us. Our ability to access capital when needed is not assured and, if not achieved on a timely basis, will materially harm our business, financial condition and results of operations.

We are committed to a disciplined financial strategy and as such maintain a limited employee and facilities base, with development, scientific, finance and administrative functions, which include, among other things, product development, regulatory oversight and clinical testing. Our research and development team members typically work on a number of development projects concurrently. Accordingly, we do not separately track the costs for each of these research and development projects to enable separate disclosure of these costs on a project-by-project basis. We conduct scientific activities pursuant to collaborative arrangements with universities. Regulatory and clinical testing functions are generally contracted out to third-party, specialty organizations.

Critical Accounting Policies and Significant Judgments and Estimates

Our management’s discussion and analysis of our financial condition and results of operations is based on our financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles. The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported revenues and expenses during the reporting periods. On an ongoing basis, we evaluate our estimates and judgments, including those related to intangible assets. We base our estimates on historical experience and on various other factors that are believed to be appropriate under the circumstances, the results of which form the basis for making the judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates.

While our significant accounting policies are more fully described in Note 1 to our financial statements included in this report, we believe the following accounting policies are most critical to aid in fully understanding and evaluating our reported financial results.

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates.

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Concentration of Credit Risk

We have no significant off balance sheet concentrations of credit risk. Financial instruments that potentially subject us to concentrations of credit risk primarily consist of cash and cash equivalents. We hold our cash and cash equivalents at one financial institution.

Cash, Restricted Cash and Cash Equivalents

We consider all highly liquid financial instruments with maturities of three months or less when purchased to be cash equivalents. We have $20,000 that is used to secure financing through a Company credit card. This amount is separated from cash and cash equivalents on the Balance Sheet.

Accrued Research and Development

We charge all research and development expenses, both internal and external costs, to operations as incurred. Our research and development costs represent expenses incurred from the engagement of outside professional service organizations, product manufacturers and consultants associated with the development of our potential product candidates. We recognize expense associated with these arrangements based on the completion of activities as specified in the applicable contracts. Costs incurred under fixed fee contracts are accrued ratably over the contract period absent any knowledge that the services will be performed other than ratably. Costs incurred under contracts with clinical trial sites and principal investigators are generally accrued on a patients-treated basis consistent with the terms outlined in the contract. In determining costs incurred on some of these programs, we take into consideration a number of factors, including estimates and input provided by our internal program managers. Upon termination of such contracts, we are normally only liable for costs incurred or committed to date. As a result, accrued research and development expenses represent our estimated contractual liability to outside service providers at any of the relevant times. Any advance payments for goods or services to be used or rendered in future research and development activities pursuant to an executory contractual arrangement are properly classified as prepaid until such goods or services are rendered.

License Agreements

On August 2, 1999, we entered into an exclusive license for the commercial development, use and sale of products or services covered by certain patent rights owned by Arizona State University. The present value of the amount payable under the license agreement has been capitalized based on a discounted cash flow model and is being amortized over the term of the agreement (approximately 15.5 years). Management is required to perform an impairment analysis of its long-lived assets if triggering events occur. We review for such triggering events, including triggering events such as a going concern opinion and continuing operating losses, periodically. In addition, the agreement provides for additional payments in connection with the license arrangement upon the initiation of certain clinical trials or the completion of certain regulatory approvals, which payments could be accelerated upon the achievement of certain financial milestones as defined in the agreement. We expense these payments to research and development in the period that payment becomes both probable and estimable.

Share-based compensation

We record the expense recognition of the estimated fair value of all share-based payments issued to employees. The valuation of employee stock options is an inherently subjective process, since market values are generally not available for long-term, non-transferable employee stock options. Accordingly, an option pricing model is utilized to derive an estimated fair value. In calculating the estimated fair value of our stock options, we used the Black-Scholes option pricing model which requires the consideration of the following six variables for purposes of estimating fair value:

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Stock Option Exercise Price and Grant Date Price of our common stock — The closing market price of our common stock on the date of grant.

Expected Term — The expected term of options represents the period of time for which the options are expected to be outstanding and is based on an analysis of historical behavior of participants over time.

Expected Volatility — The expected volatility is a measure of the amount by which our stock price is expected to fluctuate during the term of the option granted. We determine the expected volatility based on the historical volatility of our common stock over a period commensurate with the option’s expected term.

Expected Dividends — Because we have never declared or paid any cash dividends on any of our common stock and do not expect to do so in the foreseeable future, we use an expected dividend yield of zero to calculate the grant date fair value of a stock option.

Risk-Free Interest Rate — The risk-free interest rate is the implied yield available on U.S. Treasury issues with a remaining life consistent with the option’s expected term on the date of grant.

Of the variables above, the selection of an expected term and expected stock price volatility are the most subjective.

We are required to estimate the level of award forfeitures expected to occur and record compensation expense only for those awards that are ultimately expected to vest. Accordingly, we perform a historical analysis of option awards that are forfeited prior to vesting, and record total stock option expense that reflects this estimated forfeiture rate. We segregate participants into two distinct groups, (1) directors and officers and (2) employees, and apply the estimated forfeiture rates using the Straight Line (Uniform) method to record expense. This analysis is re-evaluated quarterly and the forfeiture rate adjusted as necessary.

Symphony Transaction

In October 2008, we announced a strategic collaboration with Symphony Capital Partners, L.P. (Symphony), a private-equity firm, under which Symphony agreed to provide up to $40,000,000 in funding to support the advancement of ZYBRESTAT for oncology, ZYBRESTAT for ophthalmology and OXi4503. In connection with the collaboration, we granted Symphony ViDA, Inc., a newly-created drug development company, exclusive licenses to ZYBRESTAT for use in ophthalmologic indications and OXi4503.

Under the collaboration, we entered into a series of related agreements with Symphony Capital LLC, Symphony ViDA, Symphony ViDA Holdings LLC (Holdings) and related entities, including a Purchase Option Agreement, a Research and Development Agreement, a Technology License Agreement and an Additional Funding Agreement. In addition, we entered into a series of related agreements with Holdings, including a Stock and Warrant Purchase Agreement and a Registration Rights Agreement.

Pursuant to these agreements, Holdings formed and capitalized Symphony ViDA in order (a) to hold certain intellectual property related to the programs which were exclusively licensed to Symphony ViDA under the Technology License Agreement and (b) to fund commitments of up to $25,000,000. The funding was intended to support preclinical and clinical development by us, on behalf of Symphony ViDA, of the programs.

We issued to Holdings, pursuant to the Stock and Warrant Purchase Agreement, an aggregate of 675,675 shares of our common stock and warrants at a price of $22.20 per share, which was the closing price of our common stock on September 30, 2008, the day before we entered into the Symphony transaction. In addition, pursuant to the Purchase Option Agreement, we issued to Holdings an aggregate of 180,180 shares of our common stock with a fair value of $4,000,000 as consideration for the Purchase Option.

On July 2, 2009, we, Holdings and Symphony ViDA entered into a series of related agreements pursuant to which we exercised the Purchase Option under terms set forth in an amended and restated purchase option agreement (the Amended Purchase Option Agreement), and we and Holdings also entered into an amended and restated registration rights agreement.

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We closed on the amended Purchase Option on July 20, 2009 and issued 500,000 shares of our common stock to Holdings at the closing in exchange for all of the equity of Symphony ViDA. In addition, upon the closing of the Purchase Option, we re-acquired all of the rights to the programs, and the approximately $12,400,000 in cash held by Symphony ViDA at the time of the closing became available for use for general corporate purposes.

Consolidation of Variable Interest Entity (VIE)

A variable interest entity (VIE) is (1) an entity that has equity that is insufficient to permit the entity to finance its activities without additional subordinated financial support, or (2) an entity that has equity investors that cannot make significant decisions about the entity’s operations or that do not absorb their proportionate share of the expected losses or do not receive the expected residual returns of the entity. A VIE should be consolidated by the party that is deemed to be the primary beneficiary, which is the party that has exposure to a majority of the potential variability in the VIE’s outcomes. The application of accounting policy to a given arrangement requires significant management judgment.

We consolidated the financial position and results of operations of Symphony ViDA, Inc. (“ViDA”) from October 2008, when it entered into a strategic collaboration with Symphony ViDA Holdings, LLC (“Symphony”), until July 20, 2009 when we acquired 100% of ViDA pursuant to the Amended Purchase Option Agreement. We believe ViDA was by design a VIE because we had a purchase option to acquire its outstanding voting stock at prices that are fixed based upon the date the option is exercised. The fixed nature of the purchase option price limited Symphony ViDA Holding’s returns, as the investor in ViDA. Further, due to the direct investment from Holdings in our common stock, as a related party ViDA was a VIE of which we were the primary beneficiary. After we exercised the purchase option, ViDA became a wholly-owned subsidiary of ours and ceased being a VIE.

Accounting and Reporting of Noncontrolling Interests

On January 1, 2009, we adopted (retrospectively for all periods presented) the new presentation requirements for noncontrolling interests required by ASC 810, Consolidations. Under ASC 810, earnings or losses attributed to the noncontrolling interests are reported as part of consolidated earnings and not as a separate component of income or expense. Accordingly, we reported the consolidated earnings of ViDA in its consolidated statement of operations from October 2008, when we entered into a strategic collaboration with Symphony, until July 20, 2009, when we acquired 100% of the equity of ViDA pursuant to the Amended Purchase Option Agreement. Once becoming our wholly-owned subsidiary, the operating results of ViDA continued to be included in our consolidated statement of operations but were no longer subject to the presentation requirements applicable to noncontrolling interests. Losses incurred by ViDA, and attributable to Symphony, were charged to noncontrolling interest.

Accounting for Derivative Financial Instruments Indexed to and Potentially Settled in the Company’s Common stock

We evaluate all derivative financial instruments issued in connection with our equity offerings when determining the proper accounting treatment for such instruments in the Company’s financial statements. The Company considers a number of generally accepted accounting principles to determine such treatment. The Company performs a number of steps to evaluate the features of the instrument against the guidance provided in the accounting pronouncements in order to determine the appropriate accounting treatment. The Company’s policy with regard to settling outstanding financial instruments is to settle those with the earliest maturity date first which essentially sets the order of preference for settling the awards. In the majority of circumstances, we utilize the Black Scholes method to determine the fair value of our derivative financial instruments. In some cases, where appropriate, we utilize the Binomial method to determine the fair value of such derivative financial instruments. Key valuation factors in determining the fair value include the current stock price as of the date of measurement, the exercise price, the remaining contractual life, expected volatility for the instrument and the risk-free interest rate. Changes in fair value are recorded as a gain or loss in our Statement of Operations with the corresponding amount recorded as an adjustment to the liability on our Balance Sheet. The expected volatility factor, in particular, is subject to significant variability from measurement period to measurement period and can result in large gains or losses from period to period.

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Revenue Recognition

In December 2011, we established a partnership agreement with Azanta Danmark A/S, or Azanta, to provide access to ZYBRESTAT for the treatment of patients in a specified territory with ATC on a compassionate use basis. Our newly-formed Named Patient Program to be managed by Azanta, provides a regulatory mechanism to allow healthcare professionals in Europe and Canada to prescribe ZYBRESTAT to individual ATC patients while it is still in development. Our agreement with Azanta provides that upon the receipt of ZYBRESTAT by Azanta for distribution and sale to compassionate use patients, Azanta has 30 days to inspect the product for defects and to ensure that the product conforms to the warranties made by us. If Azanta does not notify us of any defective product within the 30-day period it will be deemed to have accepted the product. Revenue is recognized based on product accepted at the conclusion of the 30-day inspection period. Also, Azanta will pay to us, on a quarterly basis, an amount equal to 20% of Azanta’s gross margin, as defined in the agreement, on its sales in the preceding quarter. This revenue will be recognized upon notification from Azanta of the gross margin earned.

In addition, we licensed to a third party our formerly owned Nicoplex and Thiol Test technology. Revenue in connection with this license arrangement is earned based on sales of products or services utilizing this technology. Revenue is recognized under this agreement when payments are received due to the uncertainty of the timing of sales of products or services.

RESULTS OF OPERATIONS

Years ended December 31, 2011 and 2010

Revenues

We did not recognize any license revenue in the years ended December 31, 2011 and 2010. Future revenues, if any, from license agreements are expected to be minimal. In addition, we did not recognize any product revenue in the fiscal year ended December 31, 2011 in connection with our distribution agreement with Azanta as no product had been accepted by Azanta as of December 31, 2011.

Our future revenues will depend upon our ability to establish collaborations with respect to, and generate revenues from products currently under development by us. We expect that we will not generate meaningful revenue unless and until we enter into new collaborations providing for funding through the payment of licensing fees and up-front payments.

Costs and Expenses

The following table summarizes our operating expenses for the periods indicated, in thousands and as a percentage of total expenses:

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Research and development expenses

The table below summarizes the most significant components of our research and development expenses for the periods indicated, in thousands and as a percentage of total research and development expenses and provides the changes in these components and their percentages:

The reduction in external services expenses for the fiscal year ended December 31, 2011 compared to the same twelve month period in 2010 is primarily attributable to a reduction in spending on all of our clinical projects for the comparable periods with the majority of the reduction coming from our ZYBRESTAT for oncology program, most prominently our anaplastic thyroid cancer and non-small cell lung cancer projects. These two major studies have been progressing to conclusion over the last 12 to 18 months. In addition, we experienced reductions in expenses on our OXi4503 and ZYBRESTAT for ophthalmology programs for the comparable 2011 period, primarily related to our decision in February 2010 to scale back efforts on some of our projects in these areas.

The reduction in employee compensation and related expenses for the twelve month period ended December 31, 2011 compared to the same twelve month period of 2010 is due to reductions in our clinical project expenses noted above. In February 2010 and again in September 2011, we implemented a Company wide restructuring plan due to our decision to scale back activities in some of our ongoing clinical projects.

The reduction in other expenses for the twelve month period ended December 31, 2011 compared to the same twelve month period of 2010 is primarily due to a reduction in both our research and development facility related costs as well as program wide support costs for the comparable periods.

General and administrative expenses

The table below summarizes the most significant components of our general and administrative expenses for the periods indicated, in thousands and as a percentage of total general and administrative expenses and provides the changes in these components and their percentages:

The reduction in employee compensation and related expenses for the twelve month period ended December 31, 2011 compared to the same twelve month period of 2010 is due to a reduction in our average full time equivalents for the comparable periods. In February 2010 and again in September 2011, we implemented a Company wide restructuring plan due to our decision to scale back activities in some of our ongoing clinical projects.

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The reduction in consulting and professional services expenses for the twelve month period ended December 31, 2011 compared to the same twelve month period of 2010 is primarily due to one time costs incurred in 2010 in connection with both our attempt to acquire Vaxgen Inc. and to a PIPE financing transaction that did not recur in the 2011 period. In addition, we experienced lower board member compensation expense attributable to lower stock valuations during the first half of the 2011 period as a portion of fees to board members are paid in the form of non-cash stock awards. Also, we recognized lower legal, accounting and service provider expenses due to fewer significant transactions during the 2011 period.

Restructuring Plan

On September 1, 2011, we announced a restructuring plan, which included employee terminations, designed to focus our capital resources on our most promising early-stage clinical programs and further reduce our cash utilization. We announced the following key aspects of the restructuring and their effects on our operations including current and planned clinical trials:

We offered severance benefits to the terminated employees, and have recorded a total charge of approximately $1,226,000, primarily associated with personnel-related termination costs. In order to provide for an orderly transition, we implemented the reduction in work force in a phased manner. Substantially all of the charge represents cash expenditures. Upon completion of the restructuring activities outlined above, we expect to reduce expenses from fiscal 2011 levels by an annual amount of approximately $2,000,000. Our ability to achieve this anticipated cost reduction is contingent upon only continuing to conduct the projects for which we are currently committed.

On February 11, 2010, we announced a restructuring plan designed to focus resources on our highest-value clinical assets and reduce our cash utilization. Key aspects of the 2010 restructuring were as follows:

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Other Income and Expenses

The table below summarizes Other Income and Expense in our Income Statement for the years 2011 and 2010, in thousands.

We recorded a non-cash gain in the 2011 twelve month period and a non-cash loss in the 2010 twelve month period as a result of changes in the estimated Fair Market Value of our common stock warrants issued in connection with the offerings as discussed in the Warrants section of Note 6 to the financial statements.

The Other income amounts are generally derived from net gains on foreign currency exchange. Also included in the fiscal 2010 amount is our receipt of $733,000 in connection with qualified investments in a qualifying therapeutic discovery project under section 48D of the Internal Revenue Code in November 2010.

The table below summarizes the components of the change in fair value of warrants for the twelve month periods ended December 31, 2011 and December 31, 2010, in thousands.

Tax Matters

At December 31, 2011, the Company had a net operating loss carry-forward of approximately $71,405,000 for U.S. income tax purposes, which began to expire for U.S. purposes during 2011. Due to the degree of uncertainty related to the ultimate use of these loss carry-forwards, we have fully reserved this future benefit. Additionally, the future utilization of the U.S. net operating loss carry-forwards is subject to limitations under the change in stock ownership rules of the Internal Revenue Service. The valuation allowance decreased by approximately $2,854,000 and increased by approximately $5,640,000 for the years ended December 31, 2011 and 2010, respectively, due primarily to changes in net operating loss carry-forwards.

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Years ended December 31, 2010 and 2009

Revenues

We did not recognize any license revenue in the years ended December 31, 2010 and 2009, in connection with the license of our nutritional and diagnostic technology or otherwise. Future revenues, if any, from this license agreement are expected to be minimal.

Our future revenues will depend upon our ability to establish collaborations with respect to, and generate revenues from products currently under development by us. We expect that we will not generate meaningful revenue unless and until we enter into new collaborations providing for funding through the payment of licensing fees and up-front payments.

Costs and Expenses

The following table summarizes our operating expenses for the periods indicated, in thousands and as a percentage of total expenses:

Research and development expenses

The table below summarizes the most significant components of our research and development expenses for the periods indicated, in thousands and as a percentage of total research and development expenses and provides the changes in these components and their percentages:

The reduction in external services expenses for the year ended December 31, 2010 compared to the same twelve month period in 2009 is primarily attributable to a reduction in spending on our ZYBRESTAT for Oncology program of approximately $3,300,000. This reduction is primarily attributable to lower costs on our ATC study for the comparable 2010 period in connection with our decision to discontinue further recruitment of patients on this study in February 2010. In addition, we experienced reductions in expenses on both our OXi4503 and ZYBRESTAT for Ophthalmology programs for the comparable 2010 period, primarily related to our decision in February 2010 to scale back efforts in some of our projects in these areas as well.

The reduction in employee compensation and related expenses for the year ended December 31, 2010 compared to the same twelve month period of 2009 is due to a 50% reduction in our average full time equivalents for the comparable 2010 period. In February 2010 we implemented a Company-wide restructuring plan due to our decision to scale back activities in some of our ongoing clinical projects.

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The reduction in other expenses for the year ended December 31, 2010 compared to the same twelve month period of 2009 is primarily due to a reduction in both our research and development facility related costs as well as program wide support costs for the comparable 2010 period.

General and administrative expenses

The table below summarizes the most significant components of our general and administrative expenses for the periods indicated, in thousands and as a percentage of total general and administrative expenses and provides the changes in these components and their percentages: