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FDA Approves Special Protocol Assessment for Phase 3 Trial of Polaris Group's Cancer Therapeutic, ADI-PEG 20, in the Treatment of Hepatocellular Carcinoma

Polaris Set to Advance Novel Therapeutic Targeting Cancer Metabolism to Pivotal Studies


News provided by

Polaris Group

Mar 31, 2011, 08:00 ET

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SAN DIEGO, March 31, 2011 /PRNewswire/ -- Polaris Group (Polaris) today announced that the U.S. Food & Drug Administration (FDA) has approved the company's Special Protocol Assessment (SPA) for a Phase 3 clinical trial of pegylated arginine deiminase (ADI-PEG 20) in patients with advanced hepatocellular carcinoma (HCC). The randomized, placebo-controlled, global trial will enroll approximately 600 patients who have failed prior systemic chemotherapy. The primary endpoint of the study is overall survival.

Ghassan Abou-Alfa, M.D., of Memorial Sloan-Kettering Cancer Center in New York, is the principal investigator of the study.  

"ADI-PEG 20 has demonstrated medical benefit in prior studies in multiple indications with a remarkable safety profile," said Dr. Abou-Alfa. "I am delighted to lead this study to explore ADI-PEG 20 as a viable option for patients with advanced liver malignancies."

SPA is a mechanism that allows the FDA and drug developers to reach an agreement prior to study initiation about the design and size of a Phase 3 trial. It will form the primary basis of an efficacy claim in a marketing application.

"The SPA agreement with the FDA is a key step in our plans for the clinical development of ADI-PEG 20," said John Bomalaski, M.D., executive vice president, medical affairs, of Polaris. "We are pleased to move ADI-PEG 20 into a pivotal Phase 3 trial and to be working with such well-established hepatocellular carcinoma experts."

Leo Chen, M.D., the lead investigator of the Phase 2 HCC study in Taiwan, stated, "Our Phase 2 study demonstrated that ADI-PEG 20 was effective and well-tolerated in patients with advanced liver cancer, and we look forward to the opportunity to further assess the efficacy and safety of this drug in a large randomized Phase 3 study."

The lead investigator in China, Shukui Qin, M.D., president of the Chinese Society of Clinical Oncology and chair of the Chinese Liver Cancer Study Group, added, "Approximately half of the liver cancer-related deaths in the world are in China. We have been watching the development of this drug, and we are excited to become an active participant in this pivotal global study."

ADI-PEG 20 is a biologic being developed to treat cancers carrying a major metabolic defect that renders them, unlike normal cells, unable to make arginine internally. Because arginine is one of the 20 amino acids that are essential for protein synthesis and survival of cells, these cells become dependent upon the external supply of arginine to survive and grow. ADI-PEG 20 works by systemically depleting the external supply of arginine and causes these arginine-dependent cancer cells to die while leaving the normal cells unharmed.

In addition to HCC, multiple other cancers have been reported to have a high degree of arginine-dependency. Early-to-mid-stage clinical trials have yielded positive results in patients with metastatic melanoma, and Phase 2 trials for small cell lung cancer (SCLC) and mesothelioma are currently ongoing. Polaris also plans to initiate clinical studies in prostate cancer, pancreatic cancer, leukemia, lymphoma and sarcoma this year.

About Hepatocellular Carcinoma

Hepatocellular carcinoma (primary liver cancer) is one of the most common cancers worldwide, resulting in approximately 700,000 deaths annually. Infection with hepatitis B or C and alcohol consumption are highly associated with the development of hepatocellular carcinoma. The prognosis for patients with this disease is poor as chemotherapy often does not result in prolonged survival, and liver transplantation only increases the survival of selected patients. Despite all forms of current treatment, life expectancy for most patients is only one year post-diagnosis.

About Polaris Group

Polaris Group is a privately held multinational biopharmaceutical company that specializes in the research and development of protein drugs to treat cancer and other debilitating diseases. The company's lead therapeutic, ADI-PEG 20, is advancing into a pivotal Phase 3 trial for hepatocellular carcinoma. Polaris is also investigating ADI-PEG 20 as a treatment for other arginine-dependent cancers, such as melanoma, prostate cancer, leukemia, lymphoma, sarcoma and pancreatic cancer. In addition to the ADI-PEG 20 project, Polaris is researching and developing other biotherapeutic agents and has a small molecule drug program that utilizes rational structure-based approach to design novel compounds that inhibit the biological function of cancer-related protein targets.

For additional information please visit www.polarispharma.com

SOURCE Polaris Group

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