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Preclinical Study Presented at AACR Annual Meeting Shows Broad Anti-Cancer Potential of Peregrine's anti-PS Vascular Targeting Antibodies
Date:4/14/2008

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Dr. Liang and her colleagues reported on their study of a bavituximab equivalent antibody, 2aG4, in combination with a clinical stage small molecule agent, PRIMA-1. PRIMA-1 restores the normal function of mutant forms of the tumor suppressor p53, enabling it to induce tumor cell death. The combination therapy resulted in additive and synergistic anti-tumor effects in two mouse models of advanced breast cancer, enhancing tumor regression and elimination, while also reducing the incidence of lymph node metastases in some subjects.

Dr. Liang noted, "These results indicate that PRIMA-1 plus 2aG4 combination therapy has a complementary and potent anti-tumor activity and could define a new strategy for suppression of advanced breast cancers."

Bavituximab is a monoclonal antibody that binds to a phospholipid called phosphatidylserine that is usually located inside normal cells, but which becomes exposed on the outside of the cells that line the blood vessels of tumors, creating a specific target for anti-cancer treatments. Bavituximab helps mobilize the body's immune system to destroy the blood vessels needed for tumor growth and spread. In a Phase lb pilot trial in advanced cancer patients, bavituximab plus chemotherapy appeared to have a safety profile consistent with chemotherapy alone and showed positive signs of clinical activity, achieving objective response or disease stabilization in 50% of the evaluable patients. Peregrine has received regulatory approval to conduct three Phase II trials to study the anti-tumor effects of bavituximab in combination with chemotherapy. These include two breast cancer protocols and a non-small cell lung cancer protocol. One of the bavituximab breast cancer trials is currently enrolling and dosing patients and the two other trials are expected to begin shortly. Bavituximab is in clinical trials in the U.S. in patients with advanced solid tumors and in patients co-infected with HCV and HIV.

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SOURCE Peregrine Pharmaceuticals, Inc.
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