( ncers such as prostate cancer. Evide...)Cell Genesys Reports GVAX Immunotherapy for Prostate Cancer Induces,a Broad, Patient-Specific Antibody Response,Health

Evidence of patient-specific immune responses associated with non patient- specific GVAX immunotherapy products has also been reported in other cancers. In August 2004, the company reported on data published in the Journal of Experimental Medicine from a Phase 1 clinical trial of GVAX immunotherapy for pancreatic cancer that provided evidence that patient-specific immune responses can be generated following treatment with this non patient-specific product. The article described detailed analyses of the immune response to the immunotherapy in three out of 14 patients who were long-term survivors and who also demonstrated strong T cell responses to mesothelin, a tumor- associated protein found in the majority of pancreatic cancers and in the GVAX immunotherapy for pancreatic cancer cells. The specificity of the T cell response to mesothelin was shown to be unique to each responding patient providing further scientific proof-of-concept for the company's GVAX immunotherapy strategy.

GVAX immunotherapy for prostate cancer is comprised of two prostate cancer cell lines that have been modified to secrete GM-CSF (granulocyte-macrophage colony stimulating factor), an immune stimulatory hormone, and irradiated for safety. GVAX cancer immunotherapy for prostate cancer is being developed as a non patient-specific, "off-the-shelf" pharmaceutical product.

Cell Genesys is focused on the development and commercialization of novel biological therapies for patients with cancer. The company is currently pursuing two clinical stage product platforms -- GVAX(TM) cancer immunotherapies and oncolytic virus therapies. Ongoing clinical trials include Phase 3 trials of GVAX immunotherapy for prostate cancer, Phase 2 trials of GVAX immunotherapies for pancreatic cancer and for leukemia, and a Phase 1 trial of CG0070 oncolytic virus therapy for bladder cancer. Cell Genesys continues to hold an equity interest in its former subsidiary, Cerege
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