( 80 patients with metastatichormone-ref...)Cell Genesys Reports GVAX Immunotherapy for Prostate Cancer Induces,a Broad, Patient-Specific Antibody Response,Health

80 patients with metastatic hormone-refractory prostate cancer (HRPC). Additional follow-up of the 22 patients who received the dose that is comparable to that being employed in the company's ongoing Phase 3 program revealed that their median survival is 35.0 months. Four patients have withdrawn consent to further follow-up and thus were censored in the analysis. The company also has previously reported final median survival results from its first multi-center Phase 2 trial of GVAX immunotherapy for prostate cancer in 34 patients with metastatic HRPC that showed an overall median survival of 26.2 months. The survival results from the two, independent multi-center Phase 2 clinical trials compare favorably to the previously published median survival of 18.9 months for metastatic hormone-refractory prostate cancer patients treated with Taxotere(R) (docetaxel) chemotherapy plus prednisone, the current standard of care for these patients. The company's ongoing Phase 3 program is designed to confirm this potential survival benefit of GVAX immunotherapy for prostate cancer.

"The immune response data reported today provide added support for the concept that a whole-cell immunotherapy, such as GVAX immunotherapy for prostate cancer, is an ideal multi-antigen source that is capable of eliciting an immune response to a broad array of tumor-associated antigens," stated Peter K. Working, Ph.D., senior vice president of Research and Development at Cell Genesys. "That the majority of antibody responses are unique to individual patients is further evidence that the non patient-specific format of GVAX immunotherapies is capable of inducing unique, patient-specific immune responses. Moreover, the fact that many of these antigens have not before been associated with prostate cancer, further suggests that a multivalent antigen immunotherapy like GVAX immunotherapy may provide the best potential for inducing an effective anti-tumor immune response, especially for heterogeneous ca
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