( -Data May Support Use of Provenge as Fr...)Dendreon Announces Presentation of Data at American Urological,Association Annual Meeting,Health

SEATTLE and ANAHEIM, Calif., May 20, 2007 /PRNewswire-FirstCall/ -- Dendreon Corporation today announced the presentation of data from an analysis of Phase 3 Studies (D9901 and D9902A) that showed a prolonged survival benefit for patients who were initially treated with Provenge (sipuleucel-T) who then went on to receive docetaxel chemotherapy after disease progression. The data were presented today at the American Urological Association (AUA) Annual Meeting in Anaheim, California.

The abstract, titled "Advanced Prostate Cancer Patients who Receive Sipuleucel-T followed by Docetaxel Have Prolonged Survival" (#605), authored by Daniel P. Petrylak, M.D., associate professor of medicine at New York- Presbyterian Hospital at the Medical Center, is based on an exploratory analysis conducted to assess the influence of the active cellular immunotherapy PROVENGE on the clinical outcome of patients who subsequently went on to receive docetaxel chemotherapy after primary treatment with PROVENGE. The analysis was conducted by evaluating data from two Phase 3 clinical trials of PROVENGE in patient with asymptomatic, metastatic, androgen-independent prostate cancer (AIPC).

"The results of this analysis suggest that the use of sipuleucel-T as a first-line treatment followed by the chemotherapy docetaxel upon disease progression may provide patients with a substantially prolonged survival benefit," said Dr. Petrylak. "This analysis provides valuable clinical insight as to how the treatment of men with advanced prostate cancer will likely evolve with the potential introduction of new products like sipuleucel- T that complement the currently available treatment regimens for men with advanced prostate cancer."

Study Design and Results

This analysis was conducted by evaluating data from two identically designed rando
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