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PROVENGE Significantly Prolongs Survival in Men With Advanced Prostate Cancer in Pivotal Phase 3 IMPACT Study
Tuesday April 14, 2009, 8:30 am EDT

- Study Meets Primary Endpoint Showing Statistically Significant Improvement in Overall Survival -

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{"s" : "dndn","k" : "c10,l10,p20,t10","o" : "","j" : ""} - First Active Immunotherapy for Cancer to Prolong Survival -

- Full Data to be Presented at Plenary Session at Upcoming AUA Annual Meeting -

- Company to Host a Conference Call Today at 9:00 AM ET -

SEATTLE, April 14 /PRNewswire-FirstCall/ -- Dendreon Corporation (Nasdaq: DNDN - News) announced today that the pivotal Phase 3 IMPACT study of PROVENGE® (sipuleucel-T) in men with advanced prostate cancer met its primary endpoint of improving overall survival compared to a placebo control. The magnitude of the survival difference observed in the intent to treat population resulted in the study successfully achieving the pre-specified level of statistical significance defined by the study's design. The safety profile of PROVENGE appeared to be consistent with prior trials.

The 512-patient, multi-center, randomized, double-blind, placebo-controlled IMPACT (IMmunotherapy for Prostate AdenoCarcinoma Treatment) study enrolled men with metastatic androgen-independent prostate cancer was conducted under a Special Protocol Assessment agreement with the U.S. Food and Drug Administration (FDA).

PROVENGE is Dendreon's investigational product candidate for men with advanced prostate cancer and may represent the first in a new class of active cellular immunotherapies specifically designed to engage the patient's own immune system against cancer.

Detailed results from the IMPACT study will be presented during a plenary session at the American Urological Association's Annual Meeting in Chicago on Tues., Apr. 28 at 2:20 pm CT.

"Survival is the gold standard outcome for oncology clinical trials, and overall survival was the primary endpoint of the IMPACT trial. The positive results from this landmark study provide confirmatory evidence demonstrating that treatment with PROVENGE may prolong survival," said Mitchell H. Gold, M.D., president and chief executive officer of Dendreon. "We are immensely grateful to our clinical investigators and the more than 1,000 men with advanced prostate cancer who have participated in our studies over the last decade and whose courage and contribution have significantly advanced the understanding and treatment of prostate cancer and the potential role of cancer immunotherapies."

"The successful outcome from the Phase 3 IMPACT study provides validation of the long-pursued goal of harnessing the human immune system against a patient's own cancer," continued Dr. Gold.

Because the data meet the criteria and specifications outlined in its Special Protocol Assessment (SPA) agreement with the FDA, Dendreon intends to file an amendment to its existing Biologic License Application (BLA) in the fourth quarter of this year to gain licensure of PROVENGE.

Prostate cancer is the most common non-skin cancer in the United States and the third most common cancer worldwide. More than one million men in the United States have prostate cancer, with an estimated 186,320 new cases and approximately 28,660 men who were expected to die from the disease in 2008. Currently there are limited treatment options for men with advanced, metastatic prostate cancer.

Conference Call Scheduled for Today at 9:00 a.m. ET

Dendreon will host a conference call today at 9:00 a.m. ET. To access the live call, dial 1-877-419-6594 (domestic) or 719-325-4855 (international). The call will also be audio webcast and will be available from the Company's website at http://www.dendreon.com/ under the "Investor/Webcasts and Presentations" section. A recorded rebroadcast will be available for interested parties unable to participate in the live conference call by dialing 1-888-203-1112 (domestic) or 719-457-0820 (international); the conference ID number is 8182435. The replay will be available from 12:00 p.m. ET on April 14, 2009 until midnight April 16, 2009. In addition, the webcast will be archived for on-demand listening for 30 days at www.dendreon.com.