The cancer treatment Provenge, known as a "therapeutic vaccine," was approved by the Food and Drug Administration in April, 2010 as a novel way to attack prostate tumors. But this is more than the story of a new treatment. Host Bruce Japsen learns about the long path to FDA approval for this unique therapy that some see as a watershed development in oncology, from Dr. Mark Frohlich, senior vice president of clinical affairs and chief medical officer of Dendreon Corporation, the Seattle-based biotech company that manufactures Provenge.