The prostate is a male sex gland that is about the size of a walnut. It produces a thick fluid that is a normal component of semen in men. Prostate cancer is the most common cancer among men in the United States after non-melanoma skin cancer, and is the third leading cause of cancer-related deaths. Prostate cancer is expected to be diagnosed in 186,320 men in 2008.¹ Because of widespread screening efforts, the majority of newly diagnosed prostate cancers are found early when they are still confined to the prostate gland, thus the number of prostate cancer-related deaths has decreased.