The prostate is a walnut-sized gland located in front of the rectum, below the bladder and surrounding the urethra. Its main purpose is to produce fluid that transports sperm during the male orgasm. According to recent estimates, there are 180,000 to 200,000 newly diagnosed cases of prostate cancer detected annually. Prostate cancer is the second leading cause of cancer death in men after lung cancer. In the U.S., approximately 40,000 men die as the result of prostate cancer each year. Prostate cancer is characterized by the uncontrolled growth and potential spread of abnormal cells.