Prostate cancer occurs when cells within the walnut-sized gland in the male reproductive system mutate and begin to multiply. This gland, called prostate, is located in front of the rectum and underneath the urinary bladder. It surrounds the tube, called urethra, which carries urine from the bladder and semen through the penis. The gland functions by helping in the production and storage of seminal fluid. The prostate gland has an average length of three centimeters and weighs about twenty grams. Read the rest of this entry »