Prostate cancer is cancer of the prostate gland. The prostate is part of the male reproductive system. This gland is locates inside the body at the base of the penis, just below the bladder and in front of the rectum. It is composed of the glandular and fibrous tissue enclosed in a capsule of connective tissue. The prostate is in the shape of a donut and about the size of a walnut. It surrounds the first inch or so of the urethra, the tube that carries urine from the bladder. Normal functions of the prostate depend on the presence of the male hormone testosterone, which is produced by the testes. The prostate produces semen, the thick, whitish fluid that carries sperm.
Cancer of the prostate has become the number one cancer in American men. In the United States, approximately 1 in every 11 men will develop prostate cancer during his lifetime. Prostate cancer becomes increasingly common with each decade of life. Over 80 percent of all cases are diagnosed in men over 65.
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