Prostate cancer is a disease in which cancer forms in the tissues of the prostate, a male gland just below the bladder and in front of the rectum. Prostate cancer is rare in men younger than 50 years of age, and the chance of developing prostate cancer increases as men get older. In the United States, a man has a one in five chance of being diagnosed with prostate cancer in his lifetime.

9. Sources:
Dana-Farber Cancer Institute; National Institute of Health; American
Cancer Society
Learn more about how prostate
cancer is diagnosed from the
Genitourinary Cancer Treatment
Center at Dana-Farber.