Prostate cancer is the development of cancer in the prostate, a gland in the male reproductive system
. Most often, the cancer arises in the posterior lobe
of the prostate, also known as the peripheral zone. Most prostate cancers are slow growing; however, some grow relatively quickly. The cancer cells may spread from the prostate to other parts of the body, particularly the bones and lymph nodes. It may initially cause no symptoms. In later stages it can lead to difficulty urinating, blood in the urine, or pain in the pelvis, back or when urinating. A disease known as benign prostatic hyperplasia
may produce similar symptoms but is not a malignant condition.