Definition

Prostate cancer is a disease in which the cells of the prostate become abnormal. They start to grow uncontrollably, forming tumors. A tumor is a mass or lump of tissue made of abnormal cells. Tumors may be malignant or benign. A malignant tumor can spread to other parts of the body. Malignant tumors are cancerous. Benign tumors cannot spread to other parts of the body.

Description

The prostate is one of the major male sex glands. It is about the size of a walnut and lies just behind the urinary bladder. Together with the testicles and seminal vesicles, the prostate produces the fluid that makes up semen.

Prostate cancer is the most common form of cancer among men in the United States. It is the second-leading cause of cancer deaths. According to the American Cancer Society there were approximately 179,300 new cases of prostate cancer diagnosed...