Definition of Prostate cancer:

Prostate cancer is cancer that grows in prostate gland. The prostate is a small, walnut-sized structure that makes up part of a man's reproductive system. It wraps around the urethra, the tube that carries urine out of the body.

Causes, incidence, and risk factors:

The cause of prostate cancer is unknown. Some studies have shown a relationship between high dietary fat intake and increased testosterone levels.

There is no known association with benign prostatic hyperplasia (BPH).

Prostate cancer is the third most common cause of death from cancer in men of all ages and is the most common cause of death from cancer in men over 75 years old. Prostate cancer is rarely found in men younger than 40.

Men at higher risk include African-America men older than 60, farmers, tire plant workers, painters, and men exposed to cadmium. The lowest number of cases occurs in Japanese men and those who do not eat meat (vegetarians).

Prostate cancers are grouped according to tumor size, any spreading outside the prostate (and how far), and how different tumor cells are from normal tissue. This is called staging. Identifying the correct stage may help the doctor determine which treatment is best.

There are several different ways to stage tumors, including:

• The TNM staging system (most common)
• The A-B-C-D staging system, also known as the Whitmore-Jewett system
• Gleason score