Carcinoma of the prostate (CaP) is the most common cancer in American men and the second leading cause of cancer death. Most cases originate in the peripheral zone of the prostate. Risk factors include increasing age, African American race, family history, and high dietary fat intake. CaP is typically an adenocarcinoma and is graded using the Gleason system. Local spread can occur through the seminal vesicles, bladder, and rectum. Distant spread is usually to bones, lymph nodes, and lungs. Treatment depends on grade and stage, and may include surgery, radiation therapy, hormone therapy, or watchful waiting.