Prostate cancer starts when cells in the prostate gland start to grow out of control. The prostate gland is found only in males. It makes a type of fluid that is part of semen. One can find the prostate gland below the bladder and in front of the rectum. Just behind this prostate are glands called seminal vesicles that make most of the fluid for semen. The urethra, the tube that carries urine and semen out of the body through the penis, goes through the center of the prostate. Continue Reading.....