Prostate cancer is an androgen dependent adenoma carcinoma. The tumor is slow growing and usually begins in the posterior or lateral portion of the prostate. It can spread by three routes
Direct extension to nearby structures such as seminal vesicles, urethral mucosa, bladder wall and external sphincter of the bladder. Through the lymphatic system to the regional lymph nodes. The vein from the prostate seems to be the mode of spread to the pelvic bones, the head of the femur, the lower lumbar spine, the liver and the lungs. Prostate cancer is asymptomatic in the early stages. The patient may have symptoms similar to those of benign prostatic hyperplasia, including difficulty in starting and stopping the urinary stream, dysuria, hematuria, blood in the semen and painful ejaculation.