This is by far the most common type of prostate cancer. Adenocarcinomas occur throughout the body in glandular epithelial cells, which are found in the inside lining of organs, where they secrete fluids such as mucus and digestive juices. There are two primary subtypes of this cancer, also known as glandular prostate cancer:

• Acinar adenocarcinoma (conventional adenocarcinoma): This is the most common form, which starts at the back of the prostate, where it can be felt by your doctor during a digital rectal exam.
• Prostatic ductal adenocarcinoma (PDA): This rarer and more aggressive cancer may develop at the same time as acinar adenocarcinoma and is harder to detect.

This is a type of neuroendocrine tumor, which forms in cells related to the nervous system or in hormone-producing glands. Small cell carcinomas are rare and aggressive, representing less than 1 percent of prostate cancers. Often, there are no symptoms until the cancer has spread, making it difficult to detect in the early stages.

This rare cancer, also known as urothelial cancer, is found in the cells lining the urethra, the tube that carries urine outside the body. It usually begins in the bladder and spreads to the prostate.

Also known as soft-tissue prostate cancer, this rare cancer forms in the muscles and nerves of the prostate.

This very rare and aggressive cancer forms on the flat cells that cover the prostate gland. This cancer commonly spreads to bone, liver and lungs.