Most prostate cancers grow slowly and may never develop beyond the early stages, and may require only closely monitoring the prostate. The vast majority of prostate cancers are adenocarcinomas, which develop from the gland cells that make the prostate fluid that is added to the semen.
Other types of cancer that can start in the prostate include:
- Small cell carcinomas
- Neuroendocrine tumors (other than small cell carcinomas)
- Transitional cell carcinomas
However, these other types of prostate cancer are quite rare.