What are the types of testicular cancer?
Most testicular cancers begin in the cells that make sperm (germ cells). There are two main types of germ cell tumors:
- Seminomas - this type of tumor usually grows slowly and is less likely to spread.
- Nonseminomas - this type of tumor is usually more aggressive and is more likely to spread.
A small percentage of testicular cancers start in the cells that make testosterone (stromal cells). Stromal tumors are often non-cancerous (benign).