Causes
There's no known cause for testicular cancer. Doctors have found that men with undescended testes have a risk of developing the cancer more than 10 times higher than the general population, even after surgical correction. The cancer can occur in either testicle with equal probability. The incidence also rises in men who have abnormalities of the urinary system.
Men who have been diagnosed with cancer in one testicle have an increased chance of developing it in the remaining testicle as do men with a family history of this disease. It's important to note that there is no association between testicular cancer and vasectomy.