According to this article on the UK Times Online, a virus known to cause leukaemia in animals has been linked to human prostate cancer, suggesting that the disease may have a viral origin. If correct, the finding may lead to more effective screening and vaccination to prevent men from developing the disease. The virus has been shown to cause leukemia and bone cancer in mice but has never before been detected in humans. It is not known how men come to be infected but one possibility is that it is sexually transmitted. The virus was found in 27 per cent of the prostate cancer samples and was associated with the most aggressive tumors. It was found in 6 per cent of benign samples. ------------------- Bottom line: If you have an enlarged prostate and have trouble getting an erection, you may want to ask your doctor to test you for XMRV - the xenotropic murine leukaemia virus-related virus.