Interesting study involving 3,399 men. It was found that men who are circumcised before their first sexual intercourse have significantly lower risk for prostate cancer than do uncircumcised men (or men who are circumcised after their first sexual encounter).
The scientists found a 15% reduction in relative risk. They postulated that infectious or inflammatory pathways may be involved in the changing of the prostate cells to cancer. A 1987 study also linked circumcision to reduced prostate cancer risk.