A Retrospective Cohort Study of Vasectomy and Prostate Cancer in US Men

Abstract

These results support evidence from other epidemiologic studies that vasectomy increases risk of prostate cancer. The consistency of results among various epidemiologic studies, the increase of risk over time following vasectomy, the apparent lack of confounding or bias, and the existence of physiological changes in the prostate following vasectomy suggest that the association may be causal.