Vasectomy and risk of aggressive prostate cancer: a 24-year follow-up study.

PURPOSE Conflicting reports remain regarding the association between vasectomy, a common form of male contraception in the United States, and prostate cancer risk. We examined prospectively this association with extended follow-up and an emphasis on advanced and lethal disease. PATIENTS AND METHODS Among 49,405 U.S. men in the Health Professionals Follow… (More)