PIP: Approximately 20% of men in the US over age 35 have had a vasectomy. The practice is also performed widely in Australia, Canada, China, Great Britain, India, the Netherlands, New Zealand, and South Korea. 2 research articles reporting an association between vasectomy and prostate cancer published in the "Journal of the American Medical Association" prompted the US National Institutes of Health to sponsor an expert review of the potential for such an association. Leading experts in the field of reproductive health cited conflicting evidence to the association and concluded that, at worst, only a doubtful link exists between prostate cancer and vasectomy. The panel therefore recommended that physicians continue offering and performing vasectomies pursuant to the wishes of their male clients.