Cancer risk linked to vasectomy
About 25% of the men in the study had had vasectomies. Compared with men who had not had vasectomies, they were about 20% more likely to have a prostate cancer that was aggressive (more apt to spread) or lethal. The actual number of men affected, however, was small. The study identified three additional aggressive cancers per 1,000 men who'd had a vasectomy.
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