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Health and Medicine for Seniors

Vasectomy Appears to Increase Risk of Aggressive, Lethal Prostate Cancer

Men who had regular PSA screening had a increased risk of 56% for lethal prostate cancer; effect stronger among men who had a vasectomy at younger age.

July 9, 2014 The largest study to examine the link between vasectomy and prostate cancer has found that men who had this birth control procedure have a small increase in their risk of prostate cancer but a stronger risk for advanced or lethal cases of this cancer.

The Harvard School of Public Health (HSPH) researchers found that the association remained even among men who received regular PSA screening, suggesting the increased risk of lethal cancer cannot be explained by diagnostic bias.

The results showed a 10% increased risk of prostate cancer overall in men who had a vasectomy. Vasectomy was not significantly associated with risk of low-grade. However, vasectomy was associated with an increased risk of 20% for advanced prostate cancer and 19% for a lethal case.

Among men who received regular PSA screening, the relative increase in risk of lethal prostate cancer was 56%. The effect appeared to be stronger among men who had a vasectomy at a younger age.

 

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The study appeared online July 7, 2014 in Journal of Clinical Oncology.

"This study follows our initial publication on vasectomy and prostate cancer in 1993, with 19 additional years of follow-up and tenfold greater number of cases. The results support the hypothesis that vasectomy is associated with an increased risk of advanced or lethal prostate cancer," said co-author Lorelei Mucci, associate professor of epidemiology at HSPH.

Vasectomy is a common form of contraception in the U.S., with about 15% of men having the procedure. Prostate cancer is the second-leading cause of cancer death among U.S. men, so identifying risk factors for lethal prostate cancer is important for public health.

The researchers analyzed data from 49,405 U.S. men in the Health Professionals Follow-up Study, who were followed for up to 24 years from 1986 to 2010. During that time, 6,023 cases of prostate cancer were diagnosed, including 811 lethal cases. One in four of the men in this study reported having a vasectomy.

Prior work on this topic raised concerns that the positive associations could be linked to bias. However, in the present study, the researchers had access to diverse information and could rule out potential biases, including that men who have vasectomies may seek more medical care in general, that they may have a higher rates of PSA screening, or that the association was due possible confounding by sexually transmitted infections.

In this study, 16 in 1,000 men developed lethal prostate cancer during 24 years of follow-up. Although the relative increase in the risk associated with vasectomy was significant, this translates to a relatively small increase in absolute difference in the risk of lethal prostate cancer, say the researchers. "The decision to opt for a vasectomy as a form of birth control is a highly personal one and a man should discuss the risks and benefits with his physician," said co-author Kathryn Wilson, research associate in the Department of Epidemiology at HSPH.

Support for the study was provided by the National Cancer Institute/National Institutes of Health.

 

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