RISK FACTORS FOR PROSTATE CANCER: VASECTOMY
A study of 14,607 male nurses in eleven states suggested a link between vasectomies and prostate cancer. Dr. Edward Giovannucci correlated a 60 percent increase in the chances of the cancer in men who underwent the operation. Giovannucci observed that the risk was highest (89 percent) in men who had had a vasectomy over twenty years ago. In the first ten years after the vasectomy, there was no significant risk.
Many physicians see this matter differently however, notably Dr. Herbert Peterson, Chief of the Women's Health and Fertility Branch of the Centers for Disease Control and Prevention in Atlanta. "The association between vasectomy and prostate cancer is not strong; there are two other good studies that found no link, and there is no known biological explanation for a link. It does not make sense," Dr. Peterson said. He pointed out that the majority of men who develop prostate cancer have not undergone a vasectomy. "We spent a whole decade on a wild goose chase exploring the link between vasectomy and heart disease," Dr. Peterson said. "We consistently see that men with vasectomies are healthier and live longer. This is a puzzle that will take some time to resolve."
Patients who have had a vasectomy can be further reassured by an American Urological Association task force that criticized two recent studies linking vasectomy to prostate cancer. They concluded that the studies were scientifically flawed, and resolved that men who have had vasectomies do not need to be tested more frequently than usual for prostate cancer. The task force also pointed out that new information has become available this spring that shows these men are not at increased risk.
Researchers from several major universities also conducted a vasectomy study of over 3,000 newly diagnosed prostate cancer patients and control subjects, including African-Americans, Caucasians, Chinese-Americans, and Japanese-Americans (subjects in past studies were mostly Caucasian). Dr. Esther M. John, an epidemiologist at the Northern California Center and lead researcher of the vasectomy study, said, "We did not find any statistically significant association between vasectomies and cancer.... That conclusion applied regardless of ethnicity. We can't say why other studies found an association and we didn't; I don't think this question is completely resolved yet."
"Vasectomy has become one of the most accepted forms of contraception in this country, and this study finds it does not increase the risk of prostate cancer. While nothing is ever permanent, men should take a lot of solace from this finding," agreed Dr. Ralph W. deVere White, chairman of the Department of Urology at the University of California at Davis Medical Center.
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Men's Health Erectile Dysfunction