Wednesday, June 27, 2012

Circumcision May Help Protect Against Prostate Cancer


A new analysis led by researchers at Fred Hutchinson Cancer Research Center has found that circumcision before a male’s first sexual intercourse may help protect against prostate cancer. The study suggests that circumcision can hinder infection and inflammation that may lead to this malignancy.

Infections are known to cause cancer, and research suggests that sexually transmitted infections may contribute to the development of prostate cancer. Also, certain sexually transmitted infections can be prevented by circumcision. Therefore, it stands to reason that circumcision should protect against the development of some cases of prostate cancer. This is what lead author Jonathan L. Wright, MD, an affiliate investigator in the Hutchinson Center’s Public Health Sciences Division, and his colleagues set out to test.

For their study, the investigators analyzed information from 3,399 men (1,754 with prostate cancer and 1,645 without). Men who had been circumcised before their first sexual intercourse were 15 percent less likely to develop prostate cancer than uncircumcised men. This reduced risk applied for both less aggressive and more aggressive cancers. (Specifically, men circumcised before their first sexual intercourse had a 12 percent reduced risk for developing less aggressive prostate cancer and an 18 percent reduced risk for developing more aggressive prostate cancer.)

Sexually transmitted infections may lead to prostate cancer by causing chronic inflammation that creates a hospitable environment for cancer cells. Other mechanisms may also be involved. Circumcision may protect against sexually transmitted infections, and therefore prostate cancer, by toughening the inner foreskin and by getting rid of the moist space under the foreskin that may help pathogens survive.

“These data are in line with an infectious/inflammatory pathway which may be involved in the risk of prostate cancer in some men,” said Dr. Wright, who is also an assistant professor of urology at the University of Washington School of Medicine. “Although observational only, these data suggest a biologically plausible mechanism through which circumcision may decrease the risk of prostate cancer. Future research of this relationship is warranted,” he added


The above story is based on the March 12, 2012 news release by Wiley-Blackwell, which publishes Cancer on behalf of the American Cancer Society.

The research finding has been published early online in CANCER:                                                               Wright JL, Lin DW , Stanford JL. Circumcision and the risk of prostate cancer. Cancer, 2012; DOI: 10.1002/cncr.26653

Prostate cancer is the fourth most common cancer in Malaysia. Of the 502 prostate cancer cases diagnosed in 2007 and reported to National Cancer Registry*, 264 or 52.5% in Chinese males compared to Malay and Indian males. This statistics seem to lend credence to the research by Jonathan L. Wright et al. All Malay males are Muslims and are thus circumcised while the majority of Chinese and Indians are not.

Well-established risk factors for prostate cancer, such as age, family history, race, and country of residence are not amenable to modification. Several modifiable characteristics have been proposed to predict risk of prostate cancer. These include physical activity, various anthropometric measures, cigarette smoking, alcohol consumption, and diet.

Cancer Research UK has more information on these risk factors.

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