Risk for Breast Cancer Reduced After Bariatric Surgery

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Risk for Breast Cancer Reduced After Bariatric Surgery

Bariatric surgery for obesity is associated with a reduced risk of developing breast cancer, new data suggest.

In a matched cohort study of more than 69,000 Canadian women, risk for incident breast cancer at 1 year was 40% higher among women who had not undergone bariatric surgery compared with those who had. The risk remained elevated through 5 years of follow-up.

The findings were “definitely a bit surprising,” study author Aristithes G. Doumouras, MD, MPH, assistant professor of surgery at McMaster University in Hamilton, Ontario, told Medscape Medical News. “The patients that underwent bariatric surgery had better cancer outcomes than patients who weighed less than they did, so it showed that there was more at play than just weight loss. This effect was durable [and] shows how powerful the surgery is, and the fact that we haven’t even explored all of its effects.”

The study was published online April 12 in JAMA Surgery.

JAMA Surg. Published online April 12, 2023. AbstractCommentary

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