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Bariatric Surgery Reduces Risk of Obesity-Related Cancers

by Julia Samuel on October 6, 2017 at 2:00 PM
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Bariatric Surgery Reduces Risk of Obesity-Related Cancers

Severely obese patients who underwent bariatric surgery for weight loss were also found to have lowered their risk of developing cancer by at least a third, according to a research done at the University of Cincinnati (UC) College of Medicine.

"We found having bariatric surgery is associated with a reduced risk of cancer, especially obesity-associate cancers including postmenopausal breast cancer, endometrial cancer, pancreatic cancer and colon cancer," explains Daniel Schauer, MD, associate professor in the UC Division of General Internal Medicine and lead researcher. "What's surprising is how great the risk of cancer was reduced."

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The study reviewed medical data of 22,198 individuals who had bariatric surgery and 66,427 nonsurgical patients between 2005 and 2012 with follow-up through 2014. More than 80 percent of patients in the study were women.

Patients undergoing bariatric surgery had a 33 percent lower risk of developing any cancer during follow-up, according to the published findings. Schauer says the benefit is greatest among obesity-associated cancers.
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  • The risk of postmenopausal breast cancer dropped by 42 percent
  • The risk for endometrial cancer dropped 50% in severely obese patients.
  • The risk of colon cancer dropped 41%
  • The risk of pancreatic cancer was lowered by 54%
Mechanism Behind The Reduced Risk of Cancer

Cancer risks for postmenopausal breast cancer and endometrial cancer are closely related to estrogen levels. Having weight loss surgery reduces estrogen level.

Bariatric surgery helps reduce the risk of diabetes and insulin levels which may be a risk factor for pancreatic cancer, while the mechanisms for colon cancer are more complicated.

"I think considering cancer risk is one small piece of the puzzle when considering bariatric surgery, but there are many factors to consider. Reductions in diabetes, hypertension and improvements in survival and quality of life are reason enough," says Schauer. "The study provides an additional reason to consider bariatric surgery."

The study found no significant association between bariatric surgery and cancer risk among men. Schauer says that may be because the vast majority of study patients are female and at least two of the cancers most impacted by bariatric surgery, postmenopausal breast cancer and endometrial cancer, affect women only.

Source: Eurekalert
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