The study, based on the UK's nationwide population, used data from the UK's 1997-2012 hospital statistics database.
A total of 8,794 obese patients underwent gastric bypass, gastric girdle or sleeve gastrectomy, and compared the data of 8,794 obese patients who had not had bariatric surgery.
The researchers found that patients who underwent surgery had a 77% lower risk of hormonal-related cancers (breast, prostate, or endometrial cancer) than patients who had not had surgery.
Gastric bypass surgery minimizes the risk of hormonal-related cancers (84%), but increases the risk of colon cancer by up to twice times.
