Obesity May Increase Risk of Triple-Negative Breast Cancer

http://www.sciencedaily.com/releases/2011/03/110301142011.htm

cienceDaily (Mar. 4, 2011) — New findings published in Cancer Epidemiology, Biomarkers & Prevention, a journal of the American Association for Cancer Research, confirm the risk of breast cancer among women who are obese and not physically active, and suggests additional mechanisms beyond estrogen.

Scientists from the Women's Health Initiative have found a relationship between obesity, physical activity and triple-negative breast cancer, a subtype of breast cancer characterized by a lack of estrogen, progesterone and HER2 expression. Triple-negative breast cancers account for about 10 to 20 percent of all breast cancers and are associated with an extremely poor prognosis due to a lack of targeted drug therapies.

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Results showed that women with the highest BMI had a 35 percent increased risk of triple-negative breast cancers and a 39 percent increased risk of estrogen receptor-positive breast cancers. Those who reported high rates of physical activity had a 23 percent decreased risk of triple-negative breast cancer and a 15 percent decreased risk of estrogen receptor-positive breast cancer.

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