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Obesity Boosts Risk for Aggressive Breast Cancer

Study Shows Link Between Obesity and Triple-Negative Breast Cancer

Number of Childbirths and Cancer Risk

Triple-negative breast cancers were first identified less than a decade ago, and Phipps says they are still something of a mystery to researchers and doctors.

Findings from a separate analysis of the WHI data, reported last week by Phipps and colleagues, also surprised the researchers. That study was published Feb. 24 online in the Journal of the National Cancer Institute.

The analysis suggested that the more children a woman has delivered, the higher her risk for the cancer. Women in the study who had never given birth had a 40% lower risk for triple-negative cancers than women who had.

Childbirth is known to be protective against estrogen-receptor positive breast cancers.

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