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Higher BMI in younger women tied to reduced breast cancer odds

Researchers associated every five-unit increase in body mass index with 23% lower breast cancer risk among women ages 18 to 24, 15% lower risk among those ages 25 to 34, 13% lower risk among those ages 35 to 44 and 12% reduced odds among those ages 45 to 54. The findings in JAMA Oncology also linked higher BMI to a lower likelihood of estrogen- or progesterone-receptor positive breast cancer, but BMI didn't have a consistent relationship with triple negative breast cancer or hormone-receptor negative breast cancer.

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