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Steady Weight Gain Boosts Late-Life Breast Cancer Risk
Date:4/20/2010

Average-sized woman doubles her odds by adding 30 pounds over 30 years, researchers say

TUESDAY, April 20 (HealthDay News) -- Women who pack on the pounds over their lifetime steadily increase their risk for postmenopausal breast cancer, compared with women who maintain their weight, a new study finds.

Earlier studies have linked excess weight with an increased risk for breast cancer in postmenopausal women, but this is one of the few studies that traces the risk as a function of weight gain over time.

"Among women who had never used postmenopausal hormone therapy, those who had a body-mass index (BMI) gain between age 20 and 50 had a doubling of breast cancer risk," said lead researcher Laura Sue, a cancer research fellow at the U.S. National Cancer Institute.

Sue was expected to present the findings Tuesday at the American Association for Cancer Research's annual meeting, in Washington D.C.

For the study, Sue's team collected data on more than 72,000 women who took part in the Prostate, Lung, Colorectal and Ovarian Cancer Screening Trial. When the study began, the women were between 55 and 74 years old. Among these women, 3,677 had developed a postmenopausal breast cancer.

The researchers looked only at women who had had breast cancer and had never taken hormone replacement therapy to reduce menopausal symptoms. Hormone therapy can boost the risk for developing breast cancer, so by looking at women who had never taken the therapy, the researchers were able to better isolate weight as an individual risk factor.

Compared with women who maintained about the same weight at 50 as they had at age 20, women who gained about 30 pounds over the years increased their risk for breast cancer twofold, the study found.

Among the women in the study, almost 57 percent had increased their BMI by five kilograms per meter squared (kg/m2) over 30 years. That's akin to a women 5 feet 4 inches
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