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Researchers at Boston University's Sloan Epidemiology Center have uncovered new evidence that might explain why African-American women have a disproportionately higher risk of developing more aggressive and difficult-to-treat forms of breast cancer.
Their study, based on the ongoing Black Women's Health Study, which has followed 59,000 African American women since 1995, found that giving birth to two or more children was associated with a 50 percent increase in the incidence of estrogen and progesterone receptor negative (ER-/PR-) cancers, but only among women who had not breastfed.
