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Hormonal birth control linked to breast cancer, study says

Birth control pills
A one-month pack of hormonal birth control pills. Photo: Rich Pedroncelli / AP

Women who use hormonal birth control — pills or devices that release hormones — are at a slightly higher risk for breast cancer, per a new study published in the New England Journal of Medicine.

Why it matters: It "upends widely held assumptions about modern contraceptives for younger generations of women," who think hormonal contraceptives are safer than old methods that contained higher amounts of estrogen, the New York Times reports.