Women who take high-dose estrogen birth control pills may be increasing their risk for breast cancer, according to a recent report in Cancer Research, a journal of the American Association for Cancer Research.
Researchers analyzed data from 1,102 women diagnosed with breast cancer and 21,952 controls and found a 50 percent increased risk for breast cancer among those who took oral contraceptives in the past year, compared with never or former users. The risk was confined to contraceptives containing high- and moderate-dose estrogen and a few other formulations. Those who took contraceptives containing low-dose estrogen did not experience increased risk. Data on contraceptive use were gathered from patients’ pharmacy records.
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