But only pills containing high-dose estrogen
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Oral contraceptives and an increased risk for breast cancer have been linked in the past, but now researchers have made the link again, showing women who recently used birth control pills with high-dose estrogen have an increased risk for breast cancer compared to women using other versions.
The researchers looked at pharmaceutical oral contraceptive records and prescriptions of 1,102 women diagnosed with breast cancer and and 21,952 controls. Compared to women who formerly used birth control pills or never used them, the risk for breast cancer was increased by about 50% for women who did. The researchers note that the highest risk was for high estrogen—and there was no risk found for low-dose pills.