Fertility Drugs Mean Breast Cancer Risk? Depends on If You Get Pregnant, Study Says - ABC News: Scientists have been concerned about the effects of fertility drugs in recent years, citing a possible relationship between the hormones altered by the drugs and those implicated in breast cancer. Studies attempting to pinpoint the link between fertility drugs and cancer risk have varied widely in their conclusions. Some have found a reduction in cancer risk, some an increased risk. Others found no connection at all.
But researchers at the National Institutes of Health found that although the drugs seem to reduce breast cancer risk in young women, the risk goes up when they get pregnant.
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