This section of About Breast Cancer describes the many known risk factors for breast cancer—from those that have a large effect on risk (such as getting older, having a strong family history and having carcinoma in situ) to those that have a small effect on risk (such as being tall and taking birth control pills). Also included are tips for lowering risk, information on genetic mutations (including genetic testing) and options like tamoxifen for women at higher risk.
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