Medicine

What causes breast cancer?

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Risk factors include age (the incidence of breast cancer is rare in women under 35—most cases occur in women over 60); a history of breast cancer in a close blood relative; and a history of breast cancer or benign proliferative breast disease. A high cumulative exposure to female sex hormones (estrogen and progesterone) appears to increase the risk of some breast cancers ...

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Get more facts and information about breast cancer . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

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