Medicine

What are the risk factors of 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. Hormonally related risk factors include early menarch (before age 12), late menopause (after age 55), having no children or postponing childbirth, and obesity in women over 50.

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