Hereditary breast cancer commonly occurs in premenopausal women.

遗传性乳癌通常发生于绝经前妇女。

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This association was not observed among premenopausal African-American women.

而在绝经前的美国黑人妇女中未发现这一相关性。

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Men and postmenopausal women need only around 8 mg a day, while premenopausal women need 18 mg a day.

男性和绝经后妇女每天只需8毫克，而绝经前的妇女每天则需18毫克。

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For example, obesity actually appears to be protective for premenopausal breast cancer, whereas it is a risk factor for postmenopausal breast cancer.

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But in the premenopausal years, a woman's sex hormones start to change.

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Weight gain of 25 to 35 pounds is normal in pregnancy and not associated with an increase in risk for either premenopausal or postmenopausal breast cancer, the study found.

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