为何雌激素(E)加孕激素(P)的激素替代疗法(HRT)可增加妇女患乳腺癌的危险呢？
Why does hormone replacement therapy (HRT) with estrogens (e) plus progestins (p) increase the risk of breast cancer?
女性健康机构于2002年提前终止了激素替代疗法，以为他们发现联合使用雌激素和孕激素疗法后，乳腺癌发病率增加了24%。
The Women's Health Initiative study was halted prematurely in 2002 because of a 24 percent higher risk of breast cancer associated with the combination therapy of estrogen and progestin.
吸烟可能因为减少雌激素暴露水平而减少患病危险，应用口服避孕药增加了孕激素水平从而减少患病。
Smoking seems to decrease estrogen exposure, thereby decreasing the cancer risk, and oral contraceptive use increases progestin levels, thus providing protection.
吸烟可能因为减少雌激素暴露水平而减少患病危险，应用口服避孕药增加了孕激素水平从而减少患病。
Smoking seems to decrease estrogen exposure, thereby decreasing the cancer risk, and oral contraceptive use increases progestin levels, thus providing protection.
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