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。
A synthetic estrogen, C21H26O2, used in combination with a progestin in oral contraceptive preparations.
炔雌醇甲醚一种合成的雌激素，化学式为c21h26o2，与。
A synthetic estrogen, C21H26O2, used in combination with a progestin in oral contraceptive preparations.
炔雌醇甲醚一种合成的雌激素，化学式为c21h26o2，与。
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