In the 1980s and 1990s, breast cancer rates steadily increased, in parallel with the rise in obesity and the use of hormone replacement therapy, which involves estrogen.
2
新调查表明，早期的研究可能低估了接受混合激素替代疗法的女性患乳腺癌的风险。
New research suggests the risk of developing breast cancer for women who take combined hormone replacement therapy may have been underestimated in earlier studies.
3
这很大程度上是因为激素替代疗法(HRT)使用率下降，HRT能够增加女性患乳腺癌的风险。
This is largely due to a decreased use of hormone replacement therapy (HRT), which has been shown to increase a woman's risk of developing breast cancer.
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