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为确定单用低剂量(0.3mg/d)雌激素疗法与发生子宫内膜癌(EC)危险性之间的关系进行病例对照研究。病例组为1985～1991年间美国华盛顿州3个城市中患EC的45～74岁妇女,经筛选入本组
A case-control study was conducted to determine the relationship between low-dose single-dose (0.3 mg / d) estrogen therapy and the risk of developing endometrial cancer (EC). The case group consisted of 45-74-year-old women with EC in the three cities of Washington State from 1985 to 1991 and were screened into this group