Recent and Past Use of Conjugated Estrogens in Relation to Adenocarcinoma of the Endometrium

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Abstract
It has been suggested that the reported association between estrogen use and endometrial cancer may have been biased because estrogens provoke uterine bleeding in women with otherwise asymptomatic disease. To evaluate this hypothesis we compared 149 patients with endometrial cancer and 402 control subjects with other conditions with reference to the time when they had last used conjugated estrogens. In women who had last used conjugated estrogens two or more years previously and who had taken them for at least five years, the rate-ratio estimate was 3.3 (95 per cent confidence interval, 1.4 to 8.0) relative to women who had never used them.

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