Conjugated estrogens and fibrocystic breast disease.
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The association between replacement estrogen use and subsequent development of fibrocystic breast disease was studied at Group Health Cooperative of Puget Sound. Included were 142 women aged 50-64 years diagnosed by biopsy as having fibrocystic breast disease during the years 1978 through 1983. The relative incidence of hospitalization for estrogen users compared with non-users was 1.9 (95% confidence interval 1.3-2.7). The association became stronger with increasing duration of estrogen use.