An initial analysis of an ongoing, multicenter case-control
study
indicates that women who have used oral contraceptives are
approximately half as likely to develop ovarian and endometrial
cancer
as women who have never used them and that, despite previous
concerns,
contraceptive use does not appear to increase a woman's risk of
breast
cancer.
The study used population-based cancer registries in eight
geographic regions across the United States to identify women 20-54
years of age with newly diagnosed breast, ovarian, or endometrial
cancer. Controls were women of the same ages without known cancer,
chosen from the same geographic areas by dialing randomly selected
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