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Oral Contraceptives and Cancer Risk

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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