| Literature DB >> 2713248 |
S S Jick1, A M Walker, A Stergachis, H Jick.
Abstract
A population-based case-control study of oral contraceptive use and breast cancer was carried out among young women (less than 43 years of age) at Group Health Cooperative of Puget Sound, Seattle, Washington. Use of oral contraceptives before first pregnancy did not materially differ between cases or controls. The rate ratio estimate of breast cancer incidence in women who had used oral contraceptives before first pregnancy compared to those who had not was 0.9 (95% CI = 0.4, 2.1). There were no meaningful patterns of association between breast cancer and duration of use or formulation of oral contraceptive used before first pregnancy.Entities:
Keywords: Age Factors; Biology; Breast Cancer; Cancer; Contraception; Contraceptive Methods; Control Groups; Data Analysis; Demographic Factors; Diseases; Family Planning; Fertility; Fertility Measurements; First Pregnancy Intervals; Matched Groups; Neoplasms; Oral Contraceptives; Parity; Population; Population Characteristics; Population Dynamics; Pregnancy; Pregnancy Intervals; Primiparity; Reproduction; Research Methodology; Risk Factors; Statistical Regression; Time Factors
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Year: 1989 PMID： 2713248 PMCID： PMC2247141 DOI： 10.1038/bjc.1989.125
Source DB: PubMed Journal: Br J Cancer ISSN： 0007-0920 Impact factor: 7.640