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  • Title: A case-control study of risk indicators among women with premenopausal and early postmenopausal breast cancer.
    Author: Lipnick R, Speizer FE, Bain C, Willett W, Rosner B, Stampfer MJ, Belanger C, Hennekens CH.
    Journal: Cancer; 1984 Feb 15; 53(4):1020-4. PubMed ID: 6692286.
    Abstract:
    Among 714 premenopausal and 130 postmenopausal breast cancer cases matched with 8440 controls for age in years and menopausal status, risk indicators for breast cancer were similar, although most associations were stronger in the premenopausal women. Compared with nulliparous women, the relative risk (RR) for those with first birth before age 25 years was 0.7 (95% confidence limits [CL] from 0.5 to 0.9) among premenopausal women, and 0.7 (0.4-1.4) for postmenopausal women. In the premenopausal cases, a history of breast cancer in a sister gave a RR of 3.0 (2.1-4.1) and in a mother 1.9 (1.4-2.5), whereas for the postmenopausal women the RRs were 1.4 (0.6-3.1) and 1.3 (0.6-2.6), respectively. Fibrocystic breast disease was also a significant predictor of subsequent breast cancer in the premenopausal and postmenopausal women. In relation to women having a single birth, premenopausal women with six or more births had a risk of breast cancer of 0.6 (0.4-1.0), which was present even after adjustment for age at first birth.
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