Estrogen therapy and risk of breast cancer in postmenopausal women: a case-control study and results of a multivariate analysis

Menopause : the Journal of the North American Menopause Society
Franco LumachiMario Ermani

Abstract

Several randomized trials and observational studies show that the use of hormone therapy (HT) increases the risk of breast cancer (BC). The aim of this study was to assess the effects of exposure to both HT and oral contraceptives (OCs) on BC risk in postmenopausal women, all residing in the same metropolitan area. Data regarding a series of 238 consecutive postmenopausal women with infiltrating ductal carcinoma (cases) and 255 randomly selected age-matched healthy women (controls) were reviewed. Odds ratios for no breast-feeding and HT and OC use were 1.82 (95% CI, 1.20-2.77), 2.49 (95% CI, 1.73-3.58), and 2.06 (95% CI 1.14-3.70), respectively. Four independent variables (years between menarche and menopause, breast-feeding, OC use, and HT use) were included in the final multivariate analysis using logistic regression. The cumulative odds ratio calculated from the observed versus predicted values, obtained using the logistic regression function, was 4.55 (95% CI, 2.13-9.71), whereas the cumulative risk of common exposure to both OCs and HT was 2.77 (95% CI, 1.44-5.32). The logistic model correctly classified 67.5% (95% CI, 63.2-71.5) of cases. The receiver operating characteristic (ROC) curve of the complete logistic function ...Continue Reading

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Citations

May 28, 2013·Asia-Pacific Journal of Public Health·Thunyarat AnothaisintaweeAmmarin Thakkinstian
Sep 25, 2014·The Linacre Quarterly·A Patrick SchneiderAmberly K Windisch
Oct 21, 2010·Acta Psychiatrica Scandinavica·M V Seeman

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