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Radiology, Vol 196, 433-437, Copyright © 1995 by Radiological Society of North America
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MB Laya, JC Gallagher, JS Schreiman, EB Larson, P Watson and L Weinstein
Department of Medicine, University of Washington, Seattle 98195, USA.
PURPOSE: To measure changes and predictors of change in mammograms obtained in postmenopausal women undergoing continuous combined hormonal replacement therapy (HRT). MATERIALS AND METHODS: Mammograms of 41 postmenopausal women obtained before and 1 year after the initiation of HRT were evaluated blindly according to the quantitative density percentage method and the Wolfe classification system. RESULTS: Mammographic densities increased compared with baseline values in 73% of subjects (mean increase, 6.7%; 95% confidence interval, 2.5%, 11.0%; P = .003). A shift in Wolfe classification from lower to greater parenchymal density was noted in 24% of subjects (P = .016). Multivariate analysis results indicated that the lower the tissue density percentage before treatment, the greater the increase in density percentage after treatment. CONCLUSION: An increase in mammographic density was demonstrated in most subjects undergoing continuous combined HRT and was most pronounced in subjects with a lower baseline density percentage.
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