Effect of postmenopausal hormonal replacement therapy on mammographic density and parenchymal pattern

Mary B. Laya, John Christopher G. Gallagher, Judith S. Schreiman, Eric B. Larson, Patrice Watson, Louis Weinstein

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Abstract

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.

Original languageEnglish
Pages (from-to)433-437
Number of pages5
JournalRadiology
Volume196
Issue number2
Publication statusPublished - Aug 1995

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All Science Journal Classification (ASJC) codes

  • Radiological and Ultrasound Technology

Cite this

Laya, M. B., Gallagher, J. C. G., Schreiman, J. S., Larson, E. B., Watson, P., & Weinstein, L. (1995). Effect of postmenopausal hormonal replacement therapy on mammographic density and parenchymal pattern. Radiology, 196(2), 433-437.