Higher alcohol intake may modify the association between mammographic density and breast cancer: An analysis of three case-control studies

Shannon M. Conroy, Karin Koga, Christy G. Woolcott, Timothy Dahl, Celia Byrne, Chisato Nagata, Giske Ursin, Martin J. Yaffe, Celine M. Vachon, Gertraud Maskarinec

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Alcohol consumption and mammographic density are established risk factors for breast cancer. This study examined whether the association of mammographic density with breast cancer varies by alcohol intake. Mammographic density was assessed in digitized images for 1207 cases and 1663 controls from three populations (Japan, Hawaii, California) using a computer-assisted method. Associations were estimated by logistic regression. When comparing ever to never drinking, mean density was similar and consumption was not associated with breast cancer risk. However, within the Hawaii/Japan subset, women consuming >1 drink/day had a non-significantly elevated relative risk compared to never drinkers. Also in the Hawaii/Japan population, alcohol intake only modified the association between mammographic density and breast cancer in women consuming >1 drink/day (pinteraction=0.05) with significant risk estimates of 3.65 and 6.58 for the 2nd and 3rd density tertiles as compared to 1.57 and 1.61 for never drinkers in Hawaii/Japan. Although these findings suggest a stronger association between mammographic density and breast cancer risk for alcohol consumers, the small number of cases requires caution in interpreting the results.

Original languageEnglish (US)
Pages (from-to)458-460
Number of pages3
JournalCancer Epidemiology
Volume36
Issue number5
DOIs
StatePublished - Oct 2012

Keywords

  • Alcohol
  • Breast cancer
  • Case-control study
  • Mammographic density
  • Pooling

ASJC Scopus subject areas

  • Epidemiology
  • Oncology
  • Cancer Research

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