Reproductive characteristics are associated with gene-specific promoter methylation status in breast cancer

Lauren E. McCullough, Lindsay J. Collin, Kathleen Conway, Alexandra J. White, Yoon Hee Cho, Sumitra Shantakumar, Mary Beth Terry, Susan L. Teitelbaum, Alfred I. Neugut, Regina M. Santella, Jia Chen, Marilie D. Gammon

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Reproductive characteristics are well-established risk factors for breast cancer, but the underlying mechanisms are not fully resolved. We hypothesized that altered DNA methylation, measured in tumor tissue, could act in concert with reproductive factors to impact breast carcinogenesis. Methods: Among a population-based sample of women newly diagnosed with first primary breast cancer, reproductive history was assessed using a life-course calendar approach in an interviewer-administered questionnaire. Methylation-specific polymerase chain reaction and Methyl Light assays were used to assess gene promotor methylation status (methylated vs. unmethylated) for 13 breast cancer-related genes in archived breast tumor tissue. We used case-case unconditional logistic regression to estimate adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for associations with age at menarche and parity (among 855 women), and age at first birth and lactation (among a subset of 736 parous women) in association with methylation status. Results: Age at first birth > 27 years, compared with < 23 years, was associated with lower odds of methylation of CDH1 (OR = 0.44, 95% CI = 0.20-0.99) and TWIST1 (OR = 0.48, 95% CI = 0.28-0.82), and higher odds of methylation of BRCA1 (OR = 1.63, 95% CI = 1.14-2.35). Any vs. no lactation was associated with higher odds of methylation of the PGR gene promoter (OR = 1.59, 95% CI = 1.01-2.49). No associations were noted for parity and methylation in any of the genes assayed. Conclusions: Our findings indicate that age at first birth, lactation and, perhaps age at menarche, are associated with gene promoter methylation in breast cancer, and should be confirmed in larger studies with robust gene coverage.

Original languageEnglish
Article number926
JournalBMC Cancer
Volume19
Issue number1
DOIs
StatePublished - Sep 18 2019

Keywords

  • Breast Cancer
  • DNA methylation
  • Epidemiology
  • Epigenetics
  • Reproductive characteristics

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