Anthropometric and hormonal risk factors for male breast cancer: Male breast cancer pooling project results

Louise A. Brinton, Michael B. Cook, Valerie McCormack, Kenneth C. Johnson, Hakan Olsson, John T. Casagrande, Rosie Cooke, Roni T. Falk, Susan M. Gapstur, Mia M. Gaudet, J. Michael Gaziano, Georgios Gkiokas, Pascal Guenel, Brian E. Henderson, Albert Hollenbeck, Ann W. Hsing, Laurence N. Kolonel, Claudine Isaacs, Jay H. Lubin, Karin B. MichelsEva Negri, Dominick Parisi, Eleni Th Petridou, Malcolm C. Pike, Elio Riboli, Howard D. Sesso, Kirk Snyder, Anthony J. Swerdlow, Dimitrios Trichopoulos, Giske Ursin, Piet A. Van Den Brandt, Stephen K. Van Den Eeden, Elisabete Weiderpass, Walter C. Willett, Marianne Ewertz, David B. Thomas

Research output: Contribution to journalArticlepeer-review


Background The etiology of male breast cancer is poorly understood, partly because of its relative rarity. Although genetic factors are involved, less is known regarding the role of anthropometric and hormonally related risk factors. Methods In the Male Breast Cancer Pooling Project, a consortium of 11 case-control and 10 cohort investigations involving 2405 case patients (n = 1190 from case-control and n = 1215 from cohort studies) and 52 013 control subjects, individual participant data were harmonized and pooled. Unconditional logistic regression generated study design-specific (case-control/cohort) odds ratios (ORs) and 95% confidence intervals (CIs), with exposure estimates combined using fixed effects meta-analysis. All statistical tests were two-sided. Results Risk was statistically significantly associated with weight (highest/lowest tertile: OR = 1.36; 95% CI = 1.18 to 1.57), height (OR = 1.18; 95% CI = 1.01 to 1.38), and body mass index (BMI; OR = 1.30; 95% CI = 1.12 to 1.51), with evidence that recent rather than distant BMI was the strongest predictor. Klinefelter syndrome (OR = 24.7; 95% CI = 8.94 to 68.4) and gynecomastia (OR = 9.78; 95% CI = 7.52 to 12.7) were also statistically significantly associated with risk, relations that were independent of BMI. Diabetes also emerged as an independent risk factor (OR = 1.19; 95% CI = 1.04 to 1.37). There were also suggestive relations with cryptorchidism (OR = 2.18; 95% CI = 0.96 to 4.94) and orchitis (OR = 1.43; 95% CI = 1.02 to 1.99). Although age at onset of puberty and histories of infertility were unrelated to risk, never having had children was statistically significantly related (OR = 1.29; 95% CI = 1.01 to 1.66). Among individuals diagnosed at older ages, a history of fractures was statistically significantly related (OR = 1.41; 95% CI = 1.07 to 1.86). Conclusions Consistent findings across case-control and cohort investigations, complemented by pooled analyses, indicated important roles for anthropometric and hormonal risk factors in the etiology of male breast cancer. Further investigation should focus on potential roles of endogenous hormones.

Original languageEnglish
Article numberdjt465
JournalJournal of the National Cancer Institute
Issue number3
Publication statusPublished - 2014

ASJC Scopus subject areas

  • Cancer Research
  • Oncology


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