A pilot study of male breast cancer in the Veterans Affairs healthcare system.

Background: We report our findings on a hospital-based retrospective pilot cohort with case-controls study, which we carried out to examine genetic, environmental, and occupational risk factors in men with breast cancer.

Methods: 86 men with breast cancer were diagnosed in eight VA medical centers that agreed to collaborate on this project. A case-control analysis was conducted on a subset of the male breast cancer cases (n = 44) and age- and ethnicity-matched controls (n = 77).