Analysis of the SEER database found significant differences in survival of male breast cancer according to tumor subtypes. Adjusted Cox hazard ratios for OS by tumor subtype with HR+/HER2- as reference were 1.55 for HR+/HER+ (p=0.001), 1.1 for HR-/HER2+ (p=0,888), and 3.59 for TN (pxtagstartz0.001).