ERBB2 and neoplasm: When the dichotomized tumor size variable was added to the multivariate base model and assessed within each BluePrint molecular subtype, the adjusted ORs for tumor size >5 versus ≤5 cm tumor were not significant in any of the BluePrint molecular subgroups (Basal subgroup, OR 0.56, 95 % CI 0.27, 1.17, p = 0.123; HER2 subgroup, OR 0.44, 95 % CI 0.15, 1.24, p = 0.119; Luminal subgroup, OR 1.9, 95 % CI 0.59, 6.17, p = 0.286).