The positive association of BMI at age 60 with risk was evident for both the luminal A (RR=1.28, 1.23-1.32) and luminal B subtype (RR=1.12, 1.00-1.25) per 5kg/m2 but not for HER2-enriched or basal-like cancers (p<0.0001 for heterogeneity by molecular subtype). Here, ERBB2 is linked to cancer.