ERBB2 and breast cancer: Consensus clustering of mRNA profiles identified five ordered and stable groups, which were statistically enriched in PAM50-assigned cases of (1) Normal-like (P = 3.8e-2), (2) HER2+ (P = 2.7e-3), (3) Luminal A (P = 3.4e-39), (4) Basal-like (P = 1.1e-42), and (5) Luminal B breast cancer (P = 1.6e-23; Fig. 5A; Appendix Fig. S3A,B).