ERBB2 and breast neoplasm: Gene expression profiles of locally-treated (no adjuvant systemic therapy) breast tumors from the Netherlands Cancer Institute microarray dataset (local-only Tx: NKI-147) [19] were classified into the intrinsic subtypes (Luminal A, Luminal B, HER2-enriched, Basal-like, and Claudin-low) using the PAM50 and Claudin-low classifiers, as described in [3], [4].