ERBB2 and metastatic neoplasm: In HER2‐low metastatic tumors (n = 80), the PAM50 distribution was 35% luminal B (n = 28), 28% basal‐like (n = 22), 16% luminal A (n = 13), 16% HER2‐enriched (n = 13), and 5% normal‐like (n = 4).