ERBB2 and breast carcinoma: Furthermore, the breast cancer tissues were divided into different subgroups based on molecular subtypes (Luminal A, Luminal B, HER2‐enriched and Triple negative subgroups, Figure S2) or ER/PR/HER2 status (ER+, ER‐, PR+, PR‐, HER2+ and HER2‐ subgroups, Figure S3‐S5).