ERBB2 and neoplasm: To investigate the characteristic differences among the subtypes, we compared multiple clinical and pathological features including ER receptor status, HER2 status, PR receptor status, TNM staging, pathological grade, luminal classification, tumor location, and patient age (Figures 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, and 2j).