pCR: pathological complete response; AC: adriamycin + cyclophosphamide; MP2: MammaPrint High 2; BP: BluePrint; HR+: hormone positive; BC: breast cancer; HER2: human epidermal growth factor 2; NACT: neoadjuvant chemotherapy; SBRT: stereotactic body radiation therapy. This evidence concerns the gene ERBB2 and breast cancer.