Adjuvant chemotherapy did not have a role in molecular subtypes HoR + /HER2- (P = 0.11), HoR + /HER2 + (P = 0.36), HoR-/HER2 + (P = 0.22), and HoR-/HER2- (P = 0.20) and tumor grades I (P = 0.78), II (P = 0.23), and III (P = 0.68). The gene discussed is ERBB2; the disease is neoplasm.