The luminal, HER2-positive tumours and the nonluminal, HER2-positive tumours are two distinct subgroups, with the nonluminal tumours having a poorer prognosis (p<0.0001), and the CBP tumours having a poorer prognosis than the luminal, basal-positive tumours (p<0.0001). Here, ERBB2 is linked to neoplasm.