ERBB4 and neoplasm: Kaplan-Meier analysis showed a worse five-year DFS in pHER2Y1248-negative patients who were older than 60 years (P < 0.001) and had positive lymph node status (P < 0.001); tumor size >2.0 cm (P < 0.001); higher histological grade (P < 0.001); HER2E intrinsic subtype (P < 0.001), negative hormone receptors (P < 0.001); negative HER1 status (P < 0.001), positive HER3 (P = 0.002); and/or positive HER4 (P = 0.002) status.