ERBB2 and neoplasm: Multivariate analysis adjusted for age, T or N stage, ER/PR/HER2 status, tumour grade, and LVI by stepwise selection revealed that the RI-DR high-risk group and N2 category were poor prognostic factors for DRFI, RFI, DRFS, and RFS with hazard ratios of 3.8 (1.6–9.0), 3.5 (1.5–8.1), 3.2 (1.6–6.3), and 3.1 (1.6–6.0), respectively (Table 3).