By multivariate analysis, EIC (OR = 2.58, 95% CI: 1.54–4.32, P <0.001), pN stage (N3 vs. N0: OR = 3.92, 95% CI: 1.60–9.62, P = 0.003), and the HER-2 BC subtype (HER-2 vs. luminal A: OR = 2.60, 95% CI: 1.48–4.57, P <0.001; Table 4) were significantly correlated with positive CMs. Here, ERBB2 is linked to breast cancer.