ERBB2 and neoplasm: LVI (LVI) (P =.007; OR: 4.130; 95% confidence interval [CI]: 1.465–11.641), invasive tumor size (P <.001; OR: 7.176; 95% CI: 2.710–19.002), and HER2 over-expression (P =.006; OR: 5.489; 95% CI: 1.635–18.428) were independently associated with NSLN metastasis by the Logistic regression model.