ERBB2 and neoplasm: Multivariate analysis showed that LVI (P =.007; OR: 4.130; 95% CI: 1.465–11.641), 257 invasive tumor size (P <.001; OR: 7.176; 95% CI: 2.710–19.002), and HER2 expression (P =.006; OR: 5.489; 95% CI: 1.635–18.428) were independently associated with NSLN metastasis (Table 3).