ERBB2 and metastatic malignant neoplasm in the lymph nodes: Univariate analysis revealed that male sex (P<0.001), older age (≥62 years; P = 0.017), larger tumor size (≥3 cm; P<0.001), smoking (P<0.001), a solid predominant type tumor (P = 0.002), pleural invasion (P = 0.003), lymphovascular invasion (P<0.001), lymph node metastasis (P<0.001), advanced pTNM stage (P<0.001), and HER2 protein overexpression (H-score ≥200; P = 0.008) were significantly correlated with poor OS.