EGFR and metastatic malignant neoplasm in the lymph nodes: Among the 64 patients with EGFR mutation, pleural invasion, endobronchial metastasis, and lymph node metastasis rates were 62.5% (43/64), 39.1% (25/64), and 34.4% (22/64), respectively, showing statistically significant differences (p = 0.003).