CEACAM5 and metastatic malignant neoplasm in the lymph nodes: Univariate analysis showed that age, smoking history, tumor location, and operation type were not correlated with lymph node metastasis, but sex, tumor diameter, solid composition, plasma carcinoembryonic antigen (CEA) level, pathological type, vascular tumor thrombus, and pleural invasion were all related to lymph node metastasis.