CEACAM5 and metastatic malignant neoplasm in the lymph nodes: Clinical characteristics (gender, age, long-axis diameter, and short-axis diameter of the largest regional lymph node, pathological T stage, CEA, and lymph node metastasis) were not statistically different between the training group and the testing group (all P>0.05); while the long-axis diameter, short-axis diameter, and T stage of the lymph node were statistically different between the LNM+ group and the LNM- group (all P<0.05), in both training and the testing groups.