CEACAM5 and metastatic malignant neoplasm in the lymph nodes: In predicting lymph node metastasis in GC, CA199 had the highest sensitivity (23.53 %), specificity (85.07 %), and accuracy (47.93 %) among the four serum tumor markers, and CEA had the worst sensitivity (12.75 %), specificity (92.54 %), and accuracy (44.38 %).