CEACAM5 and neoplasm: The results of multivariate analysis showed that the independent prognostic factors for decreased RFS in node-negative patients were a tumor located in the upper chest (odds ratio [OR], 0.767; 95% confidence intervals (CI), 1.523–14.916, P = 0.007), the presence of lymphovascular invasion (OR, 3.534; 95% CI, 1.077–11.596, P = 0.037), and a preoperative serum carcinoembryonic antigen level ≥ 5 μg/ml (OR = 5.466; 95% CI, 1.590–18.787, P = 0.007).