Univariate analysis (See Table S1) and multivariate analysis (See Table S2) in the entire population showed the non-curative surgery plus first-line chemotherapy, AJCC stage 3, distal tumor location, no baseline ascites, and baseline serum carcinoembryonic antigen (CEA) < median were independent prognostic factors for prolonged OS. Here, CEACAM5 is linked to neoplasm.