CEACAM5 and colorectal carcinoma: We observed no statistical differences in gender and age (≥55 years and <55 years) between patients with CRC showing different TNM stages (T2-3 stages vs.T4 stage, N0 stage vs. N1-2 stages, M0 stage vs. M1 stage) and preoperative serum CEA levels (≥5 ng/mL and <5 ng/mL) (Table S1).