CEACAM5 and neoplasm: The multivariate analysis revealed that endoscopic tumor length (OR = 3.003, 95% CI, 1.439–6.267, P = 0.003), clinical T stage (OR = 3.342, 95% CI, 1.752–6.374, P <0.001), bioptic tumor differentiation (OR = 1.896, 95% CI, 1.230–2.921, P = 0.004), and preoperative CEA (OR = 1.449, 95% CI, 1.172–1.792, P = 0.001) were independent risk factors for RLN LNM.