CEACAM5 and colorectal cancer: Kaplan–Meier analysis demonstrated that N stage (1/2 vs. 0) (p = 0.026) and CEA level (ng/mL) (>5 vs. ≤5) (p = 0.006) were significantly correlated with PFS in patients with liver oligometastases of colorectal cancer (Figure 3b,c).