CEA: cancer embryonic antigen; CA: cancer antigen; CI: confidence interval; CT: chemotherapy; HR: hazard ratio; Int: intermediate; IQR: interquartile range; LIPI: lung immune prognostic index; LVI: lymphovascular invasion; mOS: median overall survival; NR: not reached; OS: overall survival; PNI: perineural invasion; Ref: reference; TRG: tumor regression grade. " Here, CEACAM5 is linked to neoplasm.