Compared with the control group, the serum levels of ALP and CA125, CEA and CYFRA21-1 were elevated in NSCLC-early/NSCLS-terminal groups, and the levels in the NSCLS-terminal group were further raised in comparison to the NSCLC-early group (P < 0.05) (Table 2). Here, CEACAM5 is linked to non-small cell lung carcinoma.