At present, there are various diagnostic and prognostic indicators for NSCLC, including serology indicators, such as carcinoembryonic antigen [34], CA-125 [35], cytokeratin 19 fragment 21–1 [36], neuron-specific enolase [37], histological indicators such as EGFR [38]. Here, CEACAM5 is linked to non-small cell lung carcinoma.