In NSCLC patients, positive results were only seen in CEA, CA125, neuron-specific enolase (NSE), and cytokeratin fraction 21-1 (CYFRA21-1), with positive rates of 22.50 percent, 5.88 percent, 5.88 percent, and 37.93 percent, respectively [26]. This evidence concerns the gene CEACAM5 and non-small cell lung carcinoma.