When TM levels in patients with NSCLC and SCLC were compared, median values of CYFRA 21-1 and SCC were higher among NSCLC patients, and median values of CEA, NSE, and ProGRP were higher among SCLC patients; comparisons of NSE, ProGRP, and SCC reached statistical significance. Here, CEACAM5 is linked to non-small cell lung carcinoma.