CEACAM5 and neoplasm: Tumor markers expression levels obtained for CEA (4.2 - 5.1 ng/mL), CA 15-3 (17–27 U/mL), CA-125 (21–28 U/mL), CA 19-9 (12–37 U/ml), NSE (8–22 ng/mL), CYFRA 21-1 (1.9 – 4.35 ng/mL) and SCC (0.9 – 1.7 ng/mL) for NSCLC patients correlated well with literature data for early and advanced stages of non-small cell lung cancer (19–24).