CEACAM5 and small cell lung carcinoma: Statistically significant differences after correction for multiple testing were found between both non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC) in relation to controls for sCD26, CEA and CYFRA 21.1 (Mann Whitney U test, NSCLC vs controls: P = 0.002 for sCD26, CEA and CYFRA 21.1; SCLC vs controls: P = 0.040 for sCD26, P = 0.002 for CEA and P = 0.012 for CYFRA 21.1).