CEACAM5 and non-small cell lung carcinoma: Studies have shown that serum ferritin (SF), squamous cell carcinoma-associated antigen (SCC), NSE, CEA, and CYFRA21-1 were highly expressed in NSCLC and have important clinical value in evaluating clinicopathology, the combined detection of these 5 tumor markers can improve the diagnostic value of NSCLC [19].