The c-reactive protein (CRP), carbohydrate antigen 19-9 (CA19-9), carbohydrate antigen 15-3 (CA15-3), carcinoembryonic antigen (CEA), and cancer antigen 125 (CA125) are the majority of tumor markers used for the detection of lung cancers [38,39]. The gene discussed is CEACAM5; the disease is lung cancer.