Our analysis also proved that patients with CAD had a higher level of carcinoembryonic antigen (CEA) (p < 0.001), CA19-9 (p = 0.030) and cytokeratin 19 fragment (CYFRA21-1) (p = 0.008) than non-CAD patients (Table 1). The gene discussed is CEACAM5; the disease is coronary artery disorder.