CEACAM5 and colonic neoplasm: Thus, such markers are used frequently in clinical practice as for example, CEA (Carcinoembryonic antigen) in colon tumors (10, 11), CA19-9 (Carbohydrate antigen 19-9) in pancreatic cancer (12) and a combination of AFP (Alpha-fetoprotein) and HCG (Human chorionic gonadotropin) in testicular germ-cell tumors (13).