CEA, also known as carcinoembryonic antigen–related cell adhesion molecule 5 (CEACAM5) or CD66e, is a 180 to 200 kDa protein belonging to the CEACAM superfamily that is anchored to the cell surface via glycosylphosphatidylinositol (GPI), It is often highly expressed in various tumor entities (60). This evidence concerns the gene CEACAM5 and neoplasm.