CEA (Carcinoembryonic Antigen) is a cell-surfaceglycoprotein involved in cell adhesion and tumorprogression. It is strongly expressed in:
• Colorectal adenocarcinoma
• Lung adenocarcinoma
• Breast carcinoma (variable)
• Gastrointestinal malignanciesCEA
expression is rare in mesothelioma and most benignmesothelial tissues, making it a useful research marker todistinguish adenocarcinoma vs. mesothelial tumors.