CD66c/CEACAM6

CD66c/CEACAM6, a member of the carcinoembryonic antigen-related cell adhesion molecule (CEACAM) family, is a GPI-anchored glycoprotein containing one IgV-like and two IgC-like domains. It is expressed on granulocytes and monocytes and on epithelia of the gastrointestinal tract, lung and breast. CEACAM6 promotes cell aggregation and aberrant epithelial differentiation, and its overexpression in pancreatic, colorectal, gastric and lung adenocarcinomas is associated with invasion, anoikis resistance and chemoresistance. It also functions as a receptor for pathogenic Neisseria species. Soluble CEACAM6 and serum antibodies against it are investigated as biomarkers, and the antigen is explored as an antibody-drug target.