Cancer Antigen 19-9 (CA 19-9; sialyl-Lewis) is a tetra-saccharide usually attached to O-glycans on the cell surface whose function is vital in cell-to-cell recognition processes. It is primarily used diagnostically as a tumor marker for pancreatic cancer. Often complexed to mucins, CA 19-9 is a potential prognostic biomarker of epithelial damage for idiopathic pulmonary fibrosis (IPF).
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