Anti-Cancer Antigen 19-9 (CA 19-9) Antibody

This Mouse monoclonal IgM antibody from Antibodies.com recognizes Cancer Antigen 19-9, a sialylated Lewis A glycolipid expressed on epithelial tumor cells and widely studied as a serum tumor marker, most notably in pancreatic adenocarcinoma. Produced by ion exchange purification from murine hybridoma supernatant, the unconjugated antibody is supplied at 1 mg and is validated for use in ELISA and immunohistochemistry workflows. Researchers use it to probe CA 19-9 expression in tissue sections and to develop or characterize immunoassays that quantify this antigen in patient samples. Because the target is a carbohydrate epitope rather than a protein, the IgM isotype is well matched to the repeated saccharide structures that define the CA 19-9 determinant. The unconjugated format allows flexible pairing with secondary reporters or labels of the user's choice. For handling, refrigerate the working aliquots and limit freeze-thaw cycles of the stock to preserve binding activity over time.