Normal Salivary Mucin Contains the Gastrointestinal Cancer‐Associated Antigen Detected by Monoclonal Antibody 19–9 in the Serum Mucin of Patients1

Abstract
Monoclonal antibody 19-9 produced by a hybridoma prepared from spleen cells of a mouse immunized with a human colon carcinoma cell line, detects an antigen in sera from many patients with gastrointestinal and pancreatic cancer.