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Further investigations of circulating antibodies in colon cancer patients: On the autoantigenicity of the carcinoembryonic antigen

Sera from 190 patients (including 125 patients with cancer of the digestive tract) have been investigated for the presence of circulating antibodies directed against the carcinoembryonic antigen (CEA). Use of three different techniques (passive hemagglutination, immunoadsorption and immunoftuorescence) revealed no evidence for the autoantigenicity of this particular antigen. The titers demonstrated in patients' sera were due to antibodies directed against normal tissue proteins which were present in perchloric acid extracts of colonic tumors.