An anti-human pulmonary adenocarcinoma monoclonalantibody which belongs to the class IgG1, reacts withhuman pulmonary adenocarcinoma cells but not with normalhuman cells, and recognizes proteins as antigens is usefulfor identify pulmonary adenocarcinoma selectively fromamong normal cells and distinguishing this cancer fromamong other types of cancer and a sandwich enzymeimmunoassay comprising using said monoclonal antibody asthe first antibody and the anti-human pulmonary squamouscell carcinoma monoclonal antibody SLC-454 labeled with anenzyme or a radioisotope as the second antibody whichprovides a highly accurate and reliable serodiagnosis andwhich gives a high percentage of positive reactions withpulmonary adenocarcinoma.
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