Abstract
Sandwich radioimmunometric assay (RIA) for a new tumor‐associated carbohydrate antigen defined by a monoclonal antibody (MoAb), NCC‐ST‐439, was developed and the antigen levels were determined in sera of normal donors, and patients with various malignant and non‐malignant disorders. In normal donors, 97.0% (226/233) of sera were antigen‐negative (less than 12 units/ml) except for 7 serum samples from young females. In patients with malignant disorders, 34.2% (82/240) were antigen‐positive, in particular 64.0% (16/25) of patients with pancreatic carcinoma, 66.7% (16/24) of patients with recurrent colorectal carcinoma and 54,5% (6/11) of patients with recurrent breast carcinoma. In patients with non‐malignant disorders, 6.0% (7/116) were antigen‐positive. The positive rate in benign hepatobiliary disorders, including gallstones, hepatitis and liver cirrhosis, was especially low at 4.3% (1/23). We concluded that determination of serum NCC‐ST‐439 antigen would be useful in serodiagnosis of carcinoma patients.
Keywords: Monoclonal antibody, NCC‐ST‐439, Sandwich radioimmunometric assay, Tumor‐associated carbohydrate antigen
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