Abstract
NKI/C-3 and NKI/black-13 are monoclonal antibodies recognizing different epitopes on a melanoma-associated antigen that is preserved after fixation in formalin and embedding in paraffin in virtually all melanoma tissues. The antigen, a predominantly cytoplasmic vesicle membrane-bound heterogeneous glycoprotein of 25–110×103 daltons, was shown to be a single 25×103 dalton polypeptide when incorporation of N-linked carbohydrates was inhibited by tunicamycin. The antigen was measured in a double determinant enzyme immunoassay (DDEIA) using NKI/C-3 as catcher antibody. Results from in vitro experiments indicated that the antigen is actively shed from living cells. In sera from melanoma patients with a small tumor burden, the antigen concentrations were in the range of those of controls (0–22 U/ml). Significantly increased values (33–600 U/ml) were found in sera from patients with a moderate or large tumor burden. The antigen concentrations in sera from patients with multiple metastases of other tumors were within the range of controls. Several sera from patients with multiple metastases of colon, pancreatic, and stomach carcinoma, however, contained increased antigen concentrations (45–80 U/ml). These results correspond with the reactions of NKI/C-3 in tissue sections of some malignancies other than melanoma.
During the follow-up of melanoma patients the concentrations of circulating antigen correlated with tumor progression. The predictive value of the NKI/C-3 assay was no better than determination of serum lactate dehydrogenase, alkaline phosphatase or gamma glutamyl transferase activity.
Keywords: Melanoma Patient, Tunicamycin, Glutamyl, Gamma Glutamyl, Gamma Glutamyl Transferase
References
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