Abstract
The efficacy of three murine monoclonal antibodies (MAbs) for immunoscintigraphy of small-cell lung cancer (SCLS) xenografts was studied in a Balb/c nu/nu mouse model. These Mabs, 123C3, 123A8 and MOC191, belong to cluster 1 of anti-SCLC MAbs and bind to the neural cell adhesion molecule (NCAM) with similar affinity. After intraperitoneal injection of these MAbs, labelled with 125I, the highest uptake in tumour tissue was obtained with MAb 123C3. Seven days after the administration of this MAb 13.9% of the injected dose per gram of tumour tissue was retained in the tumour. The corresponding tumour tissue ratios ranged from 3.97 for blood to 31.03 for colon. The imaging results and the tumour uptake were less favourable for the two other MAbs, 123A8 and MOC191 (fractions of injected dose respectively 6.7% and 9.2%), although affinity, biological activity after labelling and uptake in non-tumour tissues were very similar for all three MAbs. These results may be explained by the differences in the interaction between the MAbs and the tumour cells. Mab 123C3 is internalised into tumour cells, whereas both other anti-NCAM Mabs are not. Internalisation into NCI H69 cells was demonstrated in vitro by radioimmunoassay, confocal laser s...Continue Reading
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