Abstract
This study demonstrates high-efficiency sterilisation of single cancer cells in a SCID mouse model of leukaemia using rituximab, a monoclonal antibody that targets CD20, labelled with terbium-149, an alpha-emitting radionuclide. Radio-immunotherapy with 5.5 MBq labelled antibody conjugate (1.11 GBq/mg) 2 days after an intravenous graft of 5·106 Daudi cells resulted in tumour-free survival for >120 days in 89% of treated animals. In contrast, all control mice (no treatment or treated with 5 or 300 µg unlabelled rituximab) developed lymphoma disease. At the end of the study period, 28.4%±4% of the long-lived daughter activity remained in the body, of which 91.1% was located in bone tissue and 6.3% in the liver. A relatively high daughter radioactivity concentration was found in the spleen (12%±2%/g), suggesting that the killed cancer cells are mainly eliminated through the spleen. This promising preliminary in vivo study suggests that targeted alpha therapy with 149Tb is worthy of consideration as a new-generation radio-immunotherapeutic approach.
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Acknowledgement
The authors wish to thank Prof. S. Larson (MSKCC New York) for his very valuable discussion during the preparation of this manuscript and Prof. D. Scheinberg (MSKCC New York) for providing the rituximab-DTPA bioconjugate used in this study. The support by the Swiss National Science Foundation Project Nr. 31–53672.98 and by the European Commission within the HPRI-Program Nr. HPRI-CT-1999–00018 is acknowledged.
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Beyer, GJ., Miederer, M., Vranješ-Đurić, S. et al. Targeted alpha therapy in vivo: direct evidence for single cancer cell kill using 149Tb-rituximab. Eur J Nucl Med Mol Imaging 31, 547–554 (2004). https://doi.org/10.1007/s00259-003-1413-9
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DOI: https://doi.org/10.1007/s00259-003-1413-9