Intraperitoneal application of radiolabeled antibodies for therapy of intraperitoneally disseminated tumor cells has proven to be a promising option in the animal model. The aim of this study was both comparison of retention and biodistribution of 213Bi- and 111In-radioimmunoconjugates (Fab', IgG, IgM) in tumor free mice of after i.p. injection. We could show that the retention time in the intraperitoneal cavity after i.p. injection positively correlates with the molecular weight of the radioimmunoconjugates. Intraperitoneal retention of IgM was significantly longer than of IgG and Fab'-fragments. Moreover, IgM was eliminated significantly faster from the blood and also excreted faster than IgG and Fab'. Therefore, i.p. application of IgM-radioimmunoconjugates for therapy of intraperitoneally disseminated tumor cells promises a higher therapeutic efficacy combined with a lower toxicity than administration of IgG and Fab'- radioimmunoconjugates.
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Intraperitoneal application of radiolabeled antibodies for therapy of intraperitoneally disseminated tumor cells has proven to be a promising option in the animal model. The aim of this study was both comparison of retention and biodistribution of 213Bi- and 111In-radioimmunoconjugates (Fab', IgG, IgM) in tumor free mice of after i.p. injection. We could show that the retention time in the intraperitoneal cavity after i.p. injection positively correlates with the molecular weight of the radioimm...
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