Strategies for enhancement of radioimmunotherapy

Gerald L Denardo, S. DeNardo, D. Kukis, H. Diril, C. Suey, Claude Meares

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21 Scopus citations


Two new strategies for increasing tumor uptake have been investigated. First the effect of interleukin-2 (IL-2) on tumor uptake of 125I-Lym-l antibody in nude mice was investigated. Secondly, the use of 67Cu-labeled Lym-1 was evaluated in patients. In nude mice implanted with Raji human lymphoma, a greater than 2-fold enhancement of tumor uptake of 125I-Lym-1 was observed after administration of PEG-interleukin-2 (PEG-IL-2). The macrocycle 1,4,8,11-tetraazacylcotetradecane-N,N′,N′,N'''-tetraacetic acid (TETA), synthesized specifically for copper chelation, has been conjugated to Lym-1 for 67Cu labeling of the monoclonal antibody (MoAb). There was no evidence for bone or normal marrow uptake and the residence time in the tumor was prolonged. Surprisingly, a dose of 4.4 mCi that was intended for imaging induced substantial tumor regression in a patient.

Original languageEnglish (US)
JournalInternational Journal of Radiation Applications and Instrumentation.
Issue number6
StatePublished - 1991


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