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Anti-CD22 Onconase: Preparation and Characterization

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Antibodies can be conjugated to effector molecules to derive targeted therapeutics with properties such as cell-specific cytotoxicity. The murine anti-CD22 antibody RFB4 linked to a member of the ribonuclease A superfamily, Onconase (Onc), becomes a potential drug candidate for non-Hodgkin’s lymphoma. Onc is currently in Phase III clinical trials for unresectable malignant mesothelioma but conjugation to RFB4 considerably enhances its specificity for CD22+ lymphomas. RFB4-targeted Onc is effective in preclinical models, causes little non-specific toxicities in mice, and has favorable formulation properties. Derivatization and conjugation of RFB4 and Onc have been optimized.
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