Abstract
Antibody-drug-conjugates (ADCs) are an emerging class of biological therapeutics. Mirvetuximab soravtansine is a novel folate receptor alpha (FRα)-targeting ADC which represents a potential new treatment for patients with ovarian and other FRα-positive cancers. Since patient immune responses to biological therapeutics may negatively affect drug efficacy and patient safety, regulatory authorities require rigorous monitoring of patient samples. Taking advantage of the immune system’s ability to generate highly specific antibodies, the field has turned to anti-idiotype antibodies as powerful tools for the development of sensitive and specific bioassays. Here, we report the generation and characterization of a highly specific neutralizing anti-idiotype antibody directed against M9346A, the antibody moiety of mirvetuximab soravtansine. The anti-idiotype antibody recognizes M9346A with double-digit picomolar affinity, competes with folate receptor antigen for binding to M9346A, and can be used to develop both anti-drug-antibody and neutralizing antibody assays.
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Loebrich, S., Shen, M., Cohen, E. et al. Development and Characterization of a Neutralizing Anti-idiotype Antibody Against Mirvetuximab for Analysis of Clinical Samples. AAPS J 19, 1223–1234 (2017). https://doi.org/10.1208/s12248-017-0098-0
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DOI: https://doi.org/10.1208/s12248-017-0098-0