Therapeutic efficacy evaluation of radioimmunotherapy with 90 Y-labeled anti-podoplanin antibody NZ-12 for mesothelioma

Cancer Science
Hitomi SudoTatsuya Higashi

Abstract

Podoplanin is a type I transmembrane sialomucin-like glycoprotein that is highly expressed in malignant mesothelioma. The rat-human chimeric antibody NZ-12 has high affinity for human podoplanin and antibody-dependent cellular cytotoxicity and is applicable for radioimmunotherapy (RIT) to enhance the antitumor effect. In the present study, we evaluated the in vivo and in vitro properties of radiolabeled NZ-12 and the antitumor effect of RIT with 90 Y-labeled NZ-12 in an NCI-H226 (H226) malignant mesothelioma xenograft mouse model. 111 In-labeled NZ-12 bound specifically to H226 cells with high affinity, and accumulation was high in H226 tumors but low in major organs. RIT with 90 Y-labeled NZ-12 significantly suppressed tumor growth and prolonged survival without body weight loss and obvious adverse effects. Higher podoplanin expression levels were observed in human mesothelioma specimens, suggesting higher tumor accumulation of 90 Y-labeled NZ-12 in patients compared with the H226 tumor xenografts. Our findings suggest that 90 Y-labeled NZ-12 is a promising RIT agent as a new therapeutic option for malignant mesothelioma that warrants further clinical studies to evaluate the dosimetry and efficacy in patients.

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Citations

Oct 22, 2020·Monoclonal Antibodies in Immunodiagnosis and Immunotherapy·Mika K KanekoYukinari Kato
Jun 4, 2021·Bioorganic & Medicinal Chemistry·Katsumasa Fujiki, Katsunori Tanaka

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Methods Mentioned

BETA
electrophoresis
surgical resection
xenografts

Software Mentioned

cellSens Standard
GraphPad Prism

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