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Curative Multicycle Radioimmunotherapy Monitored by Quantitative SPECT/CT-Based Theranostics, Using Bispecific Antibody Pretargeting Strategy in Colorectal Cancer

Posted by David T. Drummond ⎜ Nov 6, 2017 ⎜ Industry

Radioimmunotherapy of solid tumors using antibody-targeted radionuclides has been limited by low therapeutic indices (TIs). The article below recently reported a novel 3-step pretargeted radioimmunotherapy (PRIT) strategy based on a glycoprotein A33 (GPA33)–targeting bispecific antibody and a small-molecule radioactive hapten, a complex of 177Lu and S-2-(4-aminobenzyl)-1,4,7,10-tetraazacyclododecane tetraacetic acid (177Lu-DOTA-Bn), that leads to high TIs for radiosensitive tissues such as blood (TI 5 73) and kidney (TI 5 12).

They tested the hypothesis that a fractionated anti-GPA33 DOTAPRIT regimen calibrated to deliver a radiation absorbed dose to tumor of more than 100 Gy would lead to a high probability of tumor cure while being well tolerated by nude mice bearing subcutaneous GPA33-positive SW1222 xenografts.

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