Tumour targeting and radiation dose of radioimmunotherapy with (90)Y-rituximab in CD20+ B-cell lymphoma as predicted by (89)Zr-rituximab immuno-PET: impact of preloading with unlabelled rituximab

European Journal of Nuclear Medicine and Molecular Imaging
Kristoff MuylleDominique Bron

Abstract

To compare using immuno-PET/CT the distribution of (89)Zr-labelled rituximab without and with a preload of unlabelled rituximab to assess the impact of preloading with unlabelled rituximab on tumour targeting and radiation dose of subsequent radioimmunotherapy with (90)Y-labelled rituximab in CD20+ B-cell lymphoma. Five patients with CD20+ B-cell lymphoma and progressive disease were prospectively enrolled. All patients underwent three study phases: initial dosimetric phase with baseline (89)Zr-rituximab PET/CT imaging without a cold preload, followed 3 weeks later by a second dosimetric phase with administration of a standard preload (250 mg/m(2)) of unlabelled rituximab followed by injection of (89)Zr-rituximab, and a therapeutic phase 1 week later with administration of unlabelled rituximab followed by (90)Y-rituximab. PET/CT imaging and tracer uptake by organs and lesions were assessed. With a cold rituximab preload, the calculated whole-body dose of (90)Y-rituximab was similar (mean 0.87 mSv/MBq, range 0.82-0.99 mSv/MBq) in all patients. Without a preload, an increase in whole-body dose of 59% and 87% was noted in two patients with preserved circulating CD20+ B cells. This increase in radiation dose was primarily due to a ...Continue Reading

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