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Assessment of Gadobutrol Safety in Combination with Ionizing Radiation Using a Preclinical MRI-Guided Radiotherapy Model
Journal article   Open access   Peer reviewed

Assessment of Gadobutrol Safety in Combination with Ionizing Radiation Using a Preclinical MRI-Guided Radiotherapy Model

Michael S Petronek, Emily J Steinbach, Amanda L Kalen, Zachariah J Builta, Cameron M Callaghan, Dan E Hyer, Douglas R Spitz, Ryan T Flynn, John M Buatti, Vincent A Magnotta, …
Radiation research, Vol.195(3), pp.230-234
03/01/2021
DOI: 10.1667/RADE-20-00199.1
PMCID: PMC8011992
PMID: 33347596
url
https://www.ncbi.nlm.nih.gov/pmc/articles/8011992View
Open Access

Abstract

MR-linac technology enhances the precision of therapeutic radiation by clarifying the tumor-normal tissue interface and provides the potential for adaptive treatment planning. Accurate delineation of tumors on diagnostic magnetic resonance imaging (MRI) frequently requires gadolinium-based contrast agents (GBCAs). Despite generally being considered safe, previous literature suggests that GBCAs are capable of contrast-induced acute kidney injury (AKI). It is unclear if the risk for AKI is enhanced when GBCAs are administered concurrently with ionizing radiotherapy. During irradiation, gadolinium may be liberated from its chelator which may induce AKI. The goal of this work was to determine if radiation combined with GBCAs increased the incidence of AKI. Using a preclinical MRI-guided irradiation system, where MRI acquisitions and radiation delivery are performed in rapid succession, tumor-bearing mice with normal kidney function were injected with GBCA and treated with 2, 8 or 18 Gy irradiation. Renal function was assessed on days three and seven postirradiation to assess for AKI. No clinically relevant changes in blood urea nitrogen and creatinine were observed in any combination of GBCA and radiation dose. From these data, we conclude that GBCA in combination with radiation does not increase the risk for AKI in mice. Additional investigation of multiple doses of GBCA administered concurrently with irradiation is warranted to evaluate the risk of chronic kidney injury.
Magnetic Resonance Imaging Brain - diagnostic imaging Gadolinium - pharmacology Kidney - pathology Humans Contrast Media - pharmacology Contrast Media - adverse effects Kidney - diagnostic imaging Acute Kidney Injury - chemically induced Radiotherapy, Image-Guided - adverse effects Disease Models, Animal Radiation, Ionizing Kidney - drug effects Organometallic Compounds - adverse effects Brain - radiation effects Gadolinium - adverse effects Acute Kidney Injury - physiopathology Brain - drug effects Kidney - radiation effects Animals Radiotherapy, Image-Guided - methods Brain - pathology Mice Acute Kidney Injury - diagnostic imaging Organometallic Compounds - pharmacology

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