Biological tumour volumes of gliomas in early and standard 20-40 min 18 F-FET PET images differ according to IDH mutation status

European Journal of Nuclear Medicine and Molecular Imaging
Marcus UnterrainerNathalie L Albert

Abstract

For the clinical evaluation of O-(2-18F-fluoroethyl)-L-tyrosine (18F-FET) PET images, the use of standard summation images obtained 20-40 min after injection is recommended. However, early summation images obtained 5-15 min after injection have been reported to allow better differentiation between low-grade glioma (LGG) and high-grade glioma (HGG) by capturing the early 18F-FET uptake peak specific for HGG. We compared early and standard summation images with regard to delineation of the PET-derived biological tumour volume (BTV) in correlation with the molecular genetic profile according the updated 2016 WHO classification. The analysis included 245 patients with newly diagnosed, histologically verified glioma and a positive 18F-FET PET scan prior to any further treatment. BTVs were delineated during the early 5-15 min and standard 20-40 min time frames using a threshold of 1.6 × background activity and were compared intraindividually. Volume differences between early and late summation images of >20% were considered significant and were correlated with WHO grade and the molecular genetic profile (IDH mutation and 1p/19q codeletion status). In 52.2% of the patients (128/245), a significant difference in BTV of >20% between ear...Continue Reading

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