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European Journal of Nuclear Medicine and Molecular Imaging
Published in: European Journal of Nuclear Medicine and Molecular Imaging 3/2019

01-03-2019 | Original Article

Comparison of 18F-GE-180 and dynamic 18F-FET PET in high grade glioma: a double-tracer pilot study

Authors: Marcus Unterrainer, D. F. Fleischmann, C. Diekmann, L. Vomacka, S. Lindner, F. Vettermann, M. Brendel, V. Wenter, B. Ertl-Wagner, J. Herms, C. Wetzel, R. Rupprecht, J. C. Tonn, C. Belka, P. Bartenstein, M. Niyazi, Nathalie L. Albert

Published in: European Journal of Nuclear Medicine and Molecular Imaging | Issue 3/2019

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Abstract

Background

PET represents a valuable tool for glioma imaging. In addition to amino acid tracers such as 18F-FET, PET targeting the 18-kDa mitochondrial translocator-protein (TSPO) is of high interest for high-grade glioma (HGG) imaging due to its upregulation in HGG cells. 18F-GE-180, a novel TSPO ligand, has shown a high target-to-background contrast in HGG. Therefore, we intra-individually compared its uptake characteristics to dynamic 18F-FET PET and contrast-enhanced MRI in patients with HGG.

Methods

Twenty HGG patients (nine IDH-wildtype, 11 IDH-mutant) at initial diagnosis (n = 8) or recurrence (n = 12) were consecutively included and underwent 18F-GE-180 PET, dynamic 18F-FET PET, and MRI. The maximal tumour-to-background ratios (TBRmax) and biological tumour volumes (BTV) were evaluated in 18F-GE-180 and 18F-FET PET. Dynamic 18F-FET PET analysis included the evaluation of minimal time-to-peak (TTPmin). In MRI, the volume of contrast-enhancement was delineated (VOLCE). Volumes were spatially correlated using the Sørensen–Dice coefficient.

Results

The median TBRmax tended to be higher in 18F-GE-180 PET compared to 18F-FET PET [4.58 (2.33–8.95) vs 3.89 (1.56–7.15); p = 0.062] in the overall group. In subgroup analyses, IDH-wildtype gliomas showed a significantly higher median TBRmax in 18F-GE-180 PET compared to 18F-FET PET [5.45 (2.56–8.95) vs 4.06 (1.56–4.48); p = 0.008]; by contrast, no significant difference was observed in IDH-mutant gliomas [3.97 (2.33–6.81) vs 3.79 (2.01–7.15) p = 1.000]. Only 5/20 cases showed higher TBRmax in 18F-FET PET compared to 18F-GE-180 PET, all of them being IDH-mutant gliomas. No parameter in 18F-GE-180 PET correlated with TTPmin (p > 0.05 each). There was a tendency towards higher median BTVGE-180 [32.1 (0.4–236.0) ml] compared to BTVFET [19.3 (0.7–150.2) ml; p = 0.062] with a moderate spatial overlap [median Sørensen–Dice coefficient 0.55 (0.07–0.85)]. In MRI, median VOLCE [9.7 (0.1–72.5) ml] was significantly smaller than both BTVFET and BTVGE180 (p < 0.001 each), leading to a poor spatial correlation with BTVGE-180 [0.29 (0.01–0.48)] and BTVFET [0.38 (0.01–0.68)].

Conclusion

PET with 18F-GE-180 and 18F-FET provides differing imaging information in HGG dependent on the IDH-mutational status, with diverging spatial overlap and vast exceedance of contrast-enhancement in MRI. Combined PET imaging might reveal new insights regarding non-invasive characterization of tumour heterogeneity and might influence patients’ management.
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Metadata
Title
Comparison of 18F-GE-180 and dynamic 18F-FET PET in high grade glioma: a double-tracer pilot study
Authors
Marcus Unterrainer
D. F. Fleischmann
C. Diekmann
L. Vomacka
S. Lindner
F. Vettermann
M. Brendel
V. Wenter
B. Ertl-Wagner
J. Herms
C. Wetzel
R. Rupprecht
J. C. Tonn
C. Belka
P. Bartenstein
M. Niyazi
Nathalie L. Albert
Publication date
01-03-2019
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nuclear Medicine and Molecular Imaging / Issue 3/2019
Print ISSN: 1619-7070
Electronic ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-018-4166-1

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