Abstract
Background
The objective of this study was to evaluate the potential of integrated 11C-MET PET/MR for response assessment of relapsed glioblastoma (GBM) receiving bevacizumab treatment.
Methods
Eleven consecutive patients with relapsed GBM were enrolled for an integrated 11C-MET PET/MRI at baseline and at follow-up. Treatment response for MRI was evaluated according to Response Assessment in Neuro-oncology (RANO) criteria and integrated 11C-MET PET was assessed by the T/N ratio.
Results
MRI showed no patient with complete response (CR), six of 11 patients with PR, four of 11 patients with SD, and one of 11 patients with progressive disease (PD). PET revealed metabolic response in five of the six patients with partial response (PR) and in two of the four patients with stable disease (SD), whereas metabolic non-response was detected in one of the six patients with PR, in two of the four patients with SD, and in the one patient with PD. Morphological imaging was predictive for PFS and OS when response was defined as CR, PR, SD, and non-response as PD. Metabolic imaging was predictive when using T/N ratio reduction of >25 as discriminator. Based on the morphologic and metabolic findings of this study a proposal for applying integrated PET/MRI for treatment response in relapsed GBM was developed, which was significantly predictive for PFS and OS (P = 0.010 respectively 0,029, log).
Conclusions
This study demonstrates the potential of integrated 11C-MET-PET/MRI for response assessment of GBM and the utility of combined assessment of morphologic and metabolic information with the proposal for assessing relapsed GBM.
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Abbreviations
- PET:
-
Positron emission tomography
- MRI:
-
Magnetic resonance imaging
- 11C-MET:
-
L-[methyl-11C] Methionine
- SUVmax:
-
Standardized uptake value of the tumor showing the maximum uptake
- MTV:
-
Metabolic tumor volume
- PFS:
-
Progression-free survival
- OS:
-
Overall survival
- c1:
-
Follow-up
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An IFORES grant to CD from the University Duisburg-Essen supported the research [http://www.uni-due.de/med/forschung/forschungsfoerderung/ifores.shtml]. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the Ethics Commission of the Medical Faculty of the University Duisburg-Essen and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study is registered at the Ethics Commission of the Medical Faculty of the University Duisburg-Essen with the number 11–4822-BO. Informed consent was obtained from all individual participants included in the study. This article does not contain any studies with animals performed by any of the authors.
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Joerg Hense and Marc Schlamann contributed equally to this work.
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Deuschl, C., Moenninghoff, C., Goericke, S. et al. Response assessment of bevacizumab therapy in GBM with integrated 11C-MET-PET/MRI: a feasibility study. Eur J Nucl Med Mol Imaging 44, 1285–1295 (2017). https://doi.org/10.1007/s00259-017-3661-0
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DOI: https://doi.org/10.1007/s00259-017-3661-0