Abstract
Objective
18F‑fluoro-L‑3,4‑dihydroxyphenylalanine positron emission tomography (F‑DOPA PET) is used in glioma follow-up after radiotherapy to discriminate treatment-related changes (TRC) from tumor progression (TP). We compared the performances of a combined PET and MRI analysis with F‑DOPA current standard of interpretation.
Methods
We included 76 consecutive patients showing at least one gadolinium-enhanced lesion on the T1‑w MRI sequence (T1G). Two nuclear medicine physicians blindly analyzed PET/MRI images. In addition to the conventional PET analysis, they looked for F‑DOPA uptake(s) outside T1G-enhanced areas (T1G/PET), in the white matter (WM/PET), for T1G-enhanced lesion(s) without sufficiently concordant F‑DOPA uptake (T1G+/PET), and F‑DOPA uptake(s) away from hemorrhagic changes as shown with a susceptibility weighted imaging sequence (SWI/PET). We measured lesions’ F‑DOPA uptake ratio using healthy brain background (TBR) and striatum (T/S) as references, and lesions’ perfusion with arterial spin labelling cerebral blood flow maps (rCBF). Scores were determined by logistic regression.
Results
53 and 23 patients were diagnosed with TP and TRC, respectively. The accuracies were 74% for T/S, 76% for TBR, and 84% for rCBF, with best cut-off values of 1.3, 3.7 and 1.25, respectively. For hybrid variables, best accuracies were obtained with conventional analysis (82%), T1G+/PET (82%) and SWI/PET (81%). T1G+/PET, SWI/PET and rCBF ≥ 1.25 were selected to construct a 3-point score. It outperformed conventional analysis and rCBF with an AUC of 0.94 and an accuracy of 87%.
Conclusions
Our scoring approach combining F‑DOPA PET and MRI provided better accuracy than conventional PET analyses for distinguishing TP from TRC in our patients after radiation therapy.
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Abbreviations
- ASL:
-
Arterial spin-labelling
- DSC:
-
Dynamic susceptibility contrast
- F‑DOPA:
-
18F‑fluoro-L‑3,4‑dihydroxyphenylalanine
- FET:
-
18F‑fluoroethyl-tyrosine
- FLAIR:
-
Fluid-attenuated inversion recovery T2 sequence
- IDH:
-
Isocitrate dehydrogenase
- OS:
-
Overall survival
- PET:
-
Positron emission tomography
- RCBF:
-
Regional cerebral blood flow
- ROC:
-
Receiver operating characteristic
- ROI:
-
Region of interest
- SUVmax:
-
Maximum standard uptake value
- SWI:
-
Susceptibility-weighted imaging MRI sequence
- T/S:
-
Tumor-to-striatum ratio
- T1G:
-
MRI T1-weighted sequences after gadolinium contrast agent injection
- TBR:
-
Tumor-to-background ratio
- TP:
-
Tumor progression
- TRC:
-
Treatment-related changes
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All the authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Marc Bertaux, Caroline Dehais, Laura Rozenblum, Laure-Eugenie Tainturier, and Aurelie Kas. Blind examination of images was performed by Arnaud Berenbaum and Marc Bertaux. The first draft of the manuscript was written by Marc Bertaux and all the authors have commented on the previous versions of the manuscript. All the authors read and approved the final manuscript.
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M. Bertaux, A. Berenbaum, A.-L. Di Stefano, L. Rozenblum, M. Soret, S. Bergeret, K. Hoang-Xuan, L.-E. Tainturier, B. Sgard, M.-O. Habert, J.-Y. Delattre, C. Dehais, A. Idbaih, N. Pyatigorskaya and A. Kas declare that they have no competing interests.
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62_2022_1139_MOESM1_ESM.docx
Variance inflation factor values (table S.1), a flow chart of patients (figure S.1) and logistic regressions predicted probabilities with outcome (figure S.2 and S.3) are given in supplementary materials
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Bertaux, M., Berenbaum, A., Di Stefano, AL. et al. Hybrid [18F]-F-DOPA PET/MRI Interpretation Criteria and Scores for Glioma Follow-up After Radiotherapy. Clin Neuroradiol 32, 735–747 (2022). https://doi.org/10.1007/s00062-022-01139-0
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DOI: https://doi.org/10.1007/s00062-022-01139-0