Highlights
- •Progressive gliomas have higher SUVmax (3.57 vs. 1.60; p = 0.003) and TBRmax (3.00 vs. 1.36; p = 0.001) than stable gliomas.
- •Patients with tumors TBRmax < 2.0 have longer progression-free survival compared to patients with tumor TBRmax > 2.0.
- •FET-PET might eventually be able to prognosticate progression of adult BSG. Tumors with a TBRmax > 2.0 might progress more rapidly.
Abstract
Purpose
To investigate 18F-fluoro-ethyl-tyrosine positron emission tomography (FET-PET) imaging characteristics
of adult brainstem glioma (BSG).
Materials and methods
FET-PET imaging and progression-free survival (PFS) of 16 adult patients with BSG
was analyzed (9 high-grade gliomas, 7 low-grade gliomas). SUVmax, TBR, and time activity curves of FET-PET were calculated.
Results
Progressive gliomas had higher SUVmax (3.57 ± 1.47 vs. 1.60 ± 0.51; p = 0.003) and TBRmax (3.00 ± 1.12 vs. 1.36 ± 0.33; p = 0.001) than stable gliomas. Kaplan-Meier analysis showed longer PFS of tumors with
TBRmax < 2.0 compared to tumors with TBRmax > 2.0 (665 ± 32 days versus 220 ± 39 days; p < 0.001).
Conclusion
FET-PET uptake might be associated with disease progression in adult BSG.
Abbreviations:
ADC (apparent diffusion coefficient), BSG (brain stem glioma), Cho (choline), CT (computed tomography), DTI (diffusion tensor imaging), DWI (diffusion weighted imaging), FET (18F-fluoro-ethyl-tyrosine), FLAIR (fluid-attenuated inversion recovery), GBM (glioblastoma multiforme), IDH (isocitrate dehydrogenase), KFS (Karnofsky performance status), LOH (loss of heterozygosity), MCP (middle cerebellar peduncle), MGMT (O(6)-methlyguanine-DNA-methyltransferase), MR (magnetic resonance), MRS (magnetic resonance spectroscopy), NAA (N-acetylaspartate), PET (positron emission tomography), PFS (progression-free survival), PWI (perfusion-weighted imaging), RT (radiation therapy), SUVmax (maximum standardized uptake value), T1w (T1-weighted), T2w (T2-weighted), TAC (time activity curve), TBR (tumor-to-brain ratio), TMZ (temozolomide), VOI (volume of interest), WM (white matter)Keywords
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Article Info
Publication History
Published online: February 07, 2018
Accepted:
January 29,
2018
Received in revised form:
January 25,
2018
Received:
October 27,
2017
Identification
Copyright
© 2018 Elsevier Inc. All rights reserved.