Abstract
Purpose
The WHO 2016 update classifies glioblastomas (WHO grade IV) according to isocitrate dehydrogenase (IDH) gene mutation status. We aimed to determine MRI-based metrics for predicting IDH mutation in glioblastoma.
Methods
This retrospective study included glioblastoma cases (n = 199) with known IDH mutation status and pre-operative MRI (T1WI, T2WI, FLAIR, contrast-enhanced T1W1 at minimum). Two neuroradiologists determined the following MRI metrics: (1) primary lobe of involvement (frontal or non-frontal); (2) presence/absence of contrast-enhancement; (3) presence/absence of necrosis; (4) presence/absence of fluid attenuation in the non-contrast-enhancing tumor (nCET); (5) maximum width of peritumoral edema (cm); (6) presence/absence of multifocal disease. Inter-reader agreement was determined. After resolving discordant measurements, multivariate association between consensus MRI metrics/patient age and IDH mutation status was determined.
Results
Among 199 glioblastomas, 16 were IDH-mutant. Inter-reader agreement was calculated for contrast-enhancement (ĸ = 0.49 [− 0.11–1.00]), necrosis (ĸ = 0.55 [0.34–0.76]), fluid attenuation in nCET (ĸ = 0.83 [0.68–0.99]), multifocal disease (ĸ = 0.55 [0.39–0.70]), and primary lobe (ĸ = 0.85 [0.80–0.91]). Mean difference for peritumoral edema width between readers was 0.3 cm [0.2–0.5], p < 0.001. Multivariate analysis uncovered significant associations between IDH-mutation and fluid attenuation in nCET (OR 82.9 [19.22, ∞], p < 0.001), younger age (OR 0.93 [0.86, 0.98], p = 0.009), frontal lobe location (OR 11.08 [1.14, 352.97], p = 0.037), and less peritumoral edema (OR 0.15 [0, 0.65], p = 0.044).
Conclusions
Conventional MRI metrics and patient age predict IDH-mutation status in glioblastoma. Among MRI markers, fluid attenuation in nCET represents a novel marker with high inter-reader agreement that is strongly associated with Glioblastoma, IDH-mutant.
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Data availability
The authors confirm that the data supporting the findings of this study are available within the article and its supplementary materials. If there are requests for additional data, they can be sent to the corresponding author (S.H.P.).
Abbreviations
- WHO:
-
World Health Organization
- IDH:
-
Isocitrate dehydrogenase
- LGG:
-
Lower grade glioma
- nCET:
-
Non-contrast-enhancing tumor
- IHC:
-
Immunohistochemistry;
- PFS:
-
Progression-free survival
- OS:
-
Overall survival
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by SHP, PPB, TJEM, SSF, and JTP. The first draft of the manuscript was written by SHP and PPB and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Sohil H. Patel, Prem P. Batchala, Thomas J. Eluvathingal Muttikkal, Sergio S. Ferrante, James T. Patrie, Camilo E. Fadul, David Schiff, M. Beatriz Lopes, Rajan Jain declare they have no conflicts of interest.
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Patel, S.H., Batchala, P.P., Muttikkal, T.J.E. et al. Fluid attenuation in non‐contrast‐enhancing tumor (nCET): an MRI Marker for Isocitrate Dehydrogenase (IDH) mutation in Glioblastoma. J Neurooncol 152, 523–531 (2021). https://doi.org/10.1007/s11060-021-03720-y
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DOI: https://doi.org/10.1007/s11060-021-03720-y