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Published in: Journal of Neuro-Oncology 3/2018

01-09-2018 | Clinical Study

Molecular classification of patients with grade II/III glioma using quantitative MRI characteristics

Authors: Naeim Bahrami, Stephen J. Hartman, Yu-Hsuan Chang, Rachel Delfanti, Nathan S. White, Roshan Karunamuni, Tyler M. Seibert, Anders M. Dale, Jona A. Hattangadi-Gluth, David Piccioni, Nikdokht Farid, Carrie R. McDonald

Published in: Journal of Neuro-Oncology | Issue 3/2018

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Abstract

Background

Molecular markers of WHO grade II/III glioma are known to have important prognostic and predictive implications and may be associated with unique imaging phenotypes. The purpose of this study is to determine whether three clinically relevant molecular markers identified in gliomas—IDH, 1p/19q, and MGMT status—show distinct quantitative MRI characteristics on FLAIR imaging.

Methods

Sixty-one patients with grade II/III gliomas who had molecular data and MRI available prior to radiation were included. Quantitative MRI features were extracted that measured tissue heterogeneity (homogeneity and pixel correlation) and FLAIR border distinctiveness (edge contrast; EC). T-tests were conducted to determine whether patients with different genotypes differ across the features. Logistic regression with LASSO regularization was used to determine the optimal combination of MRI and clinical features for predicting molecular subtypes.

Results

Patients with IDH wildtype tumors showed greater signal heterogeneity (p = 0.001) and lower EC (p = 0.008) within the FLAIR region compared to IDH mutant tumors. Among patients with IDH mutant tumors, 1p/19q co-deleted tumors had greater signal heterogeneity (p = 0.002) and lower EC (p = 0.005) compared to 1p/19q intact tumors. MGMT methylated tumors showed lower EC (p = 0.03) compared to the unmethylated group. The combination of FLAIR border distinctness, heterogeneity, and pixel correlation optimally classified tumors by IDH status.

Conclusion

Quantitative imaging characteristics of FLAIR heterogeneity and border pattern in grade II/III gliomas may provide unique information for determining molecular status at time of initial diagnostic imaging, which may then guide subsequent surgical and medical management.
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Metadata
Title
Molecular classification of patients with grade II/III glioma using quantitative MRI characteristics
Authors
Naeim Bahrami
Stephen J. Hartman
Yu-Hsuan Chang
Rachel Delfanti
Nathan S. White
Roshan Karunamuni
Tyler M. Seibert
Anders M. Dale
Jona A. Hattangadi-Gluth
David Piccioni
Nikdokht Farid
Carrie R. McDonald
Publication date
01-09-2018
Publisher
Springer US
Published in
Journal of Neuro-Oncology / Issue 3/2018
Print ISSN: 0167-594X
Electronic ISSN: 1573-7373
DOI
https://doi.org/10.1007/s11060-018-2908-3

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