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Published in: International Journal of Computer Assisted Radiology and Surgery 4/2018

01-04-2018 | Original Article

MRI radiomics analysis of molecular alterations in low-grade gliomas

Authors: Ben Shofty, Moran Artzi, Dafna Ben Bashat, Gilad Liberman, Oz Haim, Alon Kashanian, Felix Bokstein, Deborah T. Blumenthal, Zvi Ram, Tal Shahar

Published in: International Journal of Computer Assisted Radiology and Surgery | Issue 4/2018

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Abstract

Purpose

Low-grade gliomas (LGG) are classified into three distinct groups based on their IDH1 mutation and 1p/19q codeletion status, each of which is associated with a different clinical expression. The genomic sub-classification of LGG requires tumor sampling via neurosurgical procedures. The aim of this study was to evaluate the radiomics approach for noninvasive classification of patients with LGG and IDH mutation, based on their 1p/19q codeletion status, by testing different classifiers and assessing the contribution of the different MR contrasts.

Methods

Preoperative MRI scans of 47 patients diagnosed with LGG with IDH1-mutated tumors and a genetic analysis for 1p/19q deletion status were included in this study. A total of 152 features, including size, location and texture, were extracted from fluid-attenuated inversion recovery images, \(\hbox {T}_{2}\)-weighted images (WI) and post-contrast \(\hbox {T}_{1}\hbox {WI}\). Classification was performed using 17 machine learning classifiers. Results were evaluated by a fivefold cross-validation analysis.

Results

Radiomic analysis differentiated tumors with 1p/19q intact (\(n=21\); astrocytomas) from those with 1p/19q codeleted (\(n=26\); oligodendrogliomas). Best classification was obtained using the Ensemble Bagged Trees classifier, with sensitivity \(=\) 92%, specificity \(=\) 83% and accuracy \(=\) 87%, and with area under the curve \(=\) 0.87. Tumors with 1p/19q intact were larger than those with 1p/19q codeleted (\(46.2\pm 30.0\) vs. \(30.8\pm 16.8\) cc, respectively; \(p=0.03\)) and predominantly located to the left insula (\(p=0.04\)).

Conclusion

The proposed method yielded good discrimination between LGG with and without 1p/19q codeletion. Results from this study demonstrate the great potential of this method to aid decision-making in the clinical management of patients with LGG.
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Metadata
Title
MRI radiomics analysis of molecular alterations in low-grade gliomas
Authors
Ben Shofty
Moran Artzi
Dafna Ben Bashat
Gilad Liberman
Oz Haim
Alon Kashanian
Felix Bokstein
Deborah T. Blumenthal
Zvi Ram
Tal Shahar
Publication date
01-04-2018
Publisher
Springer International Publishing
Published in
International Journal of Computer Assisted Radiology and Surgery / Issue 4/2018
Print ISSN: 1861-6410
Electronic ISSN: 1861-6429
DOI
https://doi.org/10.1007/s11548-017-1691-5

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