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Radiomics MRI Phenotyping with Machine Learning to Predict the Grade of Lower-Grade Gliomas: A Study Focused on Nonenhancing Tumors

Korean Journal of Radiology 2019년 20권 9호 p.1381 ~ 1389
 ( Park Yae-Won ) - Ewha Womans University School of Medicine Department of Radiology

 ( Choi Yoon-Seong ) - Yonsei University College of Medicine Department of Radiology
 ( Ahn Sung-Soo ) - Yonsei University College of Medicine Department of Radiology
 ( Chang Jong-Hee ) - Yonsei University College of Medicine Department of Neurosurgery
 ( Kim Se-Hoon ) - Yonsei University College of Medicine Department of Pathology
 ( Lee Seung-Koo ) - Yonsei University College of Medicine Department of Radiology

Abstract


Objective: To assess whether radiomics features derived from multiparametric MRI can predict the tumor grade of lower-grade gliomas (LGGs; World Health Organization grade II and grade III) and the nonenhancing LGG subgroup.

Materials and Methods: Two-hundred four patients with LGGs from our institutional cohort were allocated to training (n = 136) and test (n = 68) sets. Postcontrast T1-weighted images, T2-weighted images, and fluid-attenuated inversion recovery images were analyzed to extract 250 radiomics features. Various machine learning classifiers were trained using the radiomics features to predict the glioma grade. The trained classifiers were internally validated on the institutional test set and externally validated on a separate cohort (n = 99) from The Cancer Genome Atlas (TCGA). Classifier performance was assessed by determining the area under the curve (AUC) from receiver operating characteristic curve analysis. An identical process was performed in the nonenhancing LGG subgroup (institutional training set, n = 73; institutional test set, n = 37; and TCGA cohort, n = 37) to predict the glioma grade.

Results: The performance of the best classifier was good in the internal validation set (AUC, 0.85) and fair in the external validation set (AUC, 0.72) to predict the LGG grade. For the nonenhancing LGG subgroup, the performance of the best classifier was good in the internal validation set (AUC, 0.82), but poor in the external validation set (AUC, 0.68).

Conclusion: Radiomics feature-based classifiers may be useful to predict LGG grades. However, radiomics classifiers may have a limited value when applied to the nonenhancing LGG subgroup in a TCGA cohort.

키워드

Grade; Lower-grade glioma; Magnetic resonance imaging; Radiomics; The Cancer Genome Atlas
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