Preoperative MRI-radiomics features improve prediction of survival in glioblastoma patients over MGMT methylation status alone Journal Article

   

Authors:	Tixier, F.; Um, H.; Bermudez, D.; Iyer, A.; Apte, A.; Graham, M. S.; Nevel, K. S.; Deasy, J. O.; Young, R. J.; Veeraraghavan, H.
Article Title:	Preoperative MRI-radiomics features improve prediction of survival in glioblastoma patients over MGMT methylation status alone
Abstract:	Background: Glioblastoma (GBM) is the most common malignant central nervous system tumor, and MGMT promoter hypermethylation in this tumor has been shown to be associated with better prognosis. We evaluated the capacity of radiomics features to add complementary information to MGMT status, to improve the ability to predict prognosis. Methods: 159 patients with untreated GBM were included in this study and divided into training and independent test sets. 286 radiomics features were extracted from the magnetic resonance images acquired prior to any treatments. A least absolute shrinkage selection operator (LASSO) selection followed by Kaplan-Meier analysis was used to determine the prognostic value of radiomics features to predict overall survival (OS). The combination of MGMT status with radiomics was also investigated and all results were validated on the independent test set. Results: LASSO analysis identified 8 out of the 286 radiomic features to be relevant which were then used for determining association to OS. One feature (edge descriptor) remained significant on the external validation cohort after multiple testing (p=0.04) and the combination with MGMT identified a group of patients with the best prognosis with a survival probability of 0.61 after 43 months (p=0.0005). Conclusion: Our results suggest that combining radiomics with MGMT is more accurate in stratifying patients into groups of different survival risks when compared to with using these predictors in isolation. We identified two subgroups within patients who have methylated MGMT: one with a similar survival to unmethylated MGMT patients and the other with a significantly longer OS. © Tixier et al.
Keywords:	survival analysis; magnetic resonance imaging; glioblastoma; mgmt; radiomics
Journal Title:	Oncotarget
Volume:	10
Issue:	6
ISSN:	1949-2553
Publisher:	Impact Journals
Date Published:	2019-01-18
Start Page:	660
End Page:	672
Language:	English
DOI:	10.18632/oncotarget.26578
PROVIDER:	scopus
PMCID:	PMC6363013
PUBMED:	30774763
DOI/URL:	https://www.scopus.com/inward/record.uri?eid=2-s2.0-85060153455&doi=10.18632%2foncotarget.26578&partnerID=40&md5=fc3514c9fba21e53a37d3020503c236d
Notes:	Export Date: 1 February 2019 -- Source: Scopus

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