Multiregional radiomics features from multiparametric MRI for prediction of MGMT methylation status in glioblastoma multiforme: A multicentre study

Eur Radiol. 2018 Sep;28(9):3640-3650. doi: 10.1007/s00330-017-5302-1. Epub 2018 Mar 21.

Abstract

Objectives: To build a reliable radiomics model from multiregional and multiparametric magnetic resonance imaging (MRI) for pretreatment prediction of O6-methylguanine-DNA methyltransferase (MGMT) promotor methylation status in glioblastoma multiforme (GBM).

Methods: In this retrospective multicentre study, 1,705 multiregional radiomics features were automatically extracted from multiparametric MRI. A radiomics model with a minimal set of all-relevant features and a radiomics model with univariately-predictive and non-redundant features were built for MGMT methylation prediction from a primary cohort (133 patients) and tested on an independent validation cohort (60 patients). Predictive models combing clinical factors were built and evaluated. Both radiomics models were assessed on subgroups stratified by clinical factors.

Results: The radiomics model with six all-relevant features allowed pretreatment prediction of MGMT methylation (AUC=0.88, accuracy=80 %), which significantly outperformed the model with eight univariately-predictive and non-redundant features (AUC=0.76, accuracy=70 %). Combing clinical factors with radiomics features did not benefit the prediction performance. The all-relevant model achieved significantly better performance in stratified analysis.

Conclusions: Radiomics model built from multiregional and multiparameter MRI may serve as a potential imaging biomarker for pretreatment prediction of MGMT methylation in GBM. The all-relevant features have the potential of offering better predictive power than the univariately-predictive and non-redundant features.

Key points: • Multiregional and multiparametric MRI features reliably predicted MGMT methylation in multicentre cohorts. • All-relevant imaging features predicted MGMT methylation better than univariately-predictive and non-redundant features. • Combing clinical factors with radiomics features did not benefit the prediction performance.

Keywords: Glioblastoma multiforme; Imaging biomarker; Imaging genomics; MGMT methylation; Radiomics.

Publication types

  • Multicenter Study

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Biomarkers, Tumor / genetics*
  • Brain Neoplasms / diagnostic imaging*
  • Brain Neoplasms / genetics
  • Child
  • DNA Methylation*
  • DNA Modification Methylases / genetics*
  • DNA Repair Enzymes / genetics*
  • DNA, Neoplasm / genetics
  • Female
  • Glioblastoma / diagnostic imaging*
  • Glioblastoma / genetics
  • Humans
  • Magnetic Resonance Imaging / methods
  • Male
  • Middle Aged
  • Promoter Regions, Genetic
  • ROC Curve
  • Retrospective Studies
  • Tumor Suppressor Proteins / genetics*
  • Young Adult

Substances

  • Biomarkers, Tumor
  • DNA, Neoplasm
  • Tumor Suppressor Proteins
  • DNA Modification Methylases
  • MGMT protein, human
  • DNA Repair Enzymes