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Intravoxel incoherent motion (IVIM) modeling of diffusion MRI during chemoradiation predicts therapeutic response in IDH wildtype glioblastoma

  • Pejman Jabehdar Maralani
  • , Sten Myrehaug
  • , Hatef Mehrabian
  • , Aimee K.M. Chan
  • , Max Wintermark
  • , Chris Heyn
  • , John Conklin
  • , Benjamin M. Ellingson
  • , Saba Rahimi
  • , Angus Z. Lau
  • , Chia Lin Tseng
  • , Hany Soliman
  • , Jay Detsky
  • , Shadi Daghighi
  • , Julia Keith
  • , David G. Munoz
  • , Sunit Das
  • , Eshetu G. Atenafu
  • , Nir Lipsman
  • , James Perry
  • Greg Stanisz, Arjun Sahgal

Research output: Contribution to journal › Article › peer-review

Abstract

Background: Prediction of early progression in glioblastoma may provide an opportunity to personalize treatment. Simplified intravoxel incoherent motion (IVIM) MRI offers quantitative estimates of diffusion and perfusion metrics. We investigated whether these metrics, during chemoradiation, could predict treatment outcome. Methods: 38 patients with newly diagnosed IDH-wildtype glioblastoma undergoing 6-week/30-fraction chemoradiation had standardized post-operative MRIs at baseline (radiation planning), and at the 10th and 20th fractions. Non-overlapping T1-enhancing (T1C) and non-enhancing T2-FLAIR hyperintense regions were independently segmented. Apparent diffusion coefficient (ADCT1C, ADCT2-FLAIR) and perfusion fraction (fT1C, fT2-FLAIR) maps were generated with simplified IVIM modelling. Parameters associated with progression before or after 6.9 months (early vs late progression, respectively), overall survival (OS) and progression-free survival (PFS) were investigated. Results: Higher ADCT2-FLAIR at baseline [Odds Ratio (OR) = 1.06, 95% CI 1.01–1.15, p = 0.025], lower fT2-FLAIR at fraction 10 (OR = 2.11, 95% CI 1.04–4.27, p = 0.018), and lack of increase in ADCT2-FLAIR at fraction 20 compared to baseline (OR = 1.12, 95% CI 1.02–1.22, p = 0.02) were associated with early progression. Combining ADCT2-FLAIR at baseline, fT2-FLAIR at fraction 10, ECOG and MGMT promoter methylation status significantly improved AUC to 90.3% compared to a model with only ECOG and MGMT promoter methylation status (p = 0.001). Using multivariable analysis, neither IVIM metrics were associated with OS but higher fT2-FLAIR at fraction 10 (HR = 0.72, 95% CI 0.56–0.95, p = 0.018) was associated with longer PFS. Conclusion: ADCT2-FLAIR at baseline, its lack of increase from baseline to fraction 20, or fT2-FLAIR at fraction 10 significantly predicted early progression. fT2-FLAIR at fraction 10 was associated with PFS.

Original languageEnglish (US)
Pages (from-to)258-265
Number of pages8
JournalRadiotherapy and Oncology
Volume156
DOIs
StatePublished - Mar 2021
Externally publishedYes

Keywords

  • Diffusion MRI
  • Glioblastoma
  • Intravoxel incoherent motion imaging
  • Progression-free Survival
  • Radiotherapy
  • Survival

ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Radiology Nuclear Medicine and imaging

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