Abstract
Purpose
Nearly all literature for predicting tumor grade in astrocytoma and oligodendroglioma pre-dates the molecular classification system. We investigated the association between contrast enhancement, ADC, and rCBV with tumor grade separately for IDH-mutant astrocytomas and molecularly-defined oligodendrogliomas.
Methods
For this retrospective study, 44 patients with IDH-mutant astrocytomas (WHO grades II, III, or IV) and 39 patients with oligodendrogliomas (IDH-mutant and 1p/19q codeleted) (WHO grade II or III) were enrolled. Two readers independently assessed preoperative MRI for contrast enhancement, ADC, and rCBV. Inter-reader agreement was calculated, and statistical associations between MRI metrics and WHO grade were determined per reader.
Results
For IDH-mutant astrocytomas, both readers found a stepwise positive association between contrast enhancement and WHO grade (Reader A: OR 7.79 [1.97, 30.80], p = 0.003; Reader B: OR 6.62 [1.70, 25.82], p = 0.006); both readers found that ADC was negatively associated with WHO grade (Reader A: OR 0.74 [0.61, 0.90], p = 0.002); Reader B: OR 0.80 [0.66, 0.96], p = 0.017), and both readers found that rCBV was positively associated with WHO grade (Reader A: OR 2.33 [1.35, 4.00], p = 0.002; Reader B: OR 2.13 [1.30, 3.57], p = 0.003). For oligodendrogliomas, both readers found a positive association between contrast enhancement and WHO grade (Reader A: OR 15.33 [2.56, 91.95], p = 0.003; Reader B: OR 20.00 [2.19, 182.45], p = 0.008), but neither reader found an association between ADC or rCBV and WHO grade.
Conclusions
Contrast enhancement predicts WHO grade for IDH-mutant astrocytomas and oligodendrogliomas. ADC and rCBV predict WHO grade for IDH-mutant astrocytomas, but not for oligodendrogliomas.
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David Joyner: study design, implementation, data collection, interpretation, manuscript draft, and revisions
John Garrett: data collection, manuscript draft, and revisions
Prem Batchala: data interpretation, manuscript draft, and revisions
Bharath Rama: manuscript draft and revisions
Joshua Ravicz: manuscript draft and revisions
James Patrie: statistical analysis, interpretation, manuscript draft, and revisions
Maria-B. Lopes: interpretation, manuscript draft, and revisions
Camilo Fadul: interpretation, manuscript draft, and revisions
David Schiff: interpretation, manuscript draft, and revisions
Rajan Jain: interpretation, manuscript draft, and revisions
Sohil Patel: study design, implementation, data collection, interpretation, manuscript draft, and revisions
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Joyner, D.A., Garrett, J., Batchala, P.P. et al. MRI features predict tumor grade in isocitrate dehydrogenase (IDH)–mutant astrocytoma and oligodendroglioma. Neuroradiology 65, 121–129 (2023). https://doi.org/10.1007/s00234-022-03038-0
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DOI: https://doi.org/10.1007/s00234-022-03038-0