Abstract
Classically, histologic grading of gliomas has been used to predict seizure association, with low-grade gliomas associated with an increased incidence of seizures compared to high-grade gliomas. In 2016, WHO reclassified gliomas based on histology and molecular characteristics. We sought to determine whether molecular classification of gliomas is associated with preoperative seizure presentation and/or post-operative seizure control across multiple glioma subtypes. All gliomas operated at our institution from 2007 to 2017 were identified based on ICD 9 and 10 billing codes and were retrospectively assessed for molecular classification of the IDH1 mutation, and 1p/19q codeletion. Logistic regression models were performed to assess associations of seizures at presentation as well as post-operative seizures with IDH status and the new WHO integrated classification. Our study included 376 patients: 82 IDH mutant and 294 IDH wildtype. The presence of IDH mutation was associated with seizures at presentation [OR 3.135 (1.818–5.404), p < 0.001]. IDH-mutant glioblastomas presented with seizures less often than other IDH-mutant glioma subtypes grade II and III [OR 0.104 (0.032–0.340), p < 0.001]. IDH-mutant tumors were associated with worse post-operative seizure outcomes, demonstrated by Engel Class [OR 2.666 (1.592–4.464), p < 0.001]. IDH mutation in gliomas is associated with an increased risk of seizure development and worse post-operative seizure control, in all grades except for GBM.
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This work was supported by the NINDS K08NS092895 Grant (MD).
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TPE: Contributed to data collection and manuscript writing. NL and DMS: Contributed to data analysis and manuscript writing. AOV and MH: Contributed to data identification and figure generation. NMB and AUA: Contributed to study design and manuscript review. MD: Contributed to article conception, study design, manuscript writing, and over all supervision.
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Easwaran, T.P., Lancki, N., Henriquez, M. et al. Molecular Classification of Gliomas is Associated with Seizure Control: A Retrospective Analysis. Neuromol Med 23, 315–326 (2021). https://doi.org/10.1007/s12017-020-08624-0
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DOI: https://doi.org/10.1007/s12017-020-08624-0