Abstract
Introduction
The canonical isocitrate dehydrogenase 1 R132 mutation (IDH1 R132) is the most frequent mutation among IDH-mutated gliomas. Non-canonical IDH1 mutations or IDH2 mutations are unusual and their clinical and biological role is still unclear.
Methods
We performed a systematic review and meta-analysis to assess the clinical role of IDH non-canonical mutations.
Results
Overall, we selected 13 of 3513 studies reporting data of 4007 patients with a diagnosis of grade 2 and grade 3 glioma including 3091 patients with a molecularly proven IDH1 or IDH2 mutation. Patients with non-canonical IDH1 mutations were younger and presented a higher DNA methylation level as compared to those with canonical IDH1 R132H alteration. The overall incidence of non-canonical IDH1 mutations was 7.9% (95% CI 5.4–10.7%) in patients with IDH-mutated gliomas. There was no statistical difference in terms of incidence between patients with grade 2 or grade 3 glioma. Patients with non-canonical IDH mutations had a lower rate of 1p19q codeletion (risk difference 31%, 95% CI 23–38%) and presented a significantly prolonged survival (pooled HR 0.47, 95% CI 0.28–0.81) as compared to those with IDH1 R132H mutation.
Conclusion
Non-canonical IDH1 mutations occur in 7.9% of IDH-mutated gliomas and identify a specific subgroup of patients with an improved survival despite a lower rate of 1p19q codeletion. Data about the type of IDH mutation should be collected in clinical practice and within interventional trials as this could be a critical variable for improved stratification and selection of patients.
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No funding or sponsorship was received for this study or publication of this article.
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All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship for this article, take responsibility for the integrity of the work as a whole, and have given their approval for this version to be published.
Author Contribution
EF, VDN, AAB, conceptualization. EF, VDN, AT, LG, IM, SB, DA, writing, software and data curation. VDN, EF, statistical analyses. AAB and RL, supervision, visualization and investigation. All authors helped in review and editing.
Disclosures
All authors (Vincenzo Di Nunno, Enrico Franceschi, Alicia Tosoni, Lidia Gatto, Ilaria Maggio, Daniele Angelini, Stefania Bartolini, Raffaele Lodi, Alba Ariela Brandes) all have nothing to disclose.
Compliance with Ethics Guidelines
This article is based on previously conducted studies and does not contain any new studies with human participants or animals performed by any of the authors.
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Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.
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Di Nunno, V., Franceschi, E., Tosoni, A. et al. Clinical and Molecular Features of Patients with Gliomas Harboring IDH1 Non-canonical Mutations: A Systematic Review and Meta-Analysis. Adv Ther 39, 165–177 (2022). https://doi.org/10.1007/s12325-021-01977-3
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DOI: https://doi.org/10.1007/s12325-021-01977-3