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Erschienen in: Journal of Neuro-Oncology 2/2013

01.11.2013 | Clinical Study

cMYC expression in infiltrating gliomas: associations with IDH1 mutations, clinicopathologic features and outcome

verfasst von: Yazmin Odia, Brent A. Orr, W. Robert Bell, Charles G. Eberhart, Fausto J. Rodriguez

Erschienen in: Journal of Neuro-Oncology | Ausgabe 2/2013

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Abstract

Gliomas are among the most frequent adult primary brain tumors. Mutations in IDH1, a metabolic enzyme, strongly correlate with secondary glioblastomas and increased survival. cMYC is an oncogene also implicated in aberrant metabolism, but its prognostic impact remains unclear. Recent genotyping studies also showed SNP variants near the cMYC gene locus, associate with an increased risk for development of IDH1/2 mutant gliomas suggesting a possible interaction between cMYC and IDH1. We evaluated nuclear cMYC protein levels and IDH1 (R132H) by immunohistochemistry in patients with oligodendroglioma/oligoastrocytomas (n = 20), astrocytomas (grade II) (n = 19), anaplastic astrocytomas (n = 21) or glioblastomas (n = 111). Of 158 tumors with sufficient tissue, 110 (70 %) showed nuclear cMYC immunopositivity—most frequent (95 %, χ2 p = 0.0248) and intense (mean 1.33, ANOVA p = 0.0179) in anaplastic astrocytomas versus glioblastomas (63 %) or low grade gliomas (74 %). cMYC expression associated with younger age as well as p53 immunopositivity (OR = 3.6, p = 0.0332) and mutant IDH1 (R132H) (OR = 7.4, p = 0.06) among malignant gliomas in our cohort. Independent analysis of the publically available TCGA glioblastoma dataset confirmed our strong association between cMYC and mutant IDH1 expression. Both IDH1 (R132H) and cMYC protein expression were associated with improved overall survival by univariate analysis. However, cMYC co-expression associated with shortened time to malignant transformation and overall survival among IDH1 (R132H) mutants in both univariate and multivariate analyses. In summary, our findings suggest that cMYC may be associated with a unique clinicopathologic and biologic group of infiltrating gliomas and help mediate the malignant transformation of IDH1 mutant gliomas.
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Metadaten
Titel
cMYC expression in infiltrating gliomas: associations with IDH1 mutations, clinicopathologic features and outcome
verfasst von
Yazmin Odia
Brent A. Orr
W. Robert Bell
Charles G. Eberhart
Fausto J. Rodriguez
Publikationsdatum
01.11.2013
Verlag
Springer US
Erschienen in
Journal of Neuro-Oncology / Ausgabe 2/2013
Print ISSN: 0167-594X
Elektronische ISSN: 1573-7373
DOI
https://doi.org/10.1007/s11060-013-1221-4

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