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Journal of Experimental & Clinical Cancer Research
Published in: Journal of Experimental & Clinical Cancer Research 1/2016

Open Access 01-12-2016 | Research

The comparison of clinical and biological characteristics between IDH1 and IDH2 mutations in gliomas

Authors: Hao-Yuan Wang, Kai Tang, Ting-Yu Liang, Wei-Zhong Zhang, Ji-Ye Li, Wen Wang, Hui-Min Hu, Ming-Yang Li, Hui-Qing Wang, Xiao-Zheng He, Zhi-Yuan Zhu, Yan-Wei Liu, Shi-Zhong Zhang

Published in: Journal of Experimental & Clinical Cancer Research | Issue 1/2016

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Abstract

Background

Mutations in isocitrate dehydrogenase 1 (IDH1) and isocitrate dehydrogenase 2 (IDH2) are frequent in low-grade gliomas and secondary glioblastomas (sGBM). Because they yield the same oncometabolite, D-2-hydroxyglutarate, they are often treated as equivalent and pooled. The objective of this study was to provide insight into the differences between IDH1 and IDH2 mutant gliomas.

Methods

To investigate the different clinical and molecular characterization between IDH1 mutant and IDH2 mutant gliomas, we studied 811 patients with IDH1 mutations, IDH2 mutations and IDH1/2 wild-type. In addition, whole-transcriptome sequencing and DNA methylation data were used to assess the distribution of genetic changes in IDH1 and IDH2 mutant gliomas in a Chinese population-based cohort.

Results

Among 811 gliomas in our cohort, 448 cases (55.2 %) harbored an IDH1 mutation, 18 cases (2.2 %) harbored an IDH2 mutation and 345 cases (42.6 %) harbored an IDH1/2 wild-type. We found that IDH1 and IDH2 are mutually exclusive in gliomas, and IDH2 mutations are mutually exclusive with PTEN, P53 and ATRX mutations. Patients with IDH2 mutations had a higher frequency of 1p/19q co-deletion (p < 0.05) than IDH1 mutant patients. In addition, a Gene Set Enrichment Analysis (GSEA) showed that IDH2 mutant gliomas were associated with the oxidative phosphorylation gene set, and the four most representative biological processes for genes commonly altered by hypermethylation in IDH2 mutant gliomas were the regulation of cell proliferation, cell motion, cell migration and response to hypoxia. Patients with IDH2 mutant gliomas exhibited longer Overall survival (OS) (p < 0.05) and longer Progression-free survival (PFS) (p < 0.05) than patients with IDH1/2 wild-type gliomas. However, their OS and PFS did not differ from that of IDH1 mutant patients.

Conclusions

Our study revealed an intrinsic distinction between IDH1 and IDH2 mutant gliomas, and these mutations should be considered separately because their differences could have implications for the diagnosis and treatment of IDH1/2 mutant gliomas.
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Metadata
Title
The comparison of clinical and biological characteristics between IDH1 and IDH2 mutations in gliomas
Authors
Hao-Yuan Wang
Kai Tang
Ting-Yu Liang
Wei-Zhong Zhang
Ji-Ye Li
Wen Wang
Hui-Min Hu
Ming-Yang Li
Hui-Qing Wang
Xiao-Zheng He
Zhi-Yuan Zhu
Yan-Wei Liu
Shi-Zhong Zhang
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Journal of Experimental & Clinical Cancer Research / Issue 1/2016
Electronic ISSN: 1756-9966
DOI
https://doi.org/10.1186/s13046-016-0362-7

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