Abstract
Purpose
Glioblastoma is a malignant brain tumor with a poor prognosis. Genetic mutations associated with this disease are complex are not fully understood and require further elucidation for the development of new treatments. The purpose of this study was to comprehensively analyze genetic mutations in glioblastomas and evaluate the usefulness of RNA sequencing.
Patients and methods
We analyzed 42 glioblastoma specimens that were resected in routine clinical practice and found wild-type variants of the IDH1 and IDH2 genes. RNA was extracted from frozen specimens and sequenced, and genetic analyses were performed using the CLC Genomics Workbench.
Results
The most common genetic alterations in the 42 glioblastoma specimens were TP53 mutation (28.6%), EGFR splicing variant (16.7%), EGFR mutation (9.5%), and FGFR3 fusion (9.5%). Novel genetic mutations were detected in 8 patients (19%). In 12 cases (28.6%), driver gene mutations were not detected, suggesting an association with PPP1R14A overexpression. Our findings suggest the transcription factors SOX10 and NKX6-2 are potential markers in glioblastoma.
Conclusion
RNA sequencing is a promising approach for genotyping glioblastomas because it provides comprehensive information on gene expression and is relatively cost-effective.
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Data availability
No datasets were generated or analysed during the current study.
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Acknowledgements
We are grateful to the patients who participated in this study. We would like to acknowledge the excellent technical assistance of Ms. Reina Nishida and Ms. Seiko Shibata for the preparation of tumor tissue specimens or RNA extraction.
Funding
This work was supported in part by the Aichi Cancer Center Joint Research Project on Priority Areas (Hirokazu Matsushita).
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Conceptualization, Methodology, Software, Investigation, T.O., R.M., K.M., H.K., H.M.; Methodology, T.O., R.M., K.M., E.S., Y.H.; Project administration, T.O., H.M., K.M.; Resources, Data curation, T.O., R.M., T.Y., Y.O., I.D., N.H.; Supervision, H.M., I.D., N.H.; Writing—original draft, T.O., K.M.; Writing—review & editing, All authors. English editting, Brian Quinn: Japan Medical Communication: www.japan-mc.co.jp. All authors have read and agreed to the published version of the manuscript.
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Takanari Okamoto and Ryo Mizuta are joint first authors.
Importance of the study
In IDH wild-type glioblastoma, pre-treatment molecular pathological classification holds paramount importance for both tumor diagnosis and therapeutic guidance using targeted agents like FGFR3 inhibitors. However, comprehensive genetic analysis remains laborious in current clinical settings, hindering widespread adoption. This study explores the utility of RNA sequencing as a diagnostic tool and assesses its potential for integration into routine clinical practice.
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Okamoto, T., Mizuta, R., Takahashi, Y. et al. Genomic landscape of glioblastoma without IDH somatic mutation in 42 cases: a comprehensive analysis using RNA sequencing data. J Neurooncol 167, 489–499 (2024). https://doi.org/10.1007/s11060-024-04628-z
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DOI: https://doi.org/10.1007/s11060-024-04628-z