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Published on: November 17, 2021
Distinct genetic alterations in pediatric glioblastomas
Sun-ju Byeon1, Jae Kyung Myung, Se Hoon Kim
1Department of Pathology, Seoul Nation University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 110-744, Republic of Korea.
Summary
Pediatric glioblastomas (pGBs) show distinct molecular profiles compared to adult GBs (aGBs), with two pGB subtypes identified. These findings offer potential new targets for pediatric brain tumor diagnosis and treatment.
Area of Science:
- Neuro-oncology
- Pediatric oncology
- Molecular biology
Background:
- Pediatric high-grade gliomas (pGBs), particularly glioblastomas (GBs), are under-studied compared to adult GBs (aGBs).
- The molecular characteristics of pGBs are not well understood, limiting the use of targeted therapies in pediatric patients.
- There is a need to better understand pGBs to improve patient outcomes.
Purpose of the Study:
- To investigate the molecular features of pediatric high-grade gliomas (pGBs).
- To compare the molecular profiles of pGBs with adult glioblastomas (aGBs).
- To identify potential diagnostic, prognostic, and therapeutic targets for pGBs.
Main Methods:
- Analysis of 24 non-brainstem pediatric high-grade gliomas (pGBs).
- Immunohistochemistry and fluorescent in situ hybridization on paraffin-embedded tissues for molecular marker comparison with adult GBs (aGBs).
- Microarray gene expression analysis on snap-frozen tissues from pGBs, aGBs, and non-neoplastic brain tissue.
Main Results:
- p16 loss was more frequent in pGBs; p53, EGFR, and PTEN loss were similar to aGBs.
- No isocitrate dehydrogenase (IDH)1 mutations were found, indicating primary GB.
- Microarray analysis revealed two pGB subtypes: Type B showed gene expression similar to aGBs, while Type A differed significantly, with distinct up- and down-regulated genes, including reduced PDGFRA and CCND2 expression.
Conclusions:
- Two distinct gene expression profiles exist in pediatric glioblastomas (pGBs): one similar to adult GBs (aGBs) and another unique profile.
- Identification of significantly up- and down-regulated genes in pGBs provides potential novel targets for diagnosis, prognosis, and therapy.
- Further research is necessary to establish definitive classification and optimal treatment strategies for pediatric GBs.
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