Abstract
High-grade gliomas (HGGs) constitute approximately 10 % of all childhood brain tumors and include AA (anaplastic astrocytoma), anaplastic oligodendroglioma (AO), and glioblastoma (GBM). Clinical symptomatology varies greatly with age and can be nonspecific, especially in younger children. Conventional MRI along with functional imaging has increased the diagnostic yield and improved surgical management of these patients. Routine histopathologic diagnosis is based on tissue obtained from biopsy or preferably resection of the tumor; central neuropathological review is recommended. The majority of pediatric HGGs are biologically distinct from adult malignant gliomas; these differences may explain responses to therapy and clinical outcomes. The recently proposed integrated genomic classification identifies six distinct biological subgroups of GBM in children and adults. Driver mutations in genes affecting histone H3.3 (K27M and G34R/V) coupled with mutations involving specific proteins (TP53, ATRX, DAXX) induce defects in chromatin remodeling and may play a central role in the genesis of pediatric HGGs. The current standard of care in pediatric HGGs include surgical resection followed by RT (in children >3years) with concurrent and adjuvant chemotherapy with temozolomide. However, these multimodality treatment strategies have had a minimal impact on improving survival. Ongoing clinical trials are investigating new molecular targets, chemoradiation sensitization of tumor cells, and immunotherapy. Future clinical trials of pediatric HGGs should incorporate the distinction between GBM subgroups and stratify patients using group-specific molecular markers.
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Acknowledgments
Dr. Issai Vanan is the Father Peter J Mckenna St. Baldrick’s Cancer Research Scholar, supported by the St. Baldrick’s Foundation, USA. Dr. Eisenstat holds the Muriel and Ada Hole Kids with Cancer Society Chair in Pediatric Oncology, University of Alberta.
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Vanan, M.I., Mehta, V., Eisenstat, D.D. (2015). High-Grade Glioma. In: Scheinemann, K., Bouffet, E. (eds) Pediatric Neuro-oncology. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-1541-5_10
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DOI: https://doi.org/10.1007/978-1-4939-1541-5_10
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