ALT	Alternative Lengthening of Telomeres
ATRX	α-thalassemia/mental retardation syndrome X-linked
ctDNA	Circulating Tumor Deoxyribonucleic Acid
CNS	Central Nervous System
CSF	CerebroSpinal Fluid
DAXX	Death-associated protein 6
ddPCR	Droplet digital Polymerase Chain Reaction
DC	Dentritic Cells
DCE-MRI	Dynamic Contrast Enhanced—Magnetic Resonance Imaging
DNA	Deoxyribonucleic Acid
EGFR	Epidermal Growth Factor Receptor
Erbb2	v-erb-b2 avian erythroblastic leukemia viral oncogene homolog 2
ETS	E26 transformation-specific family transcription factor
IDH	Isocitrate Dehydrogenase
IDH-wt	Isocitrate Dehydrogenase—wild-type
IDH-mut	Isocitrate Dehydrogenase—mutated
hTERT	Human Telomerase Reverse Transcriptase
NGS	New Generation Sequencing
MGMT	O6-methylguanine-DNA methyltransferase
MRI	Magnetic Resonance Imaging
NOS	Not Otherwise Specified
OS	Overall Survival
pHGG	Pediatric High Grade Gliomas
PI3KR1	Phosphatidylinositol 3-kinase regulatory subunit alpha
RNA	Ribonucleic Acid
RdRP	RNA-dependent RNA polymerase
TCGA	The Cancer Genome Atlas
TERC	Telomerase RNA template
TERTp	TElomerase Reverse Transcriptase Promoter
TERTp-mut	TElomerase Reverse Transcriptase Promoter mutated
TERTp-wt	TElomerase Reverse Transcriptase Promoter wild-type
TP53	Tumor suppressor Protein 53
UTSS	Upstream of the Transcription Start Site