5-ALA	5-aminolevulinic acid
IDH	isocitrate dehydrogenase
PFS	progression-free survival
OS	overall survival
GTR	gross total resection
WHO	World Health Organization
PGB	porphobilinogen
CPOX	coproporphyrinogen oxidase
PPOX	protoporphyrinogen oxidase
PpIX	protoporphyrin IX
FECH	ferrochelatase
2-HG	2-hydroxyglutarate
FDA the U.S.	Food and Drug Administration
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analysis
GBM	Glioblastoma
LGGs	low-grade gliomas
MGMT	O6-Methylguanine-DNA Methyltransferase
CE	contrast enhancement
LOOCV	leave-one-out cross-validation
EOR	extent of resection
HO-1	heme oxygenase-1
TCA	tricarboxylic acid cycle