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Glymphatic system dysfunction in gliomas: A systematic review and meta-analysis of DTI-ALPS index
Fatemeh Taheri Dehaghi1, Amirsaman Soleimani Nasab1, Narges Arabi1
1Department of Radiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
Background:
The glymphatic system's role in brain waste clearance is increasingly recognized in glioma pathophysiology. This study synthesizes evidence on DTI-ALPS index variations across glioma grades, molecular subtypes, and clinical outcomes to evaluate its diagnostic and prognostic utility.
Methods:
Following PRISMA 2020, major databases were searched up to December 20, 2025, for studies of adults with histologically confirmed gliomas who underwent DTI-ALPS assessment. Risk of bias was evaluated using ROBINS-E, and reporting quality using the STROBE checklist. Random-effects meta-analyses examined ALPS differences for six different outcome comparisons.
Results:
Fourteen studies were included. ROBINS-E revealed very high risk of bias in 14% of studies and some concerns in 64%; mean STROBE compliance was 92.2%. High-grade gliomas exhibited lower ALPS indices than low-grade tumors (MD=0.14, 95% CI: 0.11-0.16; I2=0%). IDH wild-type gliomas showed lower ALPS indices than IDH-mutant tumors (MD=0.14, 95% CI: 0.10-0.18; I2=38%). Multivariate Cox regression demonstrated that lower ALPS index is associated with worse overall survival (HR=0.73, 95% CI: 0.49-1.10; I2=57%).
Conclusion:
DTI-ALPS index reliably detects glymphatic dysfunction in gliomas and provides prognostic information, supporting its use as a non-invasive biomarker for glioma assessment. However, methodological standardization and prospective multicenter studies are needed for clinical integration.
