Published in:
Open Access
01-08-2021 | Glioblastoma | Original Article – Cancer Research
Integrated analysis of programmed cell death ligand 1 expression reveals increased levels in high-grade glioma
Authors:
Dorothee Hölzl, Georg Hutarew, Barbara Zellinger, Hans U. Schlicker, Christoph Schwartz, Peter A. Winkler, Karl Sotlar, Theo F. J. Kraus
Published in:
Journal of Cancer Research and Clinical Oncology
|
Issue 8/2021
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Abstract
Purpose
Gliomas are the most frequent primary brain tumors of adults. Despite intensive research, there are still no targeted therapies available. Here, we performed an integrated analysis of glioma and programmed cell death ligand 1 (PD-L1) in 90 samples including 58 glioma and 32 control brain tissues.
Methods
To identify PD-L1 expression in glioma, we performed immunohistochemical analysis of PD-L1 tumor proportion score (TPS) using the clinically valid PD-L1 22C3 antibody on 90 samples including controls and WHO grade I–IV gliomas.
Results
We found that PD-L1 is highly expressed in a subfraction of glioma cells. Analysis of PD-L1 levels in different glioma subtypes revealed a strong intertumoral variation of PD-L1 protein. Furthermore, we correlated PD-L1 expression with molecular glioma hallmarks such as MGMT-promoter methylation, IDH1/2 mutations, TERT promoter mutations and LOH1p/19q.
Conclusion
In summary, we found that PD-L1 is highly expressed in a subfraction of glioma, indicating PD-L1 as a potential new marker in glioma assessment opening up novel therapeutic approaches.