Myeloid tumor-infiltrating cells expressed high PD-L1 levels in both murine models and glioblastoma patient samples (Extended Data Fig. 4d–f), therefore probably contributing to immune suppression41–43 and immunotherapy resistance44,45, especially since glioblastoma cells did not express PD-L1 (Extended Data Fig. 4d,e). This evidence concerns the gene CD274 and glioblastoma.