TIGIT and glioblastoma: Protein levels of ICOS, TIGIT, and TNFRSF9, which were covered in our expanded 34 marker CyTOF panel (applied on a subset of 35 patients from our previous CyTOF analysis; 14 GBM.new, 7 GBM.rec, 14 GBM.pembro; n = 565,654 cells, Supp.