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Immunohistochemistry staining of CD4, CD8, programed death 1 (PD-1), and CD45 expression in tumor-infiltrating lymphocytes in glioblastoma (GBM) tissue and peripheral blood mononuclear cells. Representative photomicrographs showing staining for CD4 (A), CD8 (B), PD-1 (C), and CD45 (D) in GBM histological tissue sections (400× magnification) and CD4 (E), CD8 (F), PD-1 (G), and CD45 (H) in peripheral blood mononuclear cell cytoblocks (400× magnification).
