PTPRC and glioblastoma: Concordantly, flow cytometry revealed a small number of CD3+ lymphocytes in a representative cohort of DIPG samples compared to adult GBM samples (DIPG: 1.72–2.65% of total CD45+ leukocytes; adult GBM: 7.09–50.2%; normal cortex: 0.26–1.97%; Fig. 2d-f).