Gallegos et al. evaluated [89Zr]-CD8 Immuno-PET imaging to monitor CD8-positive T-cell infiltration and predict survival outcomes in mouse models undergoing combination immunotherapy.29 Orthotopic syngeneic glioblastoma models treated with different therapies were utilized and longitudinal [89Zr]-CD8 PET imaging to quantify CD8-positive T-cell presence were conducted. This evidence concerns the gene CD8A and glioblastoma.