In previous studies, PD‐L1 (programmed death ligand 1),8 TIM3 (T‐cell immunoglobulin mucin‐3),9 and IDO1 (indoleamine 2,3‐dioxygenase 1)10 transcript levels were strongly correlated with immune responses and prognosis in gliomas. Here, HAVCR2 is linked to central nervous system cancer.