Furthermore, given the galectin‐9 (Gal‐9)/T cell immunoglobulin and mucin‐domain containing‐3 (TIM‐3) pathway is gaining significant attention in cancer immunotherapy as an additional inhibitory checkpoint system, its expression in IDH‐mutant glioma was also examined by Sørensen et al. Here, LGALS9 is linked to central nervous system cancer.