Specifically, they were referred for these reasons: 3 cases for diagnostic workup with liquid CSF biopsy, 2 cases of glioma with mismatch repair deficiency, 2 cases of ependymoma, and 1 case each of glioma with H3K27M mutation, craniopharyngioma for intracystic interferon therapy, and low-grade glioma (LGG) with BRAF mutation. Here, BRAF is linked to central nervous system cancer.