The results showed that the percentage of cells expressing ABCC8 in total tissue area (mean ± SD) was 3.9 ± 4 in glioblastoma, 4.1 ± 3.1 in brain metastasis, 8.2 ± 7.2 in medulloblastoma, 9.1 ± 7 in supratentorial ependymoma, and 8.1 ± 5.9 in the posterior cranial cavity. This evidence concerns the gene ABCC8 and medulloblastoma.