Provided are methods and compositions for treating an individual who has a medulloblastoma. Methods for treating an individual who has a medulloblastoma tumor can include a step of administering to the individual, at a dose sufficient to reduce the size and/or growth rate of the medulloblastoma tumor, a composition that includes a casein kinase II (CK2) inhibitor (e.g., a CK2-selective inhibitor such as CX-4945). In some cases, the medulloblastoma tumor is a hedgehog-dependent medulloblastoma tumor. In some cases, the medulloblastoma tumor is a hedgehog-independent medulloblastoma tumor. In some cases, the medulloblastoma tumor is smoothened inhibitor-resistant (SMO inhibitor-resistant). In some cases, the medulloblastoma is resistant to treatment with 4,5,6,7-tetrabromo-2H-benzotriazole (TBB). In some cases, the dose is sufficient to cause long term regression of the medulloblastoma tumor, and in some cases, the dose is sufficient to increase the chance of survival of the individual.