Background
Medulloblastoma is the most common childhood brain tumor. It arises in the cerebellum, the part of the brain that controls coordination and movement. The standard treatment regimen consists of surgery, followed by a combination of intensive radiation and chemotherapy. Radiation therapy of the central nervous system in children is associated with severe side effects, including impaired cognitive function, neuroendocrine dysfunctions and secondary cancers. Currently, there is no treatment for resistant or relapsing tumors.