Medulloblastoma (MB), a rare yet critical pediatric brain tumor, is divided into 4 molecular subgroups (WNT, SHH, Group 3, Group 4), each with distinct genetic profiles. Despite diagnostic and therapeutic advances, neurotoxicity from standard treatments (resection, radiotherapy, chemotherapy) and the need for long-term care remain challenges. CDK4/6 inhibitors (palbociclib, ribociclib, abemaciclib), approved for breast cancer, show potential in other tumors, but their efficacy in MB is unclear. Treatment resistance is a concern. This project aims to identify genetic markers of sensitivity to CDK4/6 inhibitors in MB, to improve therapies and overcome resistance.