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Children with brain tumors often carry germline mutations that have long been known to contribute to tumorigenesis and treatment response. However, less is known about how germline mutations may impact developmental and behavioral outcomes for children with tumors of the central nervous system (CNS). As the molecular mechanisms governing cancerous and normal tissue expand, we hypothesize that particular germline variants may impact baseline neurocognitive function and/or treatment-induced toxicities. In this preliminary study, 10 children on the Head Start 4 trial diagnosed with medulloblastoma were assessed for baseline adaptive functioning using the Adaptive Behavior Assessment System Third Edition (ABAS-III) and germline whole-exome sequencing was performed. After filtering for high impact variants, Welch’s T-tests were used to identify mutations associated with lower ABAS-III General …