FUT4 and medulloblastoma: In contrast, CD15 expression was increased in P17+ Ptch1lox/lox wild type mice (73.16+/-2.49%) compared to both P7 wild type GCPs (p = 0.002) and P17+ Ptch1lox/lox;GFAPcre medulloblastoma (p = 0.002, S4A Fig).