These molecular subgroups include medulloblastoma, WNT-activated (a); medulloblastoma, sonic hedgehog [SHH]-activated and TP53 wild-type (b); medulloblastoma, SHH-activated and TP53-mutant (c); and medulloblastoma, non-WNT/non-SHH (d). This evidence concerns the gene TP53 and medulloblastoma.