assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:0080706 IAO:0000115 A medulloblastoma that is characterized as a molecular subtype that is not associated with activation of the WNT pathway or sonic hedgehog (SHH) pathway and TP53 mutations are absent. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://pubmed.ncbi.nlm.nih.gov/30392813/""}]}"