query: SELECT ?item ?itemLabel
  
    WHERE {
  
     ?item p:P921 ?subject .
     ?subject ps:P921 wd:Q7315926 .  # atypical teratoid rhabdoid tumor
     FILTER EXISTS {
       	?subject prov:wasDerivedFrom ?reference.
          ?reference pr:P248 wd:Q180686.
                    }
  
     SERVICE wikibase:label {bd:serviceParam wikibase:language "en"}
         }