_:vb50941394 . _:vb50941394 . _:vb50941394 . _:vb50941394 . _:vb50941394 "url:https://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&ns=ncit&code=C130039"^^ . _:vb50941394 "A B-lymphoblastic leukemia/lymphoma that is characterized by amplification of a portion of chromosome 21."^^ .