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The reemergence of precursor lymphoblastic leukemia in childhood after a period of remission. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C7784\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C7784\' NCI Thesaurus)
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