title: Clinical trials renew interest in old drug for children with leukemia.
mesh_terms: D000630:Aminopterin / Q000627:therapeutic use*; D002648:Child; D002985:Clinical Protocols; D005493:Folic Acid Antagonists / Q000627:therapeutic use*; D006801:Humans; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000188:drug therapy*; D014481:United States
chemical_list: D005493:Folic Acid Antagonists; D000630:Aminopterin