title: Mechanisms of drug resistance in human leukemia.
mesh_terms: D000970:Antineoplastic Agents / Q000627:therapeutic use*; D002460:Cell Line; D004351:Drug Resistance; D005784:Gene Amplification; D006801:Humans; D007938:Leukemia / Q000188:drug therapy* / Q000201:enzymology / Q000235:genetics; D008727:Methotrexate / Q000627:therapeutic use; D013762:Tetrahydrofolate Dehydrogenase / Q000235:genetics
chemical_list: D000970:Antineoplastic Agents; D013762:Tetrahydrofolate Dehydrogenase; D008727:Methotrexate