title: High-dose methotrexate, not a conventional treatment.
mesh_terms: D004359:Drug Therapy, Combination; D006801:Humans; D002955:Leucovorin / Q000627:therapeutic use; D008727:Methotrexate / Q000008:administration & dosage*; D012516:Osteosarcoma / Q000188:drug therapy*; D012107:Research Design
chemical_list: D002955:Leucovorin; D008727:Methotrexate