title: Patient case involving high-dose methotrexate followed by leucovorin rescue.
mesh_terms: D000293:Adolescent; D004359:Drug Therapy, Combination; D005266:Femoral Neoplasms / Q000188:drug therapy; D006801:Humans; D002955:Leucovorin / Q000008:administration & dosage / Q000627:therapeutic use*; D008297:Male; D008727:Methotrexate / Q000008:administration & dosage / Q000627:therapeutic use*; D012516:Osteosarcoma / Q000188:drug therapy
chemical_list: D002955:Leucovorin; D008727:Methotrexate