title: High-dose methotrexate pharmacokinetics and outcome of children and young adults with osteosarcoma.
abstract: BACKGROUND
  High-dose methotrexate (HDMTX) is used frequently in combination regimens that include nephrotoxic chemotherapy. The authors evaluated the impact of factors such as age and prior nephrotoxic agents on MTX pharmacokinetics in children and young adults with osteosarcoma and examined whether MTX pharmacokinetic parameters were associated with outcome.
  
  
  METHODS
  The authors evaluated MTX pharmacokinetics in 140 patients who were treated with 1083 courses of HDMTX on 3 consecutive studies of multiagent chemotherapy at a single institution. The influence of MTX pharmacokinetics on the outcome of 107 patients with localized disease was examined.
  
  
  RESULTS
  Mean peak MTX concentrations > or = 1000 microM were achieved in 135 patients (96%). MTX clearance was decreased after cisplatin therapy (P = 0.01), after cisplatin in combination with ifosfamide therapy (P < 0.0001), and after MTX therapy (P = 0.003). In patients with localized osteosarcoma, a higher mean MTX area under the curve, a higher mean peak concentration of MTX, a longer mean time above a threshold concentration (500 microM), and a lower mean MTX clearance were associated with lower probability of event-free survival (EFS). Patients who had a mean peak MTX plasma concentration > 1500 microM were found to have a worse outcome (estimated 5-year EFS, 58.5% +/- 6.7%) compared with patients who had a mean peak concentration < or = 1500 microM (estimated 5-year EFS, 75.5% +/- 6.6%; P = 0.02).
  
  
  CONCLUSIONS
  When HDMTX (12 g/m(2)) was used with multiagent therapy for patients with osteosarcoma, very high MTX exposures were associated with poorer outcome. The prospective evaluation of MTX pharmacokinetics and their relation to outcome in a large study is warranted to further substantiate the current findings and to elucidate the causative mechanism.
authors.affiliation: Department of Pharmaceutical Sciences, St. Judes Children's Research Hospital, Memphis, Tennessee 38105, USA. kristine.crews@stjude.org
authors.forename: Kristine R
authors.initials: KR
authors.lastname: Crews
authors.forename: Tiebin
authors.initials: T
authors.lastname: Liu
authors.forename: Carlos
authors.initials: C
authors.lastname: Rodriguez-Galindo
authors.forename: Ming
authors.initials: M
authors.lastname: Tan
authors.forename: William H
authors.initials: WH
authors.lastname: Meyer
authors.forename: J Carl
authors.initials: JC
authors.lastname: Panetta
authors.forename: Michael P
authors.initials: MP
authors.lastname: Link
authors.forename: Najat C
authors.initials: NC
authors.lastname: Daw
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000964:Antimetabolites, Antineoplastic / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D001859:Bone Neoplasms / Q000188:drug therapy* / Q000473:pathology; D002648:Child; D002675:Child, Preschool; D002945:Cisplatin / Q000008:administration & dosage; D018572:Disease-Free Survival; D004305:Dose-Response Relationship, Drug; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D007069:Ifosfamide / Q000008:administration & dosage; D007674:Kidney Diseases / Q000139:chemically induced / Q000150:complications; D008297:Male; D008727:Methotrexate / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D012516:Osteosarcoma / Q000188:drug therapy* / Q000473:pathology; D016896:Treatment Outcome
chemical_list: D000964:Antimetabolites, Antineoplastic; D002945:Cisplatin; D007069:Ifosfamide; D008727:Methotrexate