title: Pharmacokinetic monitoring of intravenous cyclosporine A in pediatric stem-cell transplant recipients. The trough level is not enough.
abstract: In order to monitor CsA serum levels after SCT, trough levels (C0) are widely used. The aim of this study was to estimate the population and individual PK parameters for patients receiving intravenous CsA after SCT. In 27 pediatric patients after SCT receiving CsA (3 mg/kg/day) every 12 h, a total of 289 CsA concentrations was obtained. To describe the PK parameters of CsA, a two-compartment model with first order elimination was used. Covariate analysis identified body weight, age, and the co-administration with itraconazole and tobramycine as factors influencing the Cl. The statistical comparison of AUC, trough level, and C2 indicates a correlation between AUC and C2, but no correlation between the AUC and C0, r = 0.24 (p = 0.146) vs. r = 0.526 (p = 0.000692), respectively. Our results underscore the fact that CsA trough levels do not reflect the drug exposure in patients receiving intravenous CsA after SCT. By contrast, CsA blood levels measured 2-6 h after CsA infusion showed a better correlation with the AUC. Our data provide new information to optimize the balancing act between GvHD-prophylaxis, graft vs. leukemia effect, and CsA side-effects after SCT.
authors.affiliation: Department of Pediatric Hematology and Oncology, Children's Hospital, Medical University, Kiel, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Schrauder
authors.forename: S
authors.initials: S
authors.lastname: Saleh
authors.forename: K W
authors.initials: KW
authors.lastname: Sykora
authors.forename: H
authors.initials: H
authors.lastname: Hoy
authors.forename: K
authors.initials: K
authors.lastname: Welte
authors.forename: J
authors.initials: J
authors.lastname: Boos
authors.forename: G
authors.initials: G
authors.lastname: Hempel
authors.forename: L
authors.initials: L
authors.lastname: Grigull
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D016572:Cyclosporine / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics* / Q000627:therapeutic use; D016903:Drug Monitoring; D005260:Female; D006086:Graft vs Host Disease / Q000517:prevention & control*; D006801:Humans; D007166:Immunosuppressive Agents / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics* / Q000627:therapeutic use; D007223:Infant; D007262:Infusions, Intravenous; D008297:Male; D033581:Stem Cell Transplantation; D055815:Young Adult
chemical_list: D007166:Immunosuppressive Agents; D016572:Cyclosporine