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Pharmacokinetics of doxorubicin in children with acute lymphoblastic leukemia: Multi-institutional collaborative study
University Children's Hospital, Uppsala, Sweden.
Karolinska Pharmacy, Karolinska Hospital, Stockholm, Sweden.
Björk, O., Department of Pediatric Oncology, Karolinska Hospital, Stockholm, Sweden.
Department of Pediatrics, Queen Silvias Child and Adolescent Hospital, Göteborg, Sweden.
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2002 (English)In: Medical and Pediatric Oncology, ISSN 0098-1532, E-ISSN 1096-911X, Vol. 38, no 5, 329-337 p.Article in journal (Refereed) Published
Abstract [en]

Background. In adults, it has been shown that the pharmacokinetics of doxorubicin are highly variable, despite standardization of the dose based on body surface area (BSA). The purpose of this study was to determine the plasma concentrations of doxorubicin and its active metabolite doxorubicinol in children treated for acute lymphoblastic leukemia (ALL). Procedure. Children, 107 in number, aged 1.3-17.3 years, were studied at Day 1 of induction therapy according to the current Nordic protocol. Five infants, 3-9 months old, were also included. Plasma samples were drawn 23 hr after the start of a 24-hr infusion of doxorubicin 40 mg/m2, and analyzed by reversed-phase liquid chromatography. Results. There was a more than 10-fold difference between patients in dose normalized plasma concentration of doxorubicin, median 62.8 ng/ml, range 22.6-334 ng/ml. The doxorubicin concentrations differed significantly between age groups (P= 0.003). Children aged 4-6 years had the highest doxorubicin concentrations, median 77.9 ng/ ml, followed by 2-4-year-old children, median 64.3 ng/ml. Both younger and older children had median values of about 50 ng/ml. Patients with white blood cell (WBC) count > 50 x 109/L at diagnosis had significantly lower doxorubicin concentrations, median 55.3 ng/ml, than those with WBC count < 10 x 109/L, median 64.4 ng/ ml (P=0.015). There was no difference in doxorubicin concentration between boys and girls. No correlation was found between doxorubicin levels and serum aminotransferases or serum creatinine. The concentration of doxorubicinol was 13% (median value) of that of doxorubicin. Four infants, 7-9 months old, had plasma clearance between 350-431 ml/ min/m2, which is in the same range as in older children. A 3-month-old infant had a clearance of 181 ml/min/m2. Conclusions. The age groups who had the highest doxorubicin concentrations, (2-) 4-6-year-old children, are known to make up a large proportion of standard risk ALL cases with good prognosis. The correlation between doxorubicin plasma levels and clinical effect needs further study. The influence of age, body composition, and tumor burden on the pharmacokinetics of antineoplastic drugs should also be further explored, aiming at improvements in the current dosing regimen based on BSA. © 2002 Wiley-Liss, Inc.

Place, publisher, year, edition, pages
2002. Vol. 38, no 5, 329-337 p.
Keyword [en]
Acute lymphoblastic leukemia, Anthracycline, Childhood cancer, Doxorubicin, Pharmacokinetics
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-47004DOI: 10.1002/mpo.10052OAI: diva2:267900
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2012-01-07

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