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Pharmacokinetics and Pharmacodynamics of Oral Etoposide in Children With Relapsed or Refractory Acute Lymphoblastic Leukemia
by:In: J Clin Oncol, Vol. 21, Nr. 7
(2003)
, p. 1340-1346.
Abstract
Purpose: To study the pharmacokinetics and pharmacodynamics of once- versus twice-daily oral etoposide in children with relapsed or refractory acute lymphoblastic leukemia ALL. Patients and Methods: Fifty-eight patients were randomly assigned to etoposide at 50 mg/m2/d with once- versus twice-daily doses for 22 days. On day 8, vincristine, asparaginase, and dexamethasone were started. Etoposide pharmacokinetics and pharmacodynamics were studied for 47, 28, and 26 patients on day 1, 8, and 22, respectively, of remission reinduction therapy. Results: Of 48 patients with pharmacokinetic data, 42 87.5% achieved complete remission, three 6.3% failed to achieve remission, and three 6.3% died during induction. Median etoposide day 8 area under concentration-time curve AUC and cumulative AUC tended to be greater P = .06 and P = .07, respectively in patients n = 23 who achieved complete remission 24 and 522 micromol/L * h, respectively than in patients n = 3 who did not 14


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