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• W2122560466 abstract "Despite its important role in cancer treatment, there is currently very limited available information concerning the clinical pharmacology of actinomycin D (Act D). The study was designed to characterise Act D pharmacokinetics and investigate the impact of pharmacogenetic variation on Act D disposition in children with cancer.A total of 650 plasma samples collected over an 8 year period from 117 patients ≤21 years receiving Act D (0.4-1.6 mg/m(2)) were used to characterise a population pharmacokinetic model. Polymorphisms in ABCB1 were analysed in 140 patients.A 3-compartment model provided a good fit to the data. Median values for Act D clearance and volume of distribution in the central compartment (V 1) obtained from the model were 5.3 L/h and 1.9 L (13.9 L/h/70 kg and 7.5 L/70 kg), respectively. There was substantial inter-subject variation in all pharmacokinetic parameters (coefficients of variation 53-81 % for non-normalised values). Body weight was a major determinant of Act D clearance, such that dose capping at 2 mg in larger children at a protocol dose of 1.5 mg/m(2) resulted in significantly lower area under the plasma concentration-time curves (mean AUC values: 9.3 versus 12.8 mg·min/L; P < 0.0001). No significant relationships were found between ABCB1 genetic variants and Act D pharmacokinetic parameters, nor between CL, V 1 or dose and incidence of grade 3 or 4 toxicity.We have defined the pharmacokinetics of Act D in a paediatric patient population, providing robust estimates of key pharmacokinetic parameters. Pharmacokinetic data bring into question the current clinical practice of dose capping at 2 mg in larger patients. Pharmacogenetic variation in candidate drug transporter genes identified from preclinical studies does not significantly impact on Act D exposure in a clinical setting." @default.
• W2122560466 created "2016-06-24" @default.
• W2122560466 creator A5013139347 @default.
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• W2122560466 date "2014-06-27" @default.
• W2122560466 modified "2023-10-06" @default.
• W2122560466 title "Characterisation of the Clinical Pharmacokinetics of Actinomycin D and the Influence of ABCB1 Pharmacogenetic Variation on Actinomycin D Disposition in Children with Cancer" @default.
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• W2122560466 doi "https://doi.org/10.1007/s40262-014-0153-2" @default.
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