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- W2996662021 abstract "Aims Fanconi anaemia (FA) is a rare disorder characterized by progressive bone marrow failure that requires haematopoietic cell transplantation (HCT). Busulfan is used in conditioning regimens prior to HCT. Doses used in non‐FA patients cause life‐threatening toxicities in FA patients and data on busulfan pharmacokinetics (PK) in this population are limited. This study characterized busulfan PK in paediatric FA patients using population PK modelling and evaluated the effect of body composition on steady‐state concentrations ( C ss ). Methods A total of 200 busulfan plasma concentrations in 29 FA patients from a recent study ( Clinicaltrials.gov ; NCT01082133) were available for population PK modelling. The effect of different body size‐scaled doses and body compositions on C ss was investigated using population PK modelling. Results Fat free mass (FFM) was identified as the best size descriptor in a two‐compartment busulfan PK model in FA patients. Conventional dosing, based on an amount of busulfan per kilogram of total body mass, resulted in higher C ss in FA patients with higher body mass index (BMI). A newly proposed FFM‐based dosing strategy would eliminate the observed trend of higher concentrations in high BMI patients, and achieve consistent C ss across a wide BMI spectrum. Conclusions This is the first study to describe the population PK of busulfan in paediatric FA patients. The proposed model will facilitate PK model‐informed precision dosing. FFM‐based dosing is expected to improve the probability of achieving target C ss , particularly in obese patients, while minimizing the risk of overdosing." @default.
- W2996662021 created "2019-12-26" @default.
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- W2996662021 date "2020-01-23" @default.
- W2996662021 modified "2023-09-26" @default.
- W2996662021 title "Population pharmacokinetic modelling of busulfan and the influence of body composition in paediatric Fanconi anaemia patients" @default.
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- W2996662021 doi "https://doi.org/10.1111/bcp.14202" @default.
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