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Qi, Yulan; Chan, Ming Liang; Mould, Diane R.; Larimore, Kevin; Fisheleva, Elena; Cherukuri, Anu; Day, Jonathan; Savarirayan, Ravi; Irving, Melita; Bacino, Carlos A.; Hoover-Fong, Julie; Ozono, Keiichi; Mohnike, Klaus; Wilcox, William R.; Bober, Michael B.; Henshaw, Joshua
Clinical pharmacokinetics, 05/2024, Volume: 63, Issue: 5Journal Article
Background and Objective Vosoritide is a recently approved therapy for achondroplasia, the most common form of disproportionate short stature, that has been shown to be well tolerated and effective in increasing linear growth. This study aimed to develop a population pharmacokinetic (PPK) model to characterize pharmacokinetics (PK) of vosoritide and establish a weight-band dosing regimen. Methods A PPK model was developed using data from five clinical trials in children with achondroplasia (aged 0.95−15 years) who received daily per-kg doses of vosoritide. The model was used to simulate expected exposures in children with a refined weight-band dosing regimen. Simulated exposure was compared with the observed exposure from the pivotal clinical trial to evaluate appropriateness of the weight-band dosing regimen. Results A one-compartment model with a change-point first-order absorption and first-order elimination accurately described PK of vosoritide in children with achondroplasia. Body weight was found to be a predictor of vosoritide’s clearance and volume of distribution. Additionally, it was observed that dosing solution concentration and duration of treatment influenced bioavailability. The weight-band dosing regimen resulted in simulated exposures that were within the range demonstrated to be well tolerated and effective in the pivotal clinical trial and showed improved consistency in drug exposure across the achondroplasia population. Conclusions The weight-band dosing regimen reduced the number of recommended dose levels by body weight and is expected to simplify dosing for children with achondroplasia and their caregivers. Clinical Trial Registration NCT02055157, NCT02724228, NCT03197766, NCT03424018, and NCT03583697.
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