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- W3022650653 abstract "Recently, phase II trials with multiple schedules (frequency of administrations) have become more popular, for instance in the development of treatments for atopic dermatitis. If the relationship of the dose and response is described by a parametric model, a simplistic approach is to pool doses from different schedules. However, this approach ignores the potential heterogeneity in dose-response curves between schedules. A more reasonable approach is the partial pooling, i.e. certain parameters of the dose-response curves are shared, while others are allowed to vary. Rather than using schedule-specific fixed-effects, we propose a Bayesian hierarchical model with random-effects to model the between-schedule heterogeneity with regard to certain parameters. Schedule-specific dose-response relationships can then be estimated using shrinkage estimation. Considering Emax models, the proposed method displayed desirable performance in terms of the mean absolute error and the coverage probabilities for the dose-response curve compared to the complete pooling. Furthermore, it outperformed the partial pooling with schedule-specific fixed-effects by producing lower mean absolute error and shorter credible intervals. The methods are illustrated using simulations and a phase II trial example in atopic dermatitis. A publicly available R package, texttt{ModStan}, is developed to automate the implementation of the proposed method (href{https://github.com/gunhanb/ModStan}{https://github.com/gunhanb/ModStan})." @default.
- W3022650653 created "2020-05-13" @default.
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- W3022650653 date "2020-12-23" @default.
- W3022650653 modified "2023-09-23" @default.
- W3022650653 title "Shrinkage Estimation for Dose–Response Modeling in Phase II Trials With Multiple Schedules" @default.
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- W3022650653 doi "https://doi.org/10.1080/19466315.2020.1850519" @default.
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