Model-Based Assessment of Alternative Study Designs in Pediatric Trials. Part I: Frequentist Approaches

Area of Science:

• Clinical Pharmacology
• Biostatistics
• Pediatric Research

Background:

• Classical parallel designs (PaD) present feasibility challenges in pediatric clinical trials.
• Alternative trial designs may enhance the efficiency and practicality of pediatric studies.

Purpose of the Study:

• To compare the feasibility of alternative pediatric trial designs against classical parallel designs using a model-based simulation approach.
• To evaluate sequential, crossover, and randomized withdrawal (RWD) designs relative to PaD.

Main Methods:

• A pharmacometric framework utilizing clinical trial simulations.
• Comparison of study designs based on type I/II errors, sample size (SS), trial duration (TD), treatment exposures, and parameter estimate precision (EP).

Main Results:

• Crossover designs require the lowest SS and TD but involve higher placebo/no treatment exposure.
• Randomized withdrawal (RWD) designs maximize active treatment exposure, minimize placebo exposure, but necessitate the largest SS.
• Sequential designs can achieve smaller SS than crossover designs, albeit with reduced parameter estimate precision (EP).

Conclusions:

• Alternative designs, particularly crossover and RWD, offer distinct advantages for pediatric trial feasibility.
• The presented pharmacometric framework enables a comprehensive, multiscale comparison to guide optimal pediatric trial design selection.