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Related Experiment Videos

Cost-efficient higher-order crossover designs in comparative bioavailability studies.

Jihao Zhou1, Ying Yuan, Rebecca Reynolds

  • 1Department of Clinical Biostatistics, Pfizer Global Research and Development, La Jolla Laboratories, San Diego, California, USA. zhau_JIHAO@Allergan.com

Clinical Pharmacokinetics
|May 25, 2006
PubMed
Summary

For drug clinical trials, the three-period two-sequence (D3 x 2) and four-period four-sequence (D4 x 4) crossover designs offer the best cost efficiency. The two-period four-sequence (D2 x 4) design is generally not recommended.

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Area of Science:

  • Pharmacokinetics and Drug Development
  • Clinical Trial Design
  • Biostatistics

Background:

  • Cost-efficiency is a critical consideration in planning drug clinical trials.
  • Higher-order crossover designs are increasingly favored in comparative bioavailability studies due to their statistical advantages.

Purpose of the Study:

  • To compare the cost efficiency of five common higher-order crossover designs.
  • To identify optimal designs for comparative bioavailability studies based on a defined cost function.

Main Methods:

  • Simulated multivariate normal data across various variability and correlation levels.
  • Employed Monte Carlo simulations and mixed-effects models to determine sample sizes.
  • Evaluated five designs: D2 x 4, D3 x 2, D3 x 4, D4 x 2, and D4 x 4, using US FDA bioequivalence criteria.

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Main Results:

  • No single crossover design demonstrated uniform cost-efficiency dominance.
  • The D3 x 2 and D4 x 4 designs exhibited superior overall cost efficiency in most scenarios.
  • The D2 x 4 design performed least effectively among the evaluated options.

Conclusions:

  • The D3 x 2 and D4 x 2 crossover designs are recommended for achieving cost efficiency at a specified power.
  • The D2 x 4 crossover design is generally unsuitable for comparative bioavailability studies.