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As defined by regulatory standards, pharmaceutical equivalents require generic drug products to have identical dosage forms and chemically identical active pharmaceutical ingredients (APIs). They must adhere to compendial or applicable standards for potency, content uniformity, disintegration times, and dissolution rates. In the case of modified-release dosage forms, variations in drug content are permissible as long as the delivered amount remains consistent with the innovator drug product.
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Sample size allocation in multiregional equivalence studies.

Jason J Z Liao1, Ziji Yu2, Yulan Li3

  • 1Merck & Co., Inc, North Wales, PA, USA.

Pharmaceutical Statistics
|June 19, 2018
PubMed
Summary
This summary is machine-generated.

Multiregional clinical trials (MRCTs) accelerate global drug approval. This study proposes two systematic approaches for optimal sample size allocation in multiregional equivalence trials.

Keywords:
consistencyequivalence trialmultiregional trialsample size allocation

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Area of Science:

  • Pharmacometrics and Biostatistics
  • Clinical Trial Design and Methodology
  • Regulatory Science in Drug Development

Background:

  • Multiregional clinical trials (MRCTs) are increasingly vital for global drug development, enabling simultaneous regulatory submissions and approvals across diverse regions.
  • The globalization of pharmaceutical research presents operational and scientific challenges, particularly in designing studies that meet varied regional requirements.
  • Effective sample size allocation within MRCTs is a critical, yet complex, aspect of study design, impacting statistical power and resource utilization.

Purpose of the Study:

  • To propose and evaluate systematic approaches for sample size partitioning in multiregional equivalence trials.
  • To address the challenge of optimizing sample size distribution across different regions within a global drug development program.
  • To provide methodologies that facilitate efficient and statistically sound MRCT designs.

Main Methods:

  • Development of two distinct systematic methodologies for sample size allocation in multiregional equivalence trials.
  • Application of numerical evaluations to assess the performance and characteristics of the proposed allocation approaches.
  • Illustration of the approaches using a case study involving a biosimilar trial.

Main Results:

  • The proposed systematic approaches offer structured frameworks for determining optimal sample size distribution across regions in equivalence trials.
  • Numerical evaluations demonstrate the practical implications and statistical properties of the different sample size allocation strategies.
  • The biosimilar trial example highlights the applicability and potential benefits of the presented methods in real-world drug development scenarios.

Conclusions:

  • The study provides valuable tools for optimizing sample size allocation in multiregional equivalence trials, enhancing global drug development efficiency.
  • Implementing systematic sample size partitioning can lead to more robust and resource-efficient MRCTs.
  • These approaches contribute to the scientific rigor and operational feasibility of conducting global clinical trials for drug approval.