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Design and analysis of dose-finding studies combining multiple comparisons and modeling procedures.

José Pinheiro1, Björn Bornkamp, Frank Bretz

  • 1Biostatistics and Statistical Reporting Department, Novartis Pharmaceuticals, East Hanover, New Jersey 07936, USA. jose.pinheiro@novartis.com

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Summary

This study introduces a unified strategy for designing and analyzing dose-finding studies. It combines multiple comparison and modeling approaches for effective proof-of-concept testing and dose selection in clinical development.

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Area of Science:

  • Pharmacometrics
  • Clinical Trial Design
  • Biostatistics

Background:

  • Dose-finding studies are critical for clinical product development, involving complex decisions on efficacy proof and dose selection.
  • Current methods often separate proof-of-concept testing from dose selection, potentially leading to suboptimal strategies.

Purpose of the Study:

  • To present a unified, multi-stage strategy for designing and analyzing dose-finding studies.
  • To integrate proof-of-concept testing with dose selection within a single methodological framework.
  • To provide practical guidance on implementing this methodology, including sample size determination and prior value elicitation.

Main Methods:

  • A multi-stage procedure combining multiple comparison and modeling approaches.
  • Stage 1: Proof-of-concept testing using multiple comparisons to identify significant contrasts for candidate models.
  • Subsequent stages: Utilizing the best model from Stage 1 for dose selection, supported by power calculations and sensitivity analyses.

Main Results:

  • The proposed methodology offers a structured approach to dose-finding, enhancing decision-making in clinical development.
  • Practical considerations for sample size, power calculations, and incorporating prior clinical knowledge are detailed.
  • Sensitivity analyses are presented to evaluate the impact of parameter misspecification.

Conclusions:

  • The unified strategy provides a robust framework for optimizing dose-finding studies.
  • Implementation guidance and real-world application through a phase II anti-anxiety compound study are demonstrated.
  • This approach facilitates more informed decisions regarding treatment efficacy and dose selection for further development.