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Inherent difficulties with active control equivalence studies

S Senn1

  • 1Medical Department, Pharmaceutical Division, CIBA-GEIGY AG, Basle, Switzerland.

Statistics in Medicine
|December 30, 1993
PubMed
Summary
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Active control equivalence studies (ACES) face unique challenges. Successful ACES may paradoxically undermine their own validity, indicating inherent problems beyond standard hypothesis testing.

Area of Science:

  • Biostatistics
  • Clinical Trial Design
  • Medical Research Methodology

Background:

  • Active control equivalence studies (ACES) are designed to demonstrate that a new treatment is not inferior to an established one.
  • Assessing the 'competence' of ACES is crucial for interpreting their results reliably.
  • Existing methodologies may not adequately address the specific challenges posed by ACES.

Purpose of the Study:

  • To investigate the role and implications of 'competence' in the context of active control equivalence studies.
  • To analyze the inherent problems associated with ACES using a simplified model.
  • To determine if standard statistical approaches, like swapping null and alternative hypotheses, can resolve issues in ACES.

Main Methods:

  • Development and application of a simple theoretical model.

Related Experiment Videos

  • Analysis of the logical consequences of successful trial outcomes within the model.
  • Comparison of ACES challenges with those of classical clinical trials.

    • Main Results:

    • The model demonstrates that successful ACES outcomes inherently raise questions about the study's competence.
    • The success of an ACES can, paradoxically, cast doubt on the validity of its findings.
    • The identified problems in ACES are more profound than those in traditional clinical trials.

    Conclusions:

    • ACES present significant methodological challenges that are not easily overcome.
    • The interpretation of ACES results requires careful consideration of the 'competence' issue.
    • Standard adjustments to hypothesis testing frameworks are insufficient to resolve fundamental problems within ACES.