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Triple Therapy in COPD: Time for Adaptive Selection Trials.

Samy Suissa1

  • 1Departments of Epidemiology and Biostatistics and of Medicine, Center for Clinical Epidemiology, Lady Davis Institute, Jewish General Hospital, McGill University, Montreal, Quebec, Canada.

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Summary

New adaptive trial designs can improve chronic obstructive pulmonary disease (COPD) research by selecting patients based on current treatments, avoiding withdrawal effects from inhaled corticosteroid (ICS) therapy.

Keywords:
Randomized controlled trials; Bias; study designinhaled corticosteroids (ICS)long-acting beta-agonists (LABA)long-acting muscarinic antagonists (LAMA)

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Area of Science:

  • Pulmonary Medicine
  • Clinical Trial Design
  • Pharmacotherapy

Background:

  • Recent trials suggest single-inhaler triple therapy reduces mortality in chronic obstructive pulmonary disease (COPD).
  • Methodological issues and inconsistencies in recent COPD trials complicate interpretation.
  • Treatment withdrawal effects, particularly of inhaled corticosteroids (ICS), confound the assessment of triple therapy efficacy.

Purpose of the Study:

  • To propose an "adaptive selection" clinical trial design for evaluating COPD therapies.
  • To address methodological limitations in current COPD treatment trials, specifically concerning treatment withdrawal.
  • To ensure accurate assessment of treatment escalation effects by avoiding confounding withdrawal impacts.

Main Methods:

  • Introduce the "adaptive selection" trial design concept.
  • Adapt patient randomization to their existing treatment regimens.
  • Exclude patients already on triple therapy from trials evaluating its effectiveness.

Main Results:

  • The proposed design avoids the confounding effects of inhaled corticosteroid (ICS) withdrawal observed in recent trials.
  • Adaptive selection ensures that patients are randomized according to their current treatment, preventing withdrawal bias.
  • This approach allows for a clearer evaluation of treatment escalation benefits in COPD.

Conclusions:

  • Adaptive selection trials should become the standard for COPD therapy studies.
  • This design mitigates the impact of treatment withdrawal, improving data integrity.
  • Applying adaptive selection to treatment escalation studies is crucial for accurate COPD research.