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Group sequential designs for three-arm 'gold standard' non-inferiority trials with fixed margin
Patrick Schlömer1, Werner Brannath
1Department of Mathematics, University of Bremen, Bremen, Germany.
Statistics in Medicine
|August 24, 2013
Summary
This study introduces group sequential designs for three-arm noninferiority trials, significantly reducing placebo group sizes and overall sample size. These designs offer ethical advantages and cost savings through potential early trial termination.
Area of Science:
- Clinical Trials Methodology
- Biostatistics
- Pharmaceutical Research
Background:
- Three-arm noninferiority trials (test treatment, active control, placebo) are recommended by regulatory authorities.
- Minimizing placebo group size is ethically desirable and can reduce trial costs.
Purpose of the Study:
- To develop and evaluate group sequential designs for three-arm noninferiority trials.
- To minimize sample sizes, particularly for the placebo arm, while maintaining trial integrity.
Main Methods:
- Overview of fixed sample size designs for three-arm noninferiority trials with normally distributed outcomes.
- Derivation of an optimal single-stage design as a benchmark.
- Development and analysis of group sequential designs with varying rejection boundaries.
Main Results:
- The optimal single-stage design allocates a substantially low number of patients to the placebo group.
- Group sequential designs further reduce expected sample sizes compared to the optimal single-stage design.
- Designs with different rejection boundaries exhibit varied operating characteristics.
Conclusions:
- Group sequential designs offer improvements over optimal single-stage designs for three-arm noninferiority trials.
- These designs lead to significant cost and time savings.
- Early termination of the placebo arm is a key advantage, addressing ethical concerns.
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