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A unified theory for sequential clinical trials.

¹Medical and Pharmaceutical Statistics Research Unit, The University of Reading, Reading, RG6 6FN, U.K.

Statistics in Medicine

|September 4, 1999

Summary

Sequential clinical trials, increasingly used in research, offer advanced methods for interim data analysis. This paper unifies the theory, design, and analysis of these trials, clarifying existing approaches.

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Area of Science:

Clinical Trials Methodology
Biostatistics
Pharmaceutical Research

Background:

Sequential clinical trial methodology is well-developed.
Implementation is growing in both pharmaceutical and public sectors.
Frequentist interpretation of interim analyses is understood.

Purpose of the Study:

Present the principles of sequential clinical trial design and analysis.
Review existing methods and clarify their relationships.
Highlight controversies and gaps in current methodology.

Main Methods:

Review of established sequential trial design principles.
Analysis of various stopping boundary calculation methods.
Examination of approaches for terminal analysis.

Main Results:

A unified theoretical framework for sequential trials is presented.
Existing methods are contextualized within general principles.
Key areas of debate and research needs are identified.

Conclusions:

A comprehensive understanding of sequential trial design and analysis is facilitated.
The unified theory aims to improve appreciation of core features.
Further research is guided by highlighted controversies and gaps.

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