Study duration for group sequential clinical trials with censored survival data adjusting for stratification

Area of Science:

• Clinical Trials
• Biostatistics
• Survival Analysis

Background:

• Clinical trial duration is critical for sample size and event observation.
• Censored survival data presents unique challenges in trial design.
• Group sequential methods are essential for adaptive trial management.

Purpose of the Study:

• To propose a design procedure for determining study duration in group sequential clinical trials.
• To enable power calculations for trials with censored survival data.
• To adjust for unequal patient allocation and stratified randomization.

Main Methods:

• Utilizing a group sequential method based on the use function approach.
• Developing a procedure for calculating power and study duration.
• Incorporating adjustments for stratified randomization and unequal treatment allocation.

Main Results:

• A novel procedure for designing group sequential clinical trials with censored survival data.
• Methodology for calculating trial power and duration, accounting for key design factors.
• Demonstration of the procedure using a real-world clinical trial example.

Conclusions:

• The proposed procedure offers a robust framework for designing clinical trials with censored survival data.
• This methodology enhances the precision of power calculations and study duration determination.
• The approach is applicable to complex trial designs including unequal allocation and stratification.