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Flexible designs for pivotal clinical trials Vlad Dragalin, RSU-SDS-BDS-GSK FDA/Industry Workshop Session: Flexible Designs – Are We Ready Yet? Washington, D.C., September 14-16, 2005
Declaimer ,[object Object],[object Object],[object Object]
Acknowledgment ,[object Object],[object Object],[object Object]
Outline ,[object Object],[object Object],[object Object],[object Object]
What are Adaptive Designs? ,[object Object],[object Object],[object Object],PROTOCOL AMENDMENTS
General Structure of Adaptive Designs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Adaptive Design Process Decision Rule New  Patient Sampling Rule Stopping Rule Allocation Rule Data
GSK Experience ,[object Object],[object Object],[object Object],[object Object],[object Object]
Background ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Study Designs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Team Concerns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Details of the Design Primary Endpoint: Primary Goal: Target Difference: STDeviation: Type I error: Power: Traditional Dsgn: Adaptive Dsgn: Efficacy Bndry: Futility Bndry: Inflation Factor: PI-NRS change from Baseline at 8 th W of treatment  Comparison of three SBx doses (LD, MD, HD) with Plb 1.3 units 2.1 units    = 0.05 (adjustment for multiplicity    = 0.05/3 = 0.017)  90% 4 parallel groups - 72 patients/per arm (total 288) 3 stage inverse-normal combination test O’Brien-Fleming type  nominal levels: (0.0006, 0.014, 0.0235) nominal levels: (0.5, 0.5) 1.025 - maximum 75 patients/arm
1 2 3 4 11 5 6 7 8 9 10 Month Enrollment Period 1st Stage Data Plb MD LD HD 3rd IA 2nd IA 1st IA Randomization  CRO 0 8w 2w 1st Stage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Timing by 80% CP GSK  Steering  Committee
1 2 3 4 11 5 6 7 8 9 10 Month Enrollment Period 1st Stage Data Plb MD HD 3rd IA 2nd IA 1st IA Randomization  CRO 0 8w 2w 2nd Stage 2nd Stage Data GSK Steering Committee ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
1 2 3 4 11 5 6 7 8 9 10 Month Enrollment Period 1st Stage Data Plb MD 3rd IA 2nd IA 1st IA Randomization  CRO 0 8w 2w 3rd Stage 2nd Stage Data GSK Steering Committee 3rd Stage Data ,[object Object],[object Object],[object Object],[object Object]
Interim Analyses: Data For each arm at each stage
Interim Analyses: Test Null Hypothesis: Estimate of mean 8 th W endpoint: Standardized Test Statistics: Reduced Variance:
Multiplicity Adjustment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Design Properties Parallel 4 arm Dsgn:  72 per arm
Points to Consider ,[object Object],[object Object],[object Object],[object Object],[object Object]
Points to Consider ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Dragalin Flexible Design

  • 1. Flexible designs for pivotal clinical trials Vlad Dragalin, RSU-SDS-BDS-GSK FDA/Industry Workshop Session: Flexible Designs – Are We Ready Yet? Washington, D.C., September 14-16, 2005
  • 2.
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  • 6.
  • 7. Adaptive Design Process Decision Rule New Patient Sampling Rule Stopping Rule Allocation Rule Data
  • 8.
  • 9.
  • 10.
  • 11.
  • 12. Details of the Design Primary Endpoint: Primary Goal: Target Difference: STDeviation: Type I error: Power: Traditional Dsgn: Adaptive Dsgn: Efficacy Bndry: Futility Bndry: Inflation Factor: PI-NRS change from Baseline at 8 th W of treatment Comparison of three SBx doses (LD, MD, HD) with Plb 1.3 units 2.1 units  = 0.05 (adjustment for multiplicity  = 0.05/3 = 0.017) 90% 4 parallel groups - 72 patients/per arm (total 288) 3 stage inverse-normal combination test O’Brien-Fleming type nominal levels: (0.0006, 0.014, 0.0235) nominal levels: (0.5, 0.5) 1.025 - maximum 75 patients/arm
  • 13.
  • 14.
  • 15.
  • 16. Interim Analyses: Data For each arm at each stage
  • 17. Interim Analyses: Test Null Hypothesis: Estimate of mean 8 th W endpoint: Standardized Test Statistics: Reduced Variance:
  • 18.
  • 19. Design Properties Parallel 4 arm Dsgn: 72 per arm
  • 20.
  • 21.