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Updated: Apr 29, 2026
Author Spotlight: Methodologies and Advancements of Chronic Pain Management Research
Published on: January 5, 2024
Research designs for proof-of-concept chronic pain clinical trials: IMMPACT recommendations
Jennifer S Gewandter1, Robert H Dworkin, Dennis C Turk
1University of Rochester, Rochester, NY, USA University of Washington, Seattle, WA, USA University of Kiel, Kiel, Germany Metrum Research Group, Tariffville, CT, USA Queen's University, Kingston, Ontario, Canada Analgesic Solutions, Natick, MA, USA Tufts University, Boston, MA, USA Cytel, Boston, MA, USA Johns Hopkins University, Baltimore, MD, USA CRP Santé, Strassen, Luxembourg CP Taylor Consulting, Ann Arbor, MI, USA American Chronic Pain Association, Rocklin, CA, USA Desjardins Associates and Rutgers University, Newark, NJ, USA Allergan, Irvine, CA, USA East Carolina University, Greenville, NC, USA University of Pennsylvania, Philadelphia, PA, USA Merck, Blue Bell, PA, USA Eli Lilly, Indianapolis, IN, USA Virtuous Pharma, Inc., Raleigh-Durham, NC, USA University of Helsinki, Helsinki, Finland VA Connecticut Healthcare System, West Haven, CT, USA Richard L Leff MD LLC, Chadds Ford, PA, USA Stanford University, Stanford, CA, USA California Pacific Medical Center, San Francisco, CA, USA Voyager Therapeutics, Cambridge, MA, USA Johnson and Johnson, Raritan, NJ, USA Imperial College, London, UK Faculdade de Medicina de Lisboa, Lisbon, Portugal University of Southern Denmark, Odense, Denmark Alpharma, Piscataway, NJ, USA Grünenthal GMbH, Aachen, Germany GlaxoSmithKline, Research Triangle Park, NC, USA Jazz Pharmaceuticals, Palo Alto, CA, USA Heidelberg University, Mannheim, Germany University of California San Diego, San Diego, CA, USA Endo Pharmaceuticals, Chadds Ford, PA, USA.
Designing effective proof-of-concept (POC) clinical trials is crucial for advancing novel pain treatments. This consensus meeting focused on optimizing POC trial designs for analgesia to ensure efficient and powerful evaluations.
Area of Science:
- Clinical Trial Design
- Pharmacology
- Pain Management
Background:
- Proof-of-concept (POC) trials are essential for evaluating novel treatments and determining efficacy in broader patient populations.
- A key challenge in POC trial design is obtaining sufficient data for go/no-go decisions cost-effectively.
- The IMMPACT consensus meeting addressed design considerations for POC trials in analgesia, focusing on resource and participant limitations.
Purpose of the Study:
- To discuss and provide recommendations for optimizing the design of proof-of-concept clinical trials in analgesia.
- To maximize statistical power and efficiency within limited resources and participant numbers for POC trials.
- To improve the selection of efficacious pain treatments for confirmatory trials and reduce the evaluation of ineffective ones.
Main Methods:
- Review of general design aspects: patient population, comparators, placebo use, study power, and pharmacokinetic-pharmacodynamic relationships.
- Evaluation of single-dose study efficiency for rapid-onset treatments.
- Summary of trade-offs between parallel-group and crossover designs; assessment of N-of-1, enriched, adaptive, and sequential parallel comparison designs.
Main Results:
- Discussion of strategies to maximize power with limited resources in POC analgesia trials.
- Comparison of different trial designs, highlighting advantages and disadvantages for POC studies.
- Recommendations for efficient and powerful POC trial designs in chronic pain treatment development.
Conclusions:
- Optimized POC trial designs are critical for efficient drug development in pain management.
- Careful consideration of design elements can enhance the likelihood of advancing truly efficacious treatments.
- Improved POC trial strategies can reduce the progression of ineffective pain therapies.
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