1. Comparison of treatment effect between phase 2 and phase 3 trials in patients with inflammatory bowel disease.
- Author
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Wils P, Jairath V, Sands BE, Magro F, Reinisch W, Rubin D, Danese S, Baumann C, and Peyrin-Biroulet L
- Subjects
- Humans, Endoscopy, Clinical Trials, Phase III as Topic, Clinical Trials, Phase II as Topic, Inflammatory Bowel Diseases drug therapy, Colitis, Ulcerative diagnosis, Colitis, Ulcerative drug therapy, Colitis, Ulcerative pathology, Crohn Disease therapy, Biological Products therapeutic use
- Abstract
Background and Aims: The accumulation of multiple randomized controlled trials in the field of inflammatory bowel diseases provides an opportunity to compare treatment effects between phase 2 and 3 trials. We aimed to determine whether treatment effects observed in phase 3 investigating biologics and small molecule drugs differed from those in their preceding phase 2 trial., Methods: We first performed a review of phase 2 and phase 3 trials enrolling ulcerative colitis (UC) or Crohn's disease (CD) patients. We compared the percent overall success for key endpoints between phases (several phase 3 could be matched to a single phase 2 trial). Then, we compared the percent overall success in the matched phase 2 and 3 trials (ratio 1:1), and performed sensitivity analysis., Results: We identified 14 phase 2 (8 CD; 6 UC) and 24 phase 3 (13 CD; 11 UC) trials. In CD, the different analyses suggest that the percentage of overall success of clinical remission and clinical response was significantly higher in phase 2 than in phase 3 trials. In UC, the analyses suggest collectively that the percent of treatment effect seemed similar for clinical remission, clinical response and histologic outcomes between phases but with a lower percentage of overall success in phase 2 than in phase 3 trials for endoscopic endpoints., Conclusions: In UC, we observed a similar percentage of treatment effect for clinical and histologic outcomes between phase 2 and 3 trials but not for endoscopic outcomes. Whereas in CD, we showed a failure to reproduce similar results between phases. These results may help sponsors in the design of future drug development programs., (© 2023 The Authors. United European Gastroenterology Journal published by Wiley Periodicals LLC on behalf of United European Gastroenterology.)
- Published
- 2023
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