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Corbus Pharmaceuticals Reports Results from Phase 1a Study of CB1 Inverse Agonist CRB-913 for the Treatment of Obesity

Corbus Pharmaceuticals Holdings Inc. (CRBP) | December 11, 2025

By Fiona Wilson

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Corbus Pharmaceuticals announced the results from the Phase 1a study of CRB-913, showing a favorable safety profile and evidence of weight loss in participants with obesity.

CRB-913 demonstrated safety and tolerability across all doses studied.

Participants on CRB-913 experienced a placebo-adjusted mean weight loss of 2.9% at Day 14 in the dedicated cohort of people with obesity.

Safety Profile

CRB-913 was safe and well-tolerated with no serious adverse events reported in the study.

Weight Loss Effect

Participants treated with CRB-913 experienced a mean 2.9% placebo-adjusted weight loss by Day 14, showing promising results for obesity management.

Neuropsychiatric Assessments

Daily neuropsychiatric assessments using CSSRS, PHQ-9, and GAD-7 were negative for all participants, indicating stable mental health during the study.

  • CRB-913's observed weight loss effect and safety profile provide promising evidence for its potential as a treatment for obesity.
  • The initiation of the Phase 1b dose-range finding study 'CANYON-1' signifies the company's commitment to further evaluate CRB-913 in obesity management.

The Phase 1a study results demonstrate the safety and efficacy of CRB-913 in promoting weight loss in participants with obesity, paving the way for future developments in chronic obesity management.