Celldex Presents Data Demonstrating Profound Long Term Improvement in Angioedema in Barzolvolimab Phase 2 Study in Chronic Spontaneous Urticaria at EAACI 2025

Core Insights - Celldex Therapeutics announced that barzolvolimab significantly improves angioedema in chronic spontaneous urticaria (CSU) patients after 52 weeks of treatment [1][2][3] Group 1: Clinical Trial Results - The Phase 2 clinical trial met primary and secondary endpoints at 12 weeks, showing significant decreases in UAS7 scores compared to placebo [2][5] - At Week 52, an 86% mean reduction in angioedema activity was reported for the 150 mg Q4W group, and an 82% reduction for the 300 mg Q8W group [6] - 77% of patients treated with barzolvolimab who had angioedema at baseline were angioedema-free at Week 52 [5][6] Group 2: Patient Impact - The majority of patients with severe CSU experience painful angioedema, which significantly affects their quality of life [3][6] - 87% of patients reported clinically meaningful improvement in angioedema activity scores at Week 52 [6] Group 3: Drug Mechanism and Future Studies - Barzolvolimab is a humanized monoclonal antibody that targets the receptor tyrosine kinase KIT, which is involved in mast cell activation [4] - Celldex is conducting a global Phase 3 program for barzolvolimab in CSU, with enrollment currently underway [8]