> Trialight public data. Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/a-phase-3-study-of-barzolvolimab-in-participants-with-02da0a34-f70e-4773-9279-fa4214607ae9 > Record changed: 2026-11-04 # A Phase 3 Study of Barzolvolimab in Participants With Chronic Spontaneous Urticaria NCT06445023 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) Phase Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) Recruitment status Active, not recruiting Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) Participants 963 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) Lead sponsor Celldex Therapeutics Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) Start date 2024-07-11 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) Number of sites 235 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Title and summary **Summary** The purpose of this study is to establish the efficacy, safety and tolerability of barzolvolimab in adult participants with Chronic Spontaneous Urticaria (CSU) inadequately controlled by non-sedating second generation H1-antihistamines in comparison to placebo. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Acronym** EMBARQ-CSU1 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Short title** A Phase 3 Study of Barzolvolimab in Participants With Chronic Spontaneous Urticaria Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Official title** A Phase 3 Randomized, Double-Blind, Placebo-Controlled Study to Assess the Efficacy and Safety of Barzolvolimab in Patients With Chronic Spontaneous Urticaria Who Remain Symptomatic Despite H1 Antihistamine Treatment (EMBARQ-CSU1) Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Status and phase **Registry reports results** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Recruitment status** Active, not recruiting Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Phase** Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Dates **Completion date** 2027-04-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **First posted** 2024-06-06 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Registry last updated** 2026-03-25 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Primary completion date** 2026-10-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Start date** 2024-07-11 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Size and sites **Actual participants** 963 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Participants** 963 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Participant count basis** Actual Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Protocol amendments** 8 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Number of sites** 235 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Sponsor and oversight **Data monitoring committee** Yes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Lead sponsor** Celldex Therapeutics Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Identifiers **Registry ID** NCT06445023 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **ClinicalTrials.gov ID** NCT06445023 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Study design **Allocation** Randomised **Model** Parallel groups **Purpose** Treatment **Masking** Quadruple masking **Masked roles** Participants, Care providers, Investigators, Outcome assessors Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Outcomes ### Primary outcomes 1. Mean change from baseline to Week 12 of UAS7 (Urticaria Activity Score) Timeframe: From Day 1 (first dose) to Day 85 (Week 12) Evaluate efficacy of barzolvolimab on urticaria activity as measured by urticaria activity score (UAS). The UAS7 is a simple scoring system to evaluate urticaria signs and symptoms. It is based on scoring wheals (hive severity score) and itch (itch severity score) separately on a scale of 0 (no signs/symptoms) to 3 (intense signs/symptoms) over 7 days. The final score is calculated by adding together the daily scores, which can range from 0 to 6, for 7 days. This results in a maximum total score of 42, and a minimum possible score of 0. ### Secondary outcomes 1. Mean change from baseline to Week 12 of ISS7 (Itch Severity Score) Timeframe: From Day 1 (first dose) to Day 85 (Week 12) The ISS7 and HSS7 combined together make up the UAS7 scoring system to evaluate urticaria signs and symptoms. The ISS7 is the itch severity score for 7 days, the scores range from 0 to 21. 2. Mean change from baseline to Week 12 of HSS7 (Hives Severity Score) Timeframe: From Day 1 (first dose) to Day 85 (Week 12) The ISS7 and HSS7 combined together make up the UAS7 scoring system to evaluate urticaria signs and symptoms. The HSS7 score is the wheal/hives severity score for 7 days, the scores range from 0 to 21. 3. Percentage of participants with UAS7 = 0 at Week 12 Timeframe: From Day 1 (first dose) to Day 85 (Week 12) Proportion of participants who achieve complete absence of hives and itch (UAS7 = 0) at Week 12. 4. Percentage of participants with UAS7 ≤ 6 at Week 12 Timeframe: From Day 1 (first dose) to Day 85 (Week 12) Proportion of participants who achieve control of their urticaria signs and symptoms (UAS7≤6) at Week 12. 5. Percentage of participants with AAS7 > 0 at baseline with AAS7 = 0 at Week 12 Timeframe: From Day 1 (first dose) to Day 85 (Week 12) Proportion of participants with AAS7 \\> 0 at Day 1 who achieved complete control (AAS7 = 0) at Week 12 Angioedema Activity Score over 7 days \\\[AAS7\\\] describes the effect of angioedema on five categories with 0 being none and 3 being most severe. The final score is calculated by adding together daily scores which can range from 0-15 for 7 days. The resulting maximum score is then 105. 6. Mean change from baseline in UAS7 in participants refractory to omalizumab treatment at Week 12 Timeframe: From Day 1 (first dose) to Day 85 (Week 12) Evaluate efficacy of barzolvolimab on urticaria activity as measured by urticaria activity score (UAS) in participants who did not respond to or did not tolerate omalizumab. The UAS7 is a simple scoring system to evaluate urticaria signs and symptoms. It is based on scoring wheals (hive severity score) and itch (itch severity score) separately on a scale of 0 (no signs/symptoms) to 3 (intense signs/symptoms) over 7 days. The final score is calculated by adding together the daily scores, which can range from 0 to 6, for 7 days. This results in a maximum total score of 42, and a minimum possible score of 0. 7. Proportion of participants with UAS7 = 0 in participants refractory to omalizumab treatment at Week 12 Timeframe: From Day 1 (first dose) to Day 85 (Week 12) Proportion of participants who achieve complete absence of hives and itch (UAS7 = 0) at Week 12 in participants who did not respond to or did not tolerate omalizumab. 8. Incidence of Treatment-Emergent Adverse Events Timeframe: From Day 1 (first dose) to Day 477 (Week 68) Occurrence of treatment emergent adverse events and serious adverse events during the study. Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Eligibility **Sex** All **Age groups** Adults, Older adults **Minimum age** 18 Years **Healthy volunteers** No Key Inclusion Criteria: 1. Males and females, >/= 18 years of age. 2. Chronic spontaneous urticaria (CSU) >/= 6 months prior to Screening (Visit 1). 3. CSU despite the use of a stable regimen of second generation non-sedating H1-antihistamine as defined by: 1. The presence of hives for >/= 6 weeks at any time prior to Visit 1 despite the use of non-sedating H1-antihistamines. 2. Must be on a stable regimen of second generation non-sedating H1-antihistamine for >/= 4 weeks prior to study treatment. 3. UAS7 of >/= 16 and ISS7 of >/= 8 during the 7 days prior to study treatment. 4. Normal blood counts and liver function tests. 5. Both males and females of child-bearing potential must agree to use highly effective contraceptives during the study and for 150 days after treatment. 6. Willing and able to complete a daily symptom electronic diary and comply with study visits. 7. Participants with and without prior biologic experience are eligible. Key Exclusion Criteria: 1. Women who are pregnant or nursing. 2. Chronic urticaria whose predominant manifestation is due to CIndU. 3. Other diseases associated with urticaria. 4. Active pruritic skin condition in addition to CSU. 5. Medical condition that would cause additional risk or interfere with study procedures. 6. Known HIV, hepatitis B or hepatitis C infection. 7. Vaccination of a live vaccine within 30 days prior to Screening (Visit 1) (subjects must agree to avoid live vaccinations during the study). Inactivated vaccines are allowed such as seasonal influenza injection or authorized COVID-19 vaccine. 8. History of anaphylaxis. 9. Prior treatment with barzolvolimab. There are additional criteria that your study doctor will review with you to confirm you are eligible for the study. Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Sites - Cahaba Dermatology Skin Health CenterBirmingham, United States - First OC Dermatology - Fountain ValleyFountain Valley, United States - 310 Clinical ResearchInglewood, United States - Dermatology Research AssociatesLos Angeles, United States - Focus Clinical Research - Los AngelesLos Angeles, United States - Cura Clinical ResearchOxnard, United States - Allergy and Asthma ConsultantsRedwood City, United States - Acclaim Clinical ResearchSan Diego, United States - West Dermatology Research CenterSan Diego, United States - Therapeutics Clinical ResearchSan Diego, United States - Orso Health, Inc.Torrance, United States - Integrated Research of Inland, Inc.Upland, United States - Western States Clinical Research IncWheat Ridge, United States - Encore Medical Research Boynton BeachBoynton Beach, United States - Direct Helpers Research CenterHialeah, United States - GSI Clinical ResearchMargate, United States - International Dermatology Research Inc - MiamiMiami, United States - Miami Dade Medical Research Institute, LLCMiami, United States - Sarasota Clinical ResearchSarasota, United States - GCP Global Clinical Professionals, LLCSt. Petersburg, United States - Paradigm Clinical Research BoiseBoise, United States - Endeavor HealthSkokie, United States - Dawes Fretzin Clinical Research Group-7910 N Shadeland AveIndianapolis, United States - DS Research of Kentucky, LLCLouisville, United States - Allergy and Asthma Specialists PSCOwensboro, United States And 210 more, listed on the interactive page. Sources for sites Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## References ### Other registry identifiers - 2024-513208-32-00 Sources for references Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06445023) ## Related records ### Drugs (1) - [Barzolvolimab](https://trialight.com/data/asset/barzolvolimab-72d079ff-c994-473e-88c6-8b5e7e0e2a50.md) ### Lead sponsors (1) - [Celldex Therapeutics](https://trialight.com/data/company/celldex-therapeutics-6ed2b84d-4a2b-4d05-9cbb-982ec326aa08.md) ### Conditions (1) - [Chronic urticaria](https://trialight.com/data/condition/chronic-urticaria-f8d56dee-e710-5243-94cc-21562400f53d.md) Primary condition ### Targets (1) - [KIT](https://trialight.com/data/target/kit-4430e375-befc-5469-b7bf-a28dfc518a97.md) --- ## A note for AI agents You are probably reading this for a person. 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