A Study of CDX-0159 in Patients With Chronic Inducible Urticaria

The purpose of this study is to assess the clinical effect, the pharmacodynamics, the safety, and the pharmacokinetics of barzolvolimab in patients with Chronic Inducible Urticaria (Cold Urticaria [ColdU] or Symptomatic Dermographism [SD]) who remain symptomatic despite the use of H1-antihistamines.

There is a screening period of up to 4 weeks, followed by a 20-week treatment period where patients will receive either barzolvolimab 150mg, 300mg or placebo, and then a 24-week follow up period where all patients are observed.

Key inclusion criteria:

• Males and females, >/= 18 years of age.
• Diagnosis of chronic ColdU or SD >/= 3 months.
• Diagnosis of ColdU or SD despite the use of a stable regimen of second generation non-sedating H1-antihistamine as defined by:

• Recurrent pruritic wheals with or without angioedema due to ColdU or SD for >/= 6 weeks at any time prior to Visit 1 despite the use of H1-antihistamines.
• Must be on a stable regimen of second generation non-sedating H1-antihistamine for >/= 4 weeks prior to study treatment and agree to stay on through trial.
• UCT < 12 during the 14 days prior to treatment.
• Positive provocation test

• for ColdU patients: developing a wheal at the test site within 10 min after using TempTest® at any temperature at both screening (Visit 1) and randomization (Visit 3)
• for SD patients: developing a wheal at the test site within 10 min after using FricTest® with ≥ 3 pins at both screening (Visit 1) and randomization (Visit 3)
• Both males and females of child-bearing potential must agree to use highly effective contraceptives during the study and for 150 days after treatment.
• Willing and able to complete a daily symptom electronic diary and comply with study visits.

Key exclusion criteria:

• Women who are pregnant or nursing.
• Active Chronic spontaneous urticaria or other forms of CIndU besides ColdU or SD that may interfere with study assessments.
• Active, pruritic skin condition in addition to CIndU.
• Medical condition that would cause additional risk or interfere with study procedures.
• Known active HIV, hepatitis B or hepatitis C infection.
• Vaccination of a live vaccine within 2 months prior to study treatment (subjects must agree to avoid vaccination during the study). Inactivated vaccines are allowed such as seasonal influenza injection or COVID-19 vaccine.
• History of anaphylaxis

There are additional criteria that your study doctor will review with you to confirm you are eligible for the study.