Phase 1 Study of GTX-B001 Safety and Effects in Healthy Adults and Patients with Chronic Inducible Urticaria

What this Trial Is About

Researchers are evaluating GTX-B001, a humanized bispecific antibody targeting proteins on mast cells, in a first-in-human phase 1 study. The trial aims to assess the safety, pharmacokinetics, and pharmacodynamics of a single dose of GTX-B001. It includes both healthy adults and patients with chronic inducible urticaria, specifically cold urticaria and symptomatic dermographism, who remain symptomatic despite antihistamine treatment. This study is randomized, double-blind, and placebo-controlled. The study has two parts Part A enrolls up to 48 healthy participants in five ascending dose cohorts, and Part B enrolls 24 patients with chronic inducible urticaria in two ascending dose cohorts. Participants in both parts are randomly assigned to receive a single intravenous infusion of either GTX-B001 at various doses or a placebo of normal saline. The treatment is administered on Day 1 with follow-up visits extending up to 12 weeks after dosing. Participants will undergo up to 9 visits including screening over 4 weeks and follow-up assessments for 12 weeks post-treatment. Safety is monitored by tracking adverse events, while pharmacokinetics and pharmacodynamics of GTX-B001 are evaluated. For patients in Part B, preliminary efficacy on urticaria signs and symptoms is also assessed. The total participation period covers screening, treatment, and post-treatment monitoring to ensure thorough safety and response evaluation.

A Phase 1 Study of GTX-B001 in Healthy Subjects and Patients With Chronic Inducible Urticaria