Göteborg, Sweden

Study to evaluate HZN-825 in patients with Diffuse Cutaneous Systemic Sclerosis (dcSSc)

This is a randomized, double-blind, placebo-controlled, repeat-dose, multicenter trial for HZN-825, a selective antagonist of lysophosphatidic acid receptor-1 (LPAR1). Participants will be screened within 4 weeks prior to the Baseline (Day 1) Visit. Approximately 300 participants who meet the trial eligibility criteria will be randomized on Day 1 in a 1:1:1 ratio to receive HZN-825 300 mg QD, HZN-825 300 mg BID or placebo for 52 weeks. Participants will take their first dose of trial drug at the clinic and will return to the clinic for trial visits at Week 4 and every 6 weeks thereafter until Week 52. Participants who complete the Double-blind Treatment Period (Week 52) may be eligible to enter a 52-week extension trial (HZNP- HZN-825-302). Participants not entering the extension will return to the clinic for a Safety Follow-up Visit 4 weeks after the last dose of trial drug.