An Open-label Extension Trial of HZNP-HZN-825-301 in Adult Participants With Diffuse Cutaneous Systemic Sclerosis (Diffuse Cutaneous SSc)
Primary Objectives:1. The primary efficacy objective is to assess the efficacy of 52 weeks of open-label treatment with HZN-825 in participants with diffuse cutaneous systemic sclerosis, as measured by change from both baselines in forced vital capacity percent (FVC %) predicted. 2. The primary safety objective is to examine the safety and tolerability of 52 weeks of open-label treatment with HZN-825, inclusive of, but not limited to, adverse events (AEs), serious AEs (SAEs) and the adverse event of special interest (AESI), from Day 1 to 4 weeks after last dose.
Key Inclusion Criteria:
- Completed the double-blind Treatment Period (Week 52) in Trial HZNP-HZN-825-301; participants prematurely discontinued from trial drug in Trial HZNP-HZN-825-301 for reasons other than safety or toxicity can be included at the discretion of the Investigator after completing Trial HZNP-HZN-825-301 scheduled visits, including Week 52 assessments.
Key Exclusion Criteria:
- Anticipated use of another investigational agent for any condition during the course of the trial.
- New diagnosis of malignant condition after enrolling in Trial HZNP-HZN-825-301 (except successfully treated basal/squamous cell carcinoma of the skin or cervical cancer in situ).
- Women of childbearing potential (WOCBP) or male participants not agreeing to use highly effective method(s) of birth control throughout the trial and for 4 weeks after last dose of trial drug as defined in the protocol.
- Any new development with the participant's disease or condition or any significant laboratory test abnormality during the course of Trial HZNP-HZN-825-301 that, in the opinion of the Investigator, would potentially put the subject at unacceptable risk.
- Pregnant or lactating women.
- Participants will be ineligible if, in the opinion of the Investigator, they are unlikely to comply with the trial protocol or have a concomitant disease or condition that could interfere with the conduct of the trial.
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These studies are not open to everyone who meets the eligibility criteria, but only to people in that particular population, who are specifically invited to participate.