Thyroid Eye Disease Clinical Trial
Official title:
A Phase 3, Randomized, Double-Masked, Placebo-Controlled, Multicenter Study to Evaluate the Efficacy, Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Immunogenicity of Efgartigimod PH20 SC Administered by Prefilled Syringe in Adult Participants With Thyroid Eye Disease
This study aims to evaluate the efficacy, safety and tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and immunogenicity of efgartigimod PH20 SC in participants with active, moderate-to-severe TED, compared with placebo PH20 SC. After an up to 28-day screening period, eligible participants will be randomized in a 2:1 ratio to receive efgartigimod PH20 SC or placebo PH20 SC, respectively. Study drug will be administered subcutaneously during the 24-week double-blinded treatment period (DBTP). At the end of the DBTP (week 24), proptosis responders will enter a follow-up observational period (52 weeks) to assess the safety, tolerability, and durability of efgartigimod PH20 SC treatment while off therapy. Proptosis nonresponders and participants who have proptosis relapse during the 52-week follow-up observational period will receive open-label treatment with efgartigimod PH20 SC for up to 24 weeks.
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