A Study to Assess Efficacy and Safety of Efgartigimod PH20 SC PFS in Adult Participants With Graves' Disease
Trial statusNot yet recruiting
Trial phasePhase 3
Trial typeInterventional
Biological sexAll
Age18+
Sponsorargenx
About this trial
The main purpose of this study is to look at how efgartigimod affects thyroid function in adults with Graves' Disease (GD). The study will also check whether efgartigimod is safe and well tolerated. It will look at how efgartigimod is distributed and eliminated in the body, how it changes antibody levels, and how the immune system responds to it.
The study consists of a part A double-blinded treatment period, a part B treatment/observation period and a part C open-label treatment/observation period. During the part A and part B treatment periods, participants will receive efgartigimod PH20 SC via Prefilled Syringe (PFS) or placebo. During the part C open-label treatment period, participants will receive efgartigimod PH20 SC PFS. Participation in the different parts of the study will depend on the participant's response to treatment.
The total study duration for participants ranges from 63 to 135 weeks, depending on the response to treatment.
Eligibility criteria
Qualifiers
Is at least 18 years of age and the local legal age of consent for clinical studies when signing the ICF.
Has a documented diagnosis of GD with TRAb (anti-thyrotropin receptor antibody) levels >=ULN (upper limit of normal) at screening.
Has active hyperthyroidism due to GD with TSH (thyroid-stimulating hormone) <0.1 mIU/L at screening.
Has been treated with MMI (methimazole) or CBZ (carbimazole) for at least 3 months before screening.
Disqualifiers
History of hyperthyroidism not caused by GD (eg, toxic adenoma or toxic multinodular goiter).
History of RAI (radioactive iodine) therapy or received a total thyroidectomy.
T3- or T4-containing medication or supplement (eg, levothyroxine, liothyronine, desiccated thyroid preparations, or thyroid-support supplements) received <6 weeks before screening.
Any complication of hyperthyroidism or underlying medical condition that would put the participant at undue risk. This includes arrhythmia or tachyarrhythmia related to GD, such as atrial fibrillation or atrial flutter not sufficiently controlled with medications.
Trial design
Treatments tested in this trial
- Efgartigimod PH20 SC
- Placebo PH20 SC
Treatment groups
230 Participants
are divided into 5 treatment groupsLocations
Sponsors and collaborators
Source ClinicalTrials.gov