NCT04833894 · argenx
Evaluating the Pharmacokinetics, Pharmacodynamics, and Safety of Efgartigimod Administered Intravenously in Children With Generalized Myasthenia Gravis
(ADAPT Jr)
What this study is about
The purpose of this trial is to investigate the PK, PD, safety, and activity of efgartigimod IV in children and adolescents aged from 2 to less than 18 years of age with gMG.
View original scientific description
The purpose of this trial is to investigate the PK, PD, safety, and activity of efgartigimod IV in children and adolescents aged from 2 to less than 18 years of age with gMG.
Interventions
BIOLOGICAL
Efgartigimod IV
Intravenous infusion of Efgartigimod
Primary outcome measures
Efgartigimod concentrations as input for compartmental, model-driven analysis to determine (age and size dependency of) Clearance (CL)
Time frame: up to 26 weeks
Blood samples will be collected from each participant for measurement of serum concentrations of efgartigimod
Efgartigimod concentrations as input for compartmental, model-driven analysis to determine (age and size dependency of) Volume of Distribution (Vd)
Time frame: up to 26 weeks
Blood samples will be collected from each participant for measurement of serum concentrations of efgartigimod
Total Immunoglobulin G (IgG) levels as input for pharmacokinetics (PK) and pharmacodynamics (PD) modeling analysis
Time frame: up to 26 weeks
Total Immunoglobulin G levels will be measured from blood samples
Anti-acetylcholine receptors antibodies (AChR-Ab) as input for pharmacokinetics (PK) and pharmacodynamics (PD) modeling analysis
Time frame: up to 26 weeks
Total Immunoglobulin G (IgG) levels will be measured from blood samples
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Ability of the participant and/or his/her legally authorized representative to understand the requirements of the trial and provide written informed consent/assent, if applicable (including consent/assent for the use and disclosure of research-related health information), willingness and ability to comply with the trial protocol procedures (including attending the required trial visits). 2. Male or female participants between 2 to less than 18 years of age at the time of providing informed consent/assent. Age groups are enrolled in a staggered fashion respectively: 6 participants in the 12 to less than 18 years of age group followed by 6 participants in the 2 to less than 12 years of age group at the time of providing informed consent/assent. 3. Diagnosed with Generalized Myasthenia Gravis (gMG) with confirmed documentation 4. Meeting the clinical criteria as defined by the Myasthenia Gravis Foundation of America (MGFA) class II, III, and IVa. 5. Eligible partic
Where
- Chicago, Illinois
- Chapel Hill, North Carolina
- Charlottesville, Virginia
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Feb 18, 2026 · Source of record for eligibility and locations