For Healthcare Professionals

A Study to Assess the Long-term Safety and Efficacy of a Subcutaneous Formulation of Efgartigimod PH20 SC in Adults With Pemphigus (Vulgaris or Foliaceus)


About the study

This is a prospective, multicenter, open label extension (OLE) trial on the efficacy, safety, patient outcome measures, tolerability, immunogenicity, PK and PD of efgartigimod PH20 SC in adult PV or PF participants, who participated in antecedent trial ARGX-113-1904. This trial provides extension of efgartigimod PH20 SC treatment and retreatment options for participants who have been randomized to efgartigimod PH20 SC treatment arm in the trial ARGX-113-1904, and the first treatment of efgartigimod PH20 SC and retreatment options for participants who had been randomized to placebo arm in trial ARGX-113-1904. Trial ARGX-113-1905 evaluates ability to (further) taper prednisone therapy and achieve Clinical Remission (CR) off therapy (CRoff), the ability to achieve CR and CR on minimal therapy (CRmin) for participants who had not yet achieved CRmin, and the ability to treat flare; and assess patient outcome measures and the safety, PD, PK and immunogenicity of efgartigimod PH20 SC over the duration of trial. Study duration: Up to 60 weeks for participants who receive IMP administration up to 52 weeks and with a follow-up period of 8 weeks after the last IMP administration

Who can take part

You may be eligible to participate in the study if you meet the following criteria:


Inclusion Criteria:

  1. Ability to understand the requirements of the trial, to provide written informed consent (including consent for the use and disclosure of research-related health information), willingness and ability to comply with the trial protocol procedures (including required trial visits).
  2. The participant participated in trial ARGX-113-1904 and completed the study or has the defined criteria for rollover.

Contraceptive use by men and women should be consistent with local regulations regarding the methods for contraception for those participating in clinical trials and:

Male participants:

Male participants must agree to use an acceptable method of contraception as described in the protocol, from signing the ICF until the last dose of the study drug.

Female participants

Women of childbearing potential (WOCBP) must:

  1. have a negative urine pregnancy test at baseline before the IMP can be administered,
  2. agree to use a highly effective or acceptable contraception method (as described in the protocol), which should be maintained at minimum until after the last dose of IMP


Exclusion Criteria:

  1. Pregnant and lactating women and those intending to become pregnant during the trial.
  2. Participants with clinical evidence of other significant serious disease or participants who recently underwent or have planned a major surgery during the period of the trial, or any other condition in the opinion of the investigator, that could confound the results of the trial or put the participant at undue risk.
  3. Known hypersensitivity to any of the components of the administered treatments.
pin location

Study Locations

Enter your ZIP code/Postal code/PIN code to locate study sites near you:

How to Apply

Contact the study center to learn if this study is a good match for you.

Study’s details


Pemphigus Vulgaris,Pemphigus Foliaceus

Age (in years)



Phase 3

Participants needed


Est. Completion Date

Nov 19, 2024

Treatment type



argenx identifier


Study number


Understanding Clinical Trials

Get answers to your questions about clinical trials.What is a clinical research?What does taking part in clinical trials involve?What should I ask the trial doctor?


Sign up to save your favorites, 
receive newsletters, resources, and alerts 
about clinical trials related to your conditions of interest.