The study objective is to see if IV Efgartigimod and Vyjuvek treatment in Recessive Dystrophic Epidermolysis Bullosa (RDEB) and IV Efgartigimod treatment in Epidermolysis Bullosa Acquisita (EBA) improves wound healing and affects the levels of C7 antibody levels in serum.
Fewer wounds, more rapidly healing wounds, and decreased C7 antibodies could improve quality of life.
For DEB patients (aged 12 years or older): DEB confirmed with mutation analysis and correlated by phenotype, and treatment of at least 1 wound treated with topical gene therapy (VYJUVEK). Presence of C7 antibodies above normal cutoff on ELISA.
For (classic) EBA patients (aged 18 years or older): EBA confirmed with positive histopathology (DIF), C7 antibodies above normal cutoff on ELISA, and having at least 1 skin lesion.
The participant has a Karnofsky performance status of at least 60% at screening.
Women of childbearing potential must have a negative serum pregnancy test at screening and a negative urine pregnancy test at week 1 / baseline before study intervention can be administered. Subsequent urine pregnancy tests are to be completed at week 6, week 11, week 16, week 21, and week 26 / EoS.
Linear IgA dermatosis-like EBA or other autoimmune blistering diseases (including but not limited to pemphigus vulgaris, bullous pemphigoid, mucous membrane pemphigoid).
sulfasalazine, IVIg, subcutaneous administration of immunoglobulin (SCIg), immunoadsorption or plasma exchange within 2 weeks of the screening visit, tetracyclines with or without nicotinamide at doses higher than the recommended daily allowance (RDA)/dietary reference intake (DRI) within 2 weeks of the screening visit.
any monoclonal antibody (including rituximab or another anti-CD20 biologic) within 6 months of the screening visit.
complementary therapies-such as traditional Chinese medicines, herbs, or procedures (e.g., acupuncture)-within 4 weeks (or 5 half-lives) of the screening visit, if the investigator determines that such therapies may interfere with the study's efficacy assessments and/or potentially risk the safety of the participant.
Single group
Efgartigimod
Biological/VaccineDosage: 10mg/kg Frequency: Once a week Duration: 25 weeks
Reduction in serum C7 antibody levels
The proportion of patients who exhibit reduction in serum C7 antibody levels at week 26 as compared to week 1.
Adverse Events and Effects
Occurrence of adverse events and effects.
The Epidermolysis Bullosa Disease Activity and Scarring Index (EBDASI) improvement
The overall improvement of EB symptoms at week 26 as compared to week 1, measured by percentage change of a participant's EBDASI score (overall total score, total activity score, and total damage score). The EBDASI is scored in the range of 0 - 506, with a lower score corresponding to mild disease and higher score corresponding to more severe disease.
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