Remegen Co. Ltd. emerged as a surprise challenger in the generalized myasthenia gravis space, unveiling positive phase III data of its China-approved lupus drug, telitacicept (RCT-18; Tai’ai), in the rare autoimmune neuromuscular disorder at the 2025 American Academy of Neurology conference.
Remegen Co. Ltd. emerged as a surprise challenger in the generalized myasthenia gravis space, unveiling positive phase III data of its China-approved lupus drug, telitacicept (RCT-18; Tai’ai), in the rare autoimmune neuromuscular disorder at the 2025 American Academy of Neurology conference.
Argenx SE’s ARGX-119 is a monoclonal antibody (MAb) targeting the muscle-specific kinase (MuSK) Frizzled (Fz)-like domain, and has entered early clinical development for the treatment of neuromuscular diseases.
The U.S. FDA approval won in June by Argenx SE of subcutaneously given Vyvgart Hytrulo (efgartigimod alfa and hyaluronidase) for adults with chronic inflammatory demyelinating polyneuropathy (CIDP) sparked interest in other prospects taking aim at the rare disease. Some – including Argenx – are going after generalized myasthenia gravis and multifocal motor neuropathy with their compounds.
Argenx SE gained U.S. FDA approval of subcutaneously given Vyvgart Hytrulo (efgartigimod alfa and hyaluronidase-qvfc) for adult patients with chronic inflammatory demyelinating polyneuropathy (CIDP). The company’s stock (NASDAQ:ARGX) was up 11.7% to $440.59 at the close of trading June 24. About 24,000 people in the U.S. are being treated for CIDP, and patients are generally diagnosed between 40 and 60 years of age.
In August 2020, Johnson & Johnson paid $6.5 billion cash to acquire Momenta Pharmaceuticals Inc. That strengthened J&J’s immune-mediated disease portfolio and grew its interest in autoantibody-driven disease therapies by bringing nipocalimab into the fold. Now the investment is paying off with top-line results of phase II and III studies that hit their primary endpoints using the fully human glycosylated monoclonal antibody targeting the human neonatal Fc receptor. The studies were in treating generalized myasthenia gravis and in Sjögren’s disease.
Argenx SE CEO Tim Van Hauwermeiren said that, with subcutaneous efgartigimod (efgartigimod alfa and hyaluronidase-qvfc) in pemphigus, the company is “facing a situation where, even with a strong scientific hypothesis and well-executed trial, we encountered the unknown-unknown,” and the phase III experiment failed. “We are committed to doubling down” on the execution of the firm’s business plan, he added.
Argenx SE’s surprise phase III blowup with subcutaneous Vyvgart Hytrulo (efgartigimod alfa and hyaluronidase-qvfc) in the platelet disorder primary immune thrombocytopenia (ITP) – blamed on a higher-than-expected placebo response – had investors speculating about possible read-throughs to other indications.
The picture keeps getting brighter for Argenx SE which, having targeted $750 million in a financing after positive phase II data, priced a global public offering of $1.1 billion, one of history’s larger rounds. Amsterdam-based Argenx capitalized on positive top-line data from the phase II Adhere study with Vyvgart Hytrulo (efgartigimod alfa plus hyaluronidase-qvfc) in chronic inflammatory demyelinating polyneuropathy.
