Analytics firm GlobalData published Wednesday September 2, 2026 a myasthenia gravis (MG) market forecast projecting the seven-major-markets (7MM: United States, France, Germany, Italy, Spain, United Kingdom, Japan) MG treatment market to grow from $4.5 billion in 2024 to $13.0 billion in 2034 at an 11.1% CAGR, driven by launches and label expansions in the anti-FcRn class (argenx Vyvgart Hytrulo, Johnson & Johnson Imaavy nipocalimab), complement inhibitors (Alexion/AstraZeneca Ultomiris, Soliris), and BAFF/BLyS-targeting therapies (Cytokinetics aficamten in adjacent indications). The forecast supports the ongoing peptide-therapeutic case in autoimmune indications where synthetic peptide-vaccine and peptide-immunomodulator approaches (thymalfasin, thymosin analogs) are being evaluated as adjuncts to the biologics-first standard-of-care. Anti-FcRn represents the fastest-growing MG segment given the manageable safety profile and infrequent dosing versus the plasmapheresis and IVIG protocols that dominated the pre-Vyvgart era.
Johnson & Johnson (NYSE: JNJ) received FDA approval Wednesday August 26, 2026 for Imaavy (nipocalimab), an anti-neonatal Fc receptor (FcRn) monoclonal antibody administered as subcutaneous injection, for the treatment of warm autoimmune hemolytic anemia (wAIHA) in adults and pediatric patients aged 12 and older. Disease context: wAIHA is a rare autoimmune disease in which autoantibodies (primarily IgG) bind red blood cells at body temperature and trigger complement- and macrophage-mediated red blood cell destruction, causing fatigue, jaundice, splenomegaly, and in severe cases life-threatening anemia. Prior treatment has relied on corticosteroids, rituximab (an anti-CD20 monoclonal antibody), splenectomy, and other immunosuppressants, all with substantial side effects and variable efficacy. Nipocalimab mechanism: blocks the neonatal Fc receptor (FcRn) that normally rescues IgG antibodies from degradation; blocking FcRn accelerates IgG catabolism and reduces the pathogenic IgG autoantibody burden that drives wAIHA. The Imaavy approval extends the anti-FcRn therapeutic category that argenx pioneered with Vyvgart (efgartigimod alfa, IV and SC formulations) into a new autoimmune indication beyond the currently-approved indications of generalized myasthenia gravis and chronic inflammatory demyelinating polyneuropathy. The FcRn category is a growing modality with multiple companies pursuing autoimmune indications; J&J's Imaavy is now approved for wAIHA and separately in myasthenia gravis, positioning as a direct competitor to argenx's Vyvgart franchise. Approval was supported by Phase 3 clinical data documenting substantial improvements in hemoglobin levels and transfusion-independence rates compared to placebo.