Belgium-based argenx SE has won US Food and Drug Administration approval for its first product, Vyvgart (efgartigimod), for the treatment of generalised myasthenia gravis, a neuromuscular disease that causes weakness in the skeletal muscles. Vyvgart is an antibody fragment that binds to the neonatal Fc receptor, preventing the receptor from recycling immunoglobulin G (IgG) back into blood. This leads to a reduction in IgG levels, including reductions in abnormal anti-acetylcholine receptor (AChR) antibodies which are present in myasthenia gravis.
