Gefurulimab successfully completes Phase III trials in myasthenia gravis with anti-RACh+ antibodies

The Phase III PREVAIL trial evaluated gefurulimab (or ALXN1720) against a placebo in 20 countries, including France, in 249 adults with a generalised form of autoimmune myasthenia gravis:

  • this drug candidate is a bispecific nano-antibody that binds to the C5 component of the complement system (to block its activation) and to albumin, which is thought to prolong its half-life;
  • it is self-administered subcutaneously on a weekly basis, with the option of receiving immunoglobulins concurrently,
  • the efficacy endpoints of the PREVAIL trial were met, with a significant, rapid (from week 1) and sustained (for 26 weeks) improvement in MG-ADL and QMG scores,
  • the incidence of adverse events was equivalent in both groups (75.6 per cent on gefurulimab and 80.6 per cent on placebo), most of which were mild to moderate in severity, with no reported cases of meningococcal infection.