Sustained response to Rituximab in anti-AChR and anti-MuSK positive Myasthenia Gravis patients

J Neuroimmunol. 2008 Sep 15;201-202:90-4. doi: 10.1016/j.jneuroim.2008.04.039. Epub 2008 Jul 23.

Abstract

We report the results of treatment with Rituximab in six severe, non-responder MG patients. We treated three AChR+MG and three MuSK+MG patients, representing 2% and 20% of the respective groups of our series. Patients were assessed according to the Myasthenia Gravis Foundation of America (MGFA) recommendations. Antibody titers to AChR and MuSK, Ig levels, and IgG subclasses, were tested before treatment and during a follow-up of 9-22 months. All patients, one class V and five class IVB, improved dramatically, with no side effects. Antibody titers declined in all patients (p=0.006). The decline was significantly better in MuSK+MG patients at 9 months (p=0.046) and correlated with a more sustained clinical improvement. We did not find any significant changes in IgG4 that could explain the different outcome observed between these two groups.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Antibodies, Monoclonal / therapeutic use*
  • Antibodies, Monoclonal, Murine-Derived
  • Female
  • Follow-Up Studies
  • Humans
  • Immunoglobulin G / blood*
  • Immunologic Factors / therapeutic use*
  • Male
  • Middle Aged
  • Myasthenia Gravis / blood
  • Myasthenia Gravis / classification
  • Myasthenia Gravis / drug therapy*
  • Myasthenia Gravis / immunology
  • Receptor Protein-Tyrosine Kinases / immunology*
  • Receptors, Cholinergic / immunology*
  • Rituximab
  • Statistics, Nonparametric

Substances

  • Antibodies, Monoclonal
  • Antibodies, Monoclonal, Murine-Derived
  • Immunoglobulin G
  • Immunologic Factors
  • Receptors, Cholinergic
  • Rituximab
  • MUSK protein, human
  • Receptor Protein-Tyrosine Kinases