Response of patients with refractory myasthenia gravis to rituximab: a retrospective study

RJ Nowak, DB DiCapua, N Zebardast… - Therapeutic …, 2011 - journals.sagepub.com
RJ Nowak, DB DiCapua, N Zebardast, JM Goldstein
Therapeutic advances in neurological disorders, 2011journals.sagepub.com
Introduction: Myasthenia gravis, an autoimmune disorder of neuromuscular transmission, is
treated by an array of immunomodulating therapies. A variable response is observed with
certain patients being medically refractory. Methods: We report the results of 14 refractory
generalized myasthenia gravis patients (6 AChR+; 8 MuSK+) treated with rituximab. Results:
Sustained clinical improvement was observed in all patients as well as a reduction of
conventional immunotherapies. Prednisone dose decreased a mean of 65.1%, 85.7%, and …
Introduction
Myasthenia gravis, an autoimmune disorder of neuromuscular transmission, is treated by an array of immunomodulating therapies. A variable response is observed with certain patients being medically refractory.
Methods
We report the results of 14 refractory generalized myasthenia gravis patients (6 AChR+; 8 MuSK+) treated with rituximab.
Results
Sustained clinical improvement was observed in all patients as well as a reduction of conventional immunotherapies. Prednisone dose decreased a mean of 65.1%, 85.7%, and 93.8% after cycle 1, 2, and 3 of rituximab therapy, respectively. A statistically significant reduction in plasma exchange sessions was seen after cycle 1 with all patients being off of plasma exchange after cycle 3. Acetylcholine receptor antibody titers decreased a mean of 52.1% (p = 0.0046) post-cycle 2.
Conclusion
Our results support the hypothesis that rituximab is beneficial and well tolerated in managing refractory myasthenia gravis and nearly doubles published cases. We propose that B-cell-directed therapies may become an attractive option and suggest pursuit of a prospective trial.
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