Rituximab as treatment for anti-MuSK myasthenia gravis
Multicenter blinded prospective review
Abstract
Objective:
To evaluate the efficacy of rituximab in treatment of anti-muscle-specific kinase (MuSK) myasthenia gravis (MG).
Methods:
This was a multicenter, blinded, prospective review, comparing anti-MuSK-positive patients with MG treated with rituximab to those not treated with rituximab. The primary clinical endpoint was the Myasthenia Gravis Status and Treatment Intensity (MGSTI), a novel outcome that combines the Myasthenia Gravis Foundation of America (MGFA) postintervention status (PIS) and the number and dosages of other immunosuppressant therapies used. A priori, an MGSTI of level ≤2 was used to define a favorable outcome. Secondary outcomes included modified MGFA PIS of minimal manifestations or better, mean/median prednisone dose, and mean/median doses of other immunosuppressant drugs.
Results:
Seventy-seven of 119 patients with anti-MuSK MG evaluated between January 1, 2005, and January 1, 2015, at 10 neuromuscular centers were selected for analysis after review of limited clinical data by a blinded expert panel. An additional 22 patients were excluded due to insufficient follow-up. Baseline characteristics were similar between the rituximab-treated patients (n = 24) and the controls (n = 31). Median follow-up duration was >3.5 years. At last visit, 58% (14/24) of rituximab-treated patients reached the primary outcome compared to 16% (5/31) of controls (p = 0.002). Number needed to treat for the primary outcome is 2.4. At last visit, 29% of rituximab-treated patients were taking prednisone (mean dose 4.5 mg/day) compared to 74% of controls (mean dose 13 mg/day) (p = 0.001 and p = 0.005).
Classification of evidence:
This study provides Class IV evidence that for patients with anti-MuSK MG, rituximab increased the probability of a favorable outcome.
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REFERENCES
1.
Zhou L, McConville J, Chaudhry V, et al. Clinical comparison of muscle-specific tyrosine kinase (MuSK) antibody-positive and -negative myasthenic patients. Muscle Nerve 2004;30:55–60.
2.
Guptill JT, Sanders DB, Evoli A. Anti-MuSK antibody myasthenia gravis: clinical findings and response to treatment in two large cohorts. Muscle Nerve 2011;44:36–40.
3.
Pasnoor M, Wolfe GI, Nations S, et al. Clinical findings in MuSK-antibody positive myasthenia gravis: a U.S. experience. Muscle Nerve 2010;41:370–374.
4.
Evoli A, Alboini PE, Bisonni A, Mastrorosa A, Bartoccioni E. Management challenges in muscle-specific tyrosine kinase myasthenia gravis. Ann NY Acad Sci 2012;1274:86–91.
5.
Greenberg SB. Infections in the immunocompromised rheumatologic patient. Crit Care Clin 2002;18:931–956.
6.
Baek WS, Bashey A, Sheean GL. Complete remission induced by rituximab in refractory, seronegative, muscle-specific, kinase-positive myasthenia gravis. J Neurol Neurosurg Psychiatry 2007;78:771.
7.
Blum S, Gillis D, Brown H, et al. Use and monitoring of low dose rituximab in myasthenia gravis. J Neurol Neurosurg Psychiatry 2011;82:659–663.
8.
Burusnukul P, Brennan TD, Cupler EJ. Prolonged improvement after rituximab: two cases of resistant muscle-specific receptor tyrosine kinase + myasthenia gravis. J Clin Neuromuscul Dis 2010;12:85–87.
9.
Collongues N, Casez O, Lacour A, et al. Rituximab in refractory and non-refractory myasthenia: a retrospective multicenter study. Muscle Nerve 2012;46:687–691.
10.
Diaz-Manera J, Martinez-Hernandez E, Querol L, et al. Long-lasting treatment effect of rituximab in MuSK myasthenia. Neurology 2012;78:189–193.
11.
Hain B, Jordan K, Deschauer M, Zierz S. Successful treatment of MuSK antibody-positive myasthenia gravis with rituximab. Muscle Nerve 2006;33:575–580.
12.
Lebrun C, Bourg V, Tieulie N, Thomas P. Successful treatment of refractory generalized myasthenia gravis with rituximab. Eur J Neurol 2009;16:246–250.
13.
Maddison P, McConville J, Farrugia ME, et al. The use of rituximab in myasthenia gravis and Lambert-Eaton myasthenic syndrome. J Neurol Neurosurg Psychiatry 2011;82:671–673.
14.
Nowak RJ, Dicapua DB, Zebardast N, Goldstein JM. Response of patients with refractory myasthenia gravis to rituximab: a retrospective study. Ther Adv Neurol Disord 2011;4:259–266.
15.
Stieglbauer K, Topakian R, Schaffer V, Aichner FT. Rituximab for myasthenia gravis: three case reports and review of the literature. J Neurol Sci 2009;280:120–122.
16.
Thakre M, Inshasi J, Marashi M. Rituximab in refractory MuSK antibody myasthenia gravis. J Neurol 2007;254:968–969.
17.
Zebardast N, Patwa HS, Novella SP, Goldstein JM. Rituximab in the management of refractory myasthenia gravis. Muscle Nerve 2010;41:375–378.
18.
Tandan R, Hehir MK II, Waheed W, Howard DB. Rituximab treatment of myasthenia gravis: a systematic review. Muscle Nerve 2017;56:185–196.
19.
Benatar M, Sanders DB, Burns TM, et al. Recommendations for myasthenia gravis clinical trials. Muscle Nerve 2012;45:909–917.
20.
Johnston SC, Wilson CB, Halbach VV, et al. Endovascular and surgical treatment of unruptured cerebral aneurysms: comparison of risks. Ann Neurol 2000;48:11–19.
21.
Johnston SC. Identifying confounding by indication through blinded prospective review. Am J Epidemiol 2001;154:276–284.
22.
Jaretzki A III, Barohn RJ, Ernstoff RM, et al. Myasthenia gravis: recommendations for clinical research standards: Task Force of the Medical Scientific Advisory Board of the Myasthenia Gravis Foundation of America. Neurology 2000;55:16–23.
23.
Sanders DB, Wolfe GI, Benatar M, et al. International consensus guidance for management of myasthenia gravis: executive summary. Neurology 2016;87:419–425.
24.
Silvestri NJ, Wolfe GI. Treatment-refractory myasthenia gravis. J Clin Neuromuscul Dis 2014;15:167–178.
25.
Suh J, Goldstein JM, Nowak RJ. Clinical characteristics of refractory myasthenia gravis patients. Yale J Biol Med 2013;86:255–260.
Information & Authors
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© 2017 American Academy of Neurology.
Publication History
Received: March 7, 2017
Accepted: May 22, 2017
Published online: August 11, 2017
Published in print: September 5, 2017
Authors
Author Contributions
Dr. Hehir: study design, expert panel, data collection, data analysis, statistical analysis, and manuscript composition. Dr. Hobson-Webb: study design, expert panel, data collection, data analysis, and critical revision of manuscript. Dr. Benatar: study design, data collection, data analysis, and critical revision of manuscript. Dr. Barnett: study design, expert panel, data collection, data analysis, and critical revision of manuscript. Dr. Silvestri: expert panel, data analysis, and critical revision of manuscript. Dr. Howard Jr.: expert panel, data analysis, and critical revision of manuscript. D. Howard: statistical analysis and critical revision of manuscript. Dr. Visser: data collection, data analysis, and critical revision of manuscript. Dr. Crum: data collection, data analysis, and critical revision of manuscript. Dr. Nowak: data collection, data analysis, and critical revision of manuscript. Dr. Beekman: data collection, data analysis, and critical revision of manuscript. Dr. Kumar: data collection, data analysis, and critical revision of manuscript. Dr. Ruzhansky: data collection, data analysis, and critical revision of manuscript. Dr. Chen: data collection, data analysis, and critical revision of manuscript. Dr. Pulley: data collection, data analysis, and critical revision of manuscript. Dr. Laboy: data collection, data analysis, and critical revision of manuscript. Dr. Fellman: data collection, data analysis, and critical revision of manuscript. Dr. Greene: data collection, data analysis, and critical revision of manuscript. Dr. Pasnoor: data collection, data analysis, and critical revision of manuscript. Dr. Burns: study design, expert panel, data collection, data analysis, and manuscript composition.
Disclosure
M. Hehir is supported by an American Academy of Neurology, American Brain Foundation, and Myasthenia Gravis Foundation of America Clinician Scientist Development Award. Dr. Hehir also received support from the UVM Department of Neurosciences for this project. L. Hobson-Webb, M. Benatar, and C. Barnett report no disclosures relevant to the manuscript. N. Silvestri has consulted for Alexion and OptionCare for unrelated myasthenia gravis projects. J. Howard Jr., D. Howard, A. Visser, and B. Crum report no disclosures relevant to the manuscript. R. Nowak is supported, in part, by National Institute of Neurologic Disorders and Stroke (NINDS) of the NIH under award number U01NS084495. Dr. Nowak also reports support through an investigator-initiated trial agreement from Genentech for placebo/drug for the currently underway clinical trial (clincialtrials.gov, NCT02110706). This funding/support is separate from the research in this article but related. R. Beekman, A. Kumar, K. Ruzhansky, I. Chen, M. Pulley, S. Laboy, M. Fellman, S. Greene, M. Pasnoor, and T. Burns report no disclosures relevant to the manuscript. Go to Neurology.org for full disclosures.
Study Funding
No targeted funding reported.
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