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Third-line tocilizumab for refractory pediatric anti-NMDA receptor encephalitis: a single-center case series
Rocio Victoria Garcia1, Andrea Del Rocio Quiroz Saavedra2, Maria Celeste Buompadre1
1Department of Neurology, Hospital de Pediatría Prof. Dr. Juan P. Garrahan, Buenos Aires, Argentina.
Abstract:
Tocilizumab has been proposed as a third-line therapy for refractory autoimmune encephalitis; pediatric Latin American data remain limited.
Objective:
To evaluate the efficacy and safety of tocilizumab in pediatric patients with severe or refractory anti-N-methyl-d-aspartate receptor (NMDAR) encephalitis.
Materials And Methods:
We retrospectively reviewed pediatric patients with definite anti-NMDAR encephalitis treated with tocilizumab after inadequate response to previous therapy.
Results:
Six patients (four males, median age at onset 4.5 years). All had severe disease (modified Rankin Scale [mRS] 4-5; Clinical Assessment Scale in Autoimmune Encephalitis [CASE] ≥10). All received first-line therapy, five received rituximab before tocilizumab. Tocilizumab was initiated 2-3 months after the last rituximab infusion. At 12 months, all achieved favorable outcomes (mRS 2; CASE ≤4). Adverse events included varicella-zoster virus infection, mild cytopenia, and dyslipidemia.
Conclusions:
Tocilizumab was associated with favorable outcomes and acceptable safety in this small pediatric series of refractory anti-NMDAR encephalitis. The CASE scale was a sensitive and reliable instrument for longitudinal functional assessment.