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RESEARCH PAPER ANALYSIS

Rituximab Use for Relapse Prevention in Anti-NMDAR Antibody-Mediated Encephalitis: A Multicenter Cohort Study.

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PMID40446185
JournalNeurology(R) neuroimmunology & neuroinflammation
Publication Date2025-05-30
Ingested2026-08-02 12:04 AM
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ABSTRACT

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BACKGROUND AND OBJECTIVES: Rituximab is an anti-CD20 monoclonal antibody used in patients with anti-NMDAR antibody (Ab)-mediated encephalitis as both an acute escalation therapy and a longer term relapse risk-reduction treatment. The potential long-term benefit of a single course administered during the acute disease phase on future relapse risk is uncertain. Moreover, the optimal dosing duration to reduce relapse risk is unknown. The aim of this study was to evaluate the effect of a single course of rituximab on relapse incidence. We also studied the duration of effect of a course of rituximab in adult patients with anti-NMDAR Ab-mediated encephalitis. METHODS: We recruited 67 patients with anti-NMDAR Ab-mediated encephalitis from 10 Australian hospitals. Rituximab exposure was quantified as a time-varying covariate in Cox proportional hazard models. RESULTS: A single course of rituximab was associated with longer time to first relapse (hazard ratio [HR] 0.11, 95% CI 0.02-0.70, p = 0.02). For patients in whom redosing is considered, rituximab was associated with longer time to first relapse at 6 months after the last infusion, after adjusting for concurrent immunotherapies and the presence of ovarian teratoma at disease onset (HR 0.05, 95% CI 0.00-0.48, p = 0.005). The treatment effect did not persist out to 12 months after a given course (HR 0.60, 95% CI 0.15-2.44, p = 0.47). DISCUSSION: A single course of rituximab reduces the risk of relapse of anti-NMDAR antibody-mediated encephalitis. In select patients for whom redosing of rituximab is considered, administration at 6 months delays relapses. CLASSIFICATION OF EVIDENCE: This study provides Class IV evidence that rituximab delays relapses in patients with anti-NMDAR antibody-mediated encephalitis.

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Rituximab Use for Relapse Prevention in Anti-NMDAR Antibody-Mediated Encephalitis: A Multicenter Cohort Study.

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