ArticleNeurology and therapy2026
AQP4-IgG Dynamics and Exploratory Assessment of SERA-3 in Neuromyelitis Optica Spectrum Disorder Treated with Satralizumab.
Article in Neurology and therapy, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
introductionNeuromyelitis optica spectrum disorder (NMOSD) is an autoimmune condition driven by aquaporin-4 immunoglobulin G (AQP4-IgG). The current treatment paradigm focuses on mitigating clinical relapses and disability accumulation, leaving the underlying serological activity unaddressed. This study evaluated the capacity of satralizumab to achieve a comprehensive remission, as defined by the Serological, Relapse, and Accumulated-disability Remission (SERA-3) target.
methodsIn this multicenter, real-world cohort study, patients with NMOSD from three tertiary centers in China initiating satralizumab were enrolled. AQP4-IgG levels were measured at baseline, 6, and 12 months. Clinical efficacy [annualized relapse rate (ARR), Expanded Disability Status Scale (EDSS)] and safety were evaluated. Heterogeneity in antibody response was analyzed, and baseline characteristics potentially associated with titer reduction were explored.
resultsOf the 19 patients who were AQP4-IgG seropositive at baseline, 7 (36.84%) met the strict definition of SERA-3 Complete. Of these, 4 patients achieved seroconversion at month 6 and remained seronegative through month 12, whereas 3 first achieved seroconversion at month 12. An additional 5 (26.32%) showed a reduction in AQP4-IgG titers. Satralizumab treatment was associated with marked clinical benefit. Among 33 patients included in the clinical efficacy analysis, 27 (81.82%) remained relapse-free during follow-up, median ARR decreased from 0.92 (IQR 0.56-1.59) to 0 (IQR 0-0), and EDSS scores remained stable in most patients. Exploratory analyses suggested that patients achieving serological response were older at disease onset (57.42 ± 17.82 versus 42 ± 14.24 years, p = 0.039) and had experienced fewer pre-treatment relapses (median 2 versus 5, p = 0.049). Satralizumab was generally well tolerated, including in older patients.
conclusionsOur findings support SERA-3 as a potential treatment framework for NMOSD. Satralizumab was associated with attainment of serological, relapse, and disability remission in a substantial proportion of patients, supporting further prospective evaluation of SERA-3 as a hypothesis-generating outcome framework.
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