Efficacy and Safety of Divozilimab in Patients With Neuromyelitis Optica Spectrum Disorders (AQUARELLE)

Inclusion Criteria: * NMOSD diagnosed based on the 2015 NMOSD International Consensus Diagnostic Criteria * Documented evidence of at least 1 relapse within 12 months before signing the informed consent form, or 2 relapses within 24 months before signing the informed consent form * A total EDSS score of ≤ 7 * Presence of IgG antibodies to the Varicella Zoster virus at screening * A CD19+ cell proportion of ≥ 1 % of the total lymphocyte count in patients exposed to other anti-B-cell therapies more than 6 months before signing the informed consent form Exclusion Criteria: * A relapse occurring less than 30 days before signing the informed consent form or at screening (patients may be re-screened) * Intrathecal oligoclonal or monoclonal IgG production (in patients who are anti-AQP4 seronegative) * Other nervous system disorders (including multiple sclerosis) that can mask or affect the assessment of NMOSD symptoms * History of other autoimmune diseases requiring immunosuppressive therapy * Prior exposure to: alemtuzumab, total lymphatic irradiation, bone marrow transplantation; anti-B-cell therapy drugs, abatacept, satralizumab within 6 months prior to signing the informed consent form; mitoxantrone, cyclophosphamide, methotrexate, cyclosporine A, tacrolimus, eculizumab, tocilizumab, natalizumab, interferon beta, glatiramer acetate, fingolimod, teriflunomide, dimethyl fumarate within 3 months before signing the informed consent form; immunoglobulin products within 30 days before signing the informed consent form; transfusion of blood or blood components within 30 days before signing the informed consent form; systemic corticosteroids at the time of signing the informed consent form