A Clinical Research Study of Inebilizumab in Neuromyelitis Optica Spectrum Disorders

Treatment tested

• Inebilizumab

  B-lymphocyte antigen CD19 binding agent

Other measures (4)

Inclusion Criteria: * Patients who have comprehensive understanding of the study content, process and possible adverse reactions, and sign the informed consent forms voluntarily * Men and women 18 years or older * Patients with NMOSD diagnosed according to the definition in the Guidelines for the Diagnosis and Treatment of Neuromyelitis Optica Spectrum Disorders in China * Patients with positive serum anti-AQP4-IgG results at screening * A documented history of one or more NMOSD acute relapses that required rescue therapy within the last year, or 2 or more NMOSD acute relapses that required rescue therapy within 2 years prior to screening * Patients with EDSS score of ≤ 7.5 points * Patients who and whose sexual partner agree to take highly effective method of contraception from screening Exclusion Criteria: * Patients who have received any of the following treatments at any time prior to randomization: 1. Monoclonal antibodies against CD52: such as alemtuzumab, etc. 2. Total lymphoid irradiation 3. Bone marrow transplant 4. T-cell vaccination therapy * Receipt of rituximab or other B-cell depleting agents (e.g., Belimumab, Telitacicept) within 6 months prior to screening, unless the patient has B-cell counts above the LLN according to the central laboratory; * Receipt of rituximab or other B-cell depleting agents (e.g., Belimumab, Telitacicept) within 6 months prior to screening, unless the patient has B-cell counts above the LLN according to the central laboratory; * Patients who have received intravenous injection of immunoglobulin (IVIG) within 1 month prior to randomization; * Patients who have received immunosuppressant therapy (e.g., cyclophosphamide, methotrexate, mitoxantrone, ciclosporin A, etc.) and biologics (satralizumab, natalizumab, tocilizumab, eculizumab, etc.) within 3 months or 5 half-lives of such drugs (whichever is longer) before randomization; * Any concomitant disease other than NMOSD that required treatment with oral or IV steroids at doses > 20 mg/day for > 21 days within the 6 months prior to screening; * Concurrent/previous enrollment in another clinical study involving an investigational treatment within 4 weeks or 5 published half-lives of the investigational treatment, whichever is the longer, prior to enrollment; * Severe drug allergic history or anaphylaxis to two or more food products or medicine (including known sensitivity to acetaminophen/paracetamol, diphenhydramine or equivalent antihistamine, and methylprednisolone or equivalent glucocorticoid); Known history of allergy or reaction to any component of the investigational product formulation or history of anaphylaxis following any biologic therapy; * Patients with evidence of alcohol, drug, or chemical abuse, or with history of such abuse within 1 year prior to randomization; * Female patients who are lactating or pregnant, or plan to become pregnant at any time from signing the informed consent through the study plus 6 months following last dose of investigational product; * Patients with clinically significant serious active or chronic viral infection, or bacterial infection within 60 days prior to randomization, which requires treatment with anti-infective agents or hospitalization, or might pose an additional risk to the patient in the opinion of the investigator; * Patients with known history or underlying disease of primary immunodeficiency (congenital or acquired), such as human immunodeficiency virus (HIV) infection or splenectomy, which predisposes the patient to infection; * Confirmed positive serology results of hepatitis B/C at screening * Patients with history of malignancy, except squamous or basal cell carcinoma of skin that has been successfully treated with documented success of curative therapy > 3 months prior to randomization; * Any other conditions that, in the opinion of the investigator, are not suitable for participating in the clinical study.

To assess the efficacy and safety of Inebilizumab in Chinese adult patients with neuromyelitis optica spectrum disorders.