Major trial to determine best drug for rare autoimmune disease

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Diagnosis of NMOSD according to the 2015 International Panel for NMO Diagnosis (IPND) consensus criteria. * Seropositivity for AQP4 immunoglobulin G (AQP4-IgG) confirmed by a cell-based assay (either live or fixed) that meets the threshold for positivity set by the local testing laboratory. * Age ≥18 years at the time of consent. * Ability and willingness to provide informed consent and comply with all study procedures, including scheduled visits, laboratory tests, and assessments. * Eligible to receive any of the study drugs based on clinical judgment Exclusion Criteria: * Known active hepatitis B virus (HBV) infection, defined as a positive hepatitis B surface antigen or detectable HBV DNA by PCR. * Known active hepatitis C virus (HCV) infection, defined as detectable HCV RNA by PCR. * Known active or latent tuberculosis, evidenced by a positive interferon-gamma release assay (IGRA) unless fully treated per local guidelines before enrollment. * Known or suspected immunodeficiency disorders, including but not limited to HIV infection with CD4 count \<200 cells/mm³ or any condition requiring chronic immunosuppressive therapy outside the scope of the study drugs. * Pregnancy or breastfeeding, or intention to conceive during the study period. Pregnancy is excluded due to insufficient safety data for the investigational treatments in this population. Women of childbearing potential must agree to use effective contraception throughout the study and for a defined period following the last dose of study drug, per product labeling or institutional guidance. * Any medical, psychiatric, or neurological condition that, in the investigator's opinion, may interfere with study participation, pose additional risk to the participant, or confound interpretation of study results. * Inability or unwillingness to comply with the requirements of the protocol, including scheduled visits, evaluations, or procedures, based on investigator assessment. * Known hypersensitivity or severe allergic reaction to any component of the study drugs or pre-medications required for infusion.