Therefore, the investigators of this study are investigating whether SHR1459 could prevent relapse of NMOSDs.~The primary objective of this study is to evaluate the effectiveness of SHR1459 in NMOSDs patients.~The secondary objectives are to determine:~The safety profile of SHR 1459 in patients with NMOSDs. Whether SHR1459 reduce MRI lesions and APQ4-Abs level.
This is an open-label study, to evaluate the efficacy and safety of SHR1459 in participants with NMOSDs.