Approximately 258 eligible subjects (129 per arm) will be randomized in a 1:1 ratio to Jaktinib 100mg BID (twice daily) or matching placebo BID for a total of 16 weeks of blinded treatment. During the 16-week treatment period subjects will visit the clinic every two weeks until the Week 4 visit and then every 4 weeks until the completion of Week 16.
This is a Phase 3, multicenter, randomized, double-blind, placebo-controlled, efficacy and safety study of Jaktinib in subjects with active Ankylosing Spondylitis(AS).