RecruitingPhase 2Drug trialPhase IIb Clinical Study to Assess the Efficacy and Safety of GenSci120 Injection in Patients With Moderately to Severely Active RA Who Have an Inadequate Response to at Least One DMARDThis is a multicenter, randomized, double-blind, parallel, placebo- and active comparator- controlled clinical study conducted in patients with moderately to severely active RA and an inadequate response to at least one DMARD, designed to assess the efficacy and safety of GenSci120 injection in this patient population. The study consists of a screening period (≤ 4 weeks), a placebo-controlled treatment period (14 weeks), an extension treatment period (14 weeks), and a follow-up period (10 weeks), with a total of 17 scheduled visits.