Base Study： 220 subjects were randomized in a 1: 1 ratio into the trial, and the treatment group received 100 mg subcutaneous Tildrakizumab at Week 0 and Week 4, 100 mg subcutaneous placebo at Week 12, while the placebo group received 100 mg subcutaneous placebo at Week 0 and Week 4, and 100 mg subcutaneous Tildrakizumab at Week 12, and subjects will be evaluated for efficacy, safety, tolerability, and immunogenicity as specified in this protocol. At the end of the base study, procedures such as data cleaning, locking and unblinding of base study data were performed.~Extension Study： Subjects entered the extension study after completion of the base study and will receive 100 mg subcutaneous Tildrakizumab at Week 16, 28, 40, and 52, and will be evaluated for efficacy, safety, tolerability, and immunogenicity by the investigator according to the regulations of this study.~At the end of the extension study, all data from the extension study will be entered into the database, after the data is reviewed, cleaned, and locked, the entire trial will be analyzed.
This is a phase Ⅲ, randomized, double-blind, placebo-controlled, parallel design, multicenter trial to evaluate the efficacy, safety, tolerability, and immunogenicity of subcutaneous Tildrakizumab in subjects with moderate to severe chronic plaque psoriasis.~The trial was divided into two parts: the base study (Week 0- Week 12) and the extension study (Week 13- Week 54).