90 IgG4-RD patients with superficial organ involvement are enrolled in this study and randomly divided into three groups at a 1:1:1 ratio: patients in group I are treated with Diprospan (1mL im) and then with iguratimod (25mg bid); patients in group Ⅱ are treated with Diprospan (1mL im) and then with leflunomide (10-20mg qd); and patients in group Ⅲ are treated with prednisone (20 mg qd and taper to ≦ 5mg in 3 months) and leflunomide (10-20mg qd). All patients will be followed up for 12 months, and clinical evaluations, laboratory tests, image examinations and IgG4-RD responder index (RI) will be recorded during follow up. The primary endpoint is the difference of relapse rate between two groups at 12 months. The secondary endpoints are relapse time, response rate and side effects.
This study has been designed as a 12-month, open-label randomized controlled clinical trial. The study aims to compare the efficacy and safety of three treatment strategies in IgG4-RD patients with superficial organ involvement: Diprospan plus iguratimod, Diprospan plus leflunomide and prednisone plus leflunomide.