Randomized, open-label, multicenter study to compare the efficacy and safety of combination of tacrolimus and danazol versus danazol for the treatment of adults with steroid-resistant/relapse immune thrombocytopenia (ITP).

The investigators are undertaking a randomized controlled trial of 120 adults with steroid-resistant/relapse ITP in China. Patients were randomized to tacrolimus plus danazol and danazol monotherapy group. Platelet count, bleeding and other symptoms were evaluated before and after treatment. Adverse events are also recorded throughout the study.

Inclusion Criteria:

• Primary immune thrombocytopenia (ITP);
• 18 years older;
• Platelet count of less than 30×10^9/L at enrollment;
• Patients who did not achieve a sustained response to treatment with full-dose corticosteroids for a minimum duration of 4 weeks or who relapsed during steroid-tapering or after its discontinuation;
• Patients who were receiving other maintenance regimens, primarily corticosteroids, ciclosporin, or mycophenolate mofetil, were also eligible if the dose of treatment had been stable in the past month and the dose was expected to be stable after enrolment and remained unchanged at least for the first 4 weeks of study until initial response was assessed, unless severe adverse events were suspected.

Exclusion Criteria:

• Secondary ITP (e.g., patients with HIV, HBV, HCV, Helicobacter pylori infection or SLE);
• Congestive heart failure, severe arrhythmia;
• Nursing or pregnant women;
• ALT or AST levels ≥ 3× the upper limit of the normal threshold;
• Creatinine or serum bilirubin levels ≥ 1.5× the upper limit;
• Active or previous malignancy ;
• Patients who had received danazol treatment or did not respond to danazol;
• Patients unable to have routine blood tests because of reasons such as insufficient time.