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A novel triple therapy for ITP using high-dose dexamethasone, low-dose rituximab, and cyclosporine (TT4).

Promising reports of combination immunosuppression with high-dose dexamethasone and rituximab for the treatment of primary immune thrombocytopenia (ITP) have recently emerged. They suggest a potential to further optimize the efficacy of therapy. We investigate the use of a novel combination of conventional therapies in ITP given over 4 weeks. From 2011 to 2014, 20 patients were prospectively enrolled onto a single-arm phase 2b study to describe the safety, efficacy, and tolerability of oral dexamethasone 40 mg for days 1 to 4, oral cyclosporine 2.5 to 3 mg/kg daily for day 1 to 28, and intravenous low-dose rituximab 100 mg for days 7, 14, 21, and 28. There were no therapy-related serious adverse side effects, 6-month response rate was 60%, and treatment was well tolerated. Responders enjoyed relapse-free survivals of 92% and 76%, respectively, at 12 and 24 months. This study highlights the possibility of achieving an enduring remission from 4 weeks of therapy. This study is registered at www.anzctr.org.au (#ANZCTRN12611000015943).