Thrombopoietin Receptor Agonist (ELTROMBOPAG) for Chronic Immune Thrombocytopenic Purpura (ITP) Treatment: 21 Patients in Only One Center

Abstract 4658 Introduction ITP management has changed since thrombopoietin receptor agonists (TRAs) were approved for its treatment. Current TRAs are recommended for adults at risk of bleeding who relapse after splenectomy, as well as for those where splenectomy is contraindicated and where, at least, one other therapy has failed. The goal of this paper is to present the results of the treatment and follow-up of 21 patients treated with Eltrombopag in our Centre during the last year. Patients We present 21 patients diagnosed with chronic ITP according to the American Society of Hematology guidelines. 7 of them were males and 14 females. The median age was 70 years (range from 26 to 81 years). Previous splenectomy was undergone in 3 patients. 10 patients had previously received two or more therapies for ITP. 11 patients received TRAs as second line treatment. Results On average, platelet counts at the beginning of the treatment with Eltrombopag were 23.000/μL. All patients started with the same doses (50 mg) except one of them who started with 25 mg. Patients only received concurrent ITP therapy (corticosteroids and intravenous immunoglobulins) when platelet counts were under 20,000/μL or bleeding occurred. 8 patients needed rescue medications throughout the treatment with Eltrombopag (7 of them only once). Eltrombopag was withdrawn in a total number of 8 patients due to different reasons: 4 patients were considered as non-responders (3 of them didn9t achieve a certain platelet count to prevent major bleeding and, in the fourth one, reducing or suspending the concurrent ITP therapy was not possible. One of these non-responders received Romiplostin and a good response was achieved). In one patient, the therapy was withdrawn due to liver toxicity and in another one, at patient9s request. Finally, Eltrombopag was withdrawn in 2 patients because a sustained platelet counts was held. Conclusion TRAs are safe, effective and well-tolerated for those patients who relapse after splenectomy or when splenectomy is contraindicated. In our experience, TRAs could be also useful in other diseases like HCV or HIV associated thrombocytopenia. Eltrombopag and Romiplostin bind in different places to the TPO receptor (TPO-R). This circumstance, together with the different activation pathways, may explain that some non-responders to Eltrombopag could respond to Romiplostin and viceversa. Disclosures: No relevant conflicts of interest to declare.