Journal
BLOOD
Volume 121, Issue 3, Pages 537-545Publisher
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2012-04-425512
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Funding
- GlaxoSmithKline [NCT00351468]
- GlaxoSmithKline (GSK)
- Amgen
- Cangene
- GSK
- Genzyme
- InG of America
- Immunomedics
- Ligand
- Eisai
- Shionogi
- Sysmex
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Patients with chronic immune thrombocytopenia may have bleeding resulting from low platelet counts. Eltrombopag increases and maintains hemostatic platelet counts; however, to date, outcome has been reported only for treatment lasting <= 6 months. This interim analysis of the ongoing open-label EXTEND (Eltrombopag eXTENded Dosing) study evaluates the safety and efficacy of eltrombopag in 299 patients treated up to 3 years. Splenectomized and nonsplenectomized patients achieved platelets >= 50 000/mu L at least once (80% and 88%, respectively). Platelets >= 50 000/mu L and 2 x baseline were maintained for a median of 73 of 104 and 109 of 156 cumulative study weeks, respectively. Bleeding symptoms (World Health Organization Grades 1-4) decreased from 56% of patients at baseline to 20% at 2 years and 11% at 3 years. One hundred (33%) patients were receiving concomitant treatments at study entry, 69 of whom attempted to reduce them; 65% (45 of 69) had a sustained reduction or permanently stopped >= 1 concomitant treatment. Thirty-eight patients (13%) experienced >= 1 adverse events leading to study withdrawal, including patients meeting protocol-defined withdrawal criteria (11 [4%] thromboembolic events, 5 [2%] exceeding liver enzyme thresholds). No new or increased incidence of safety issues was identified. Long-term treatment with eltrombopag was generally safe, well tolerated, and effective in maintaining platelet counts in the desired range. This study is registered at www.clinicaltrials.gov as NCT00351468. (Blood. 2013;121(3):537-545)
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