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자료유형
학술저널
저자정보
저널정보
대한혈액학회 Blood Research Blood Research Vol.50 No.1
발행연도
2015.1
수록면
19 - 25 (7page)

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BackgroundEltrombopag is a thrombopoietin receptor agonist with excellent treatment outcomes inimmune thrombocytopenia (ITP). Here, we analyzed the dose of eltrombopag requiredto achieve and maintain safe platelet counts in Korean ITP patients. MethodsAdult refractory ITP patients (<30,000 platelets/μL) were enrolled. Eltrombopag doseswere increased to achieve a target platelet count (≥50,000 cells/μL). After achieving thetarget platelet count, the dose of concomitant ITP medications and eltrombopag was reducedto identify the lowest effective dose required to maintain the platelet count. ResultsAmong 18 patients, 66.7% achieved complete response, 5.6% achieved platelet countsbetween 50,000 and 100,000 cells/μL, and 27.8% failed to achieve the target plateletcount. The median ITP duration was significantly shorter in patients who achieved thetarget platelet count. The initial dose required to achieve the target platelet count was25 mg/d. The adjusted maintenance doses were 25 mg twice per week or 25 mg/d. Afterdiscontinuation, 83.3% relapsed, and the median relapse-free survival was 15 days. Tworelapsed and 1 failed patient switched to romiplostim. The response to romiplostim wassimilar to eltrombopag. During eltrombopag treatment, 38.9% showed hepatobiliary laboratoryanomalies. Among 9 follow-up bone marrow examinations, 1 revealed fibrosisafter 1 year of treatment. ConclusionEltrombopag was well tolerated with excellent treatment outcomes in refractory adultITP patients. Low-dose eltrombopag effectively maintained the target platelet count. However, some patients required longer or higher-dose treatment to maintain the targetplatelet count, especially in heavily pretreated or longer ITP cases.

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