Abstract |
Stimulation of platelet production by thrombopoietin-receptor agonists (TPO-RAs) is an effective second-line treatment in immune thrombocytopenia ( ITP). This 28-day phase 2 study assigned subjects with ITP of ≥3 months to once-daily oral avatrombopag (2.5, 5, 10, or 20 mg), an investigational nonpeptide TPO-RA active in humans, or placebo; subjects completing randomized treatment could enroll in a 24-week extension study. Of 64 randomized subjects, 13% ( avatrombopag 2.5 mg), 53% (5 mg), 50% (10 mg), and 80% (20 mg), vs 0% for placebo, achieved a platelet count (PC) response of ≥50 × 10(9)/L with ≥20 × 10(9)/L increase above baseline at day 28. Fifty-three subjects (83%) entered the extension: 52% and 76% had a durable (PC response at ≥75% of their platelet assessments over the last 14 weeks) and overall (stable response or response at any ≥2 consecutive visits) response, respectively. All subjects experienced ≥1 adverse event (AE) (most commonly fatigue, headache, and epistaxis); 19% (n = 12) reported ≥1 serious AE; 10 (16%) withdrew due to an AE (5 due to increased PC). Avatrombopag was active and generally well tolerated, with PC response rates and AE incidence comparable with other TPO-RAs. These studies were registered at www.clinicaltrials.gov as #NCT00441090 and #NCT00625443.
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Authors | James B Bussel, David J Kuter, Louis M Aledort, Craig M Kessler, Adam Cuker, Kelly B Pendergrass, Shande Tang, Joe McIntosh |
Journal | Blood
(Blood)
Vol. 123
Issue 25
Pg. 3887-94
(Jun 19 2014)
ISSN: 1528-0020 [Electronic] United States |
PMID | 24802775
(Publication Type: Clinical Trial, Phase II, Journal Article, Multicenter Study, Randomized Controlled Trial, Research Support, Non-U.S. Gov't)
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Copyright | © 2014 by The American Society of Hematology. |
Chemical References |
- Drugs, Investigational
- Receptors, Thrombopoietin
- Thiazoles
- Thiophenes
- avatrombopag
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Topics |
- Administration, Oral
- Adult
- Aged
- Chronic Disease
- Dose-Response Relationship, Drug
- Double-Blind Method
- Drugs, Investigational
(administration & dosage, adverse effects, therapeutic use)
- Epistaxis
(chemically induced)
- Fatigue
(chemically induced)
- Female
- Headache
(chemically induced)
- Humans
- Male
- Middle Aged
- Platelet Count
- Purpura, Thrombocytopenic, Idiopathic
(drug therapy, pathology)
- Receptors, Thrombopoietin
(agonists)
- Thiazoles
(administration & dosage, adverse effects, therapeutic use)
- Thiophenes
(administration & dosage, adverse effects, therapeutic use)
- Time Factors
- Treatment Outcome
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