1. Fostamatinib or Thrombopoietin for the Treatment of Chronic Immune Thrombocytopenia in Adult Patients: A Real-World Assessment of Safety, Effectiveness and Cost.
- Author
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Dranitsaris G, Peevyhouse A, Wood T, Kreychman Y, Neuhalfen H, and Moezi M
- Subjects
- Humans, Male, Female, Middle Aged, Adult, Retrospective Studies, Aged, Pyridines therapeutic use, Pyridines adverse effects, Pyridines economics, Recombinant Fusion Proteins therapeutic use, Recombinant Fusion Proteins economics, Recombinant Fusion Proteins adverse effects, Chronic Disease, Pyrimidines therapeutic use, Pyrimidines adverse effects, Pyrimidines economics, Benzoates therapeutic use, Benzoates adverse effects, Benzoates economics, Platelet Count, Cost-Benefit Analysis, Treatment Outcome, Aminopyridines, Thiazoles, Thiophenes, Purpura, Thrombocytopenic, Idiopathic drug therapy, Thrombopoietin therapeutic use, Thrombopoietin adverse effects, Thrombopoietin economics, Hydrazines therapeutic use, Hydrazines adverse effects, Hydrazines economics, Pyrazoles therapeutic use, Pyrazoles adverse effects, Pyrazoles economics, Receptors, Fc therapeutic use, Morpholines therapeutic use, Morpholines adverse effects, Morpholines economics, Oxazines therapeutic use, Oxazines adverse effects
- Abstract
Introduction: Chronic immune thrombocytopenia purpura (ITP) in adults is a serious autoimmune disease in which platelets are prematurely destroyed, leaving the patient vulnerable to bruising and bleeding. Initial treatment starts with corticosteroids. In patients who become resistant or intolerant to corticosteroids, the thrombopoietic agents (TPOs), consisting of romiplostim (ROM), eltrombopag (ELT), and avatrombopag (AVA), or the spleen tyrosine kinase inhibitor fostamatinib (FOS), are appropriate next lines of therapy. In this study, the comparative safety, effectiveness, and cost of care between fostamatinib and the TPOs were evaluated in a real-world setting., Methods: A retrospective analysis of 17 community hematology practices across the USA was conducted to identify adult ITP patients who received one of the four agents. Data collection consisted of patient demographics, disease characteristics, as well as number and type of prior treatments. From the first day until the end of treatment, data were also collected on platelet (PLT) counts, adverse events, the use of rescue IVIG, platelet transfusions, and corticosteroids. Multivariable logistic regression analysis was used to compare PLT-related endpoints between agents., Results: A sample of 179 ITP patients who had received at least one of the four agents was identified. This resulted in a final sample of 51, 87, 127, and 44 patients who received FOS, ELT, ROM, or AVA, respectively. At month six, there were no significant differences between FOS and the TPOs in terms of the proportion of patients with the PLT count being ≥30 × 103/μL, ≥50 × 103/μL as well as the proportion of patients whose PLT levels doubled relative to baseline. The frequency of thromboembolic events (TEs) was 3.9% in FOS patients compared to 9.2%, 4.7%, and 11.4% in the ELT, ROM, and AVA groups. The mean cost per patient with FOS was $99,209 (95% CI: $59,595-$115,074), compared to $92,426 (95% CI: $68,331-$115,519), $108,482 (95% CI: $84,782-$132,182), and $131,050 (95% CI: $83,327-$179,897) for ELT, ROM, or AVA, respectively., Conclusions: In this real-world analysis, FOS was comparable to the TPOs in maintaining PLTs at clinically beneficial levels. Given these findings, the choice of therapy should be based on overall patient safety, preexisting risk factors for TEs, and cost effectiveness., (© 2023 The Author(s). Published by S. Karger AG, Basel.)
- Published
- 2024
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