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Updated: Mar 31, 2026

A Method for Screening and Validation of Resistant Mutations Against Kinase Inhibitors
Published on: December 7, 2014
Ruxolitinib reverses systemic vasculitis driven by JAK2 V617F-mutated essential thrombocythemia: a case report
Yutaro Ashida1, Shinji Ota1, Nao Ishidoya1
1Department of Gastroenterology, Hematology, and Clinical Immunology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan.
Background:
Vasculitis associated with myeloproliferative neoplasms is rare, and reports on its treatment are limited. Herein, we report a case of Janus Kinase2 (JAK2) V617F mutation-positive essential thrombocythemia (ET) associated with vasculitis.
Case Presentation:
A 60-year-old man with JAK2 V617F mutation-positive ET underwent coronary artery bypass grafting after recurrent myocardial infarctions and coronary stent occlusions. Intraoperative and pathological findings led to a diagnosis of vasculitis. Treatment with hydroxycarbamide and ruxolitinib resulted in decreased platelet counts and improved vasculitis, with no subsequent recurrence of cardiovascular events.
Conclusion:
This rare case shows that ruxolitinib can be effective in treating vasculitis complications in patients with JAK2 mutation-positive ET.
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