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MPN Hub spotlight: Ruxolitinib for MF

Nov 28, 2025

Learning objective: After reading this article, learners will be able to state the mechanism of action for ruxolitinib in MF and discuss the pivotal and latest data.


Do you know... What was the median duration of SVR35 response in patients with myelofibrosis treated with ruxolitinib in the COMFORT-I and COMFORT-II trials?

Ruxolitinib, an oral Janus kinase 1/2 (JAK1/JAK2) inhibitor, was first approved by the U.S. Food and Drug Administration (FDA) in 2011 for the treatment of patients with intermediate- or high-risk myelofibrosis (MF), including primary MF, post-polycythemia vera (PV) MF, and post-essential thrombocythemia MF, and remains a mainstay of treatment for these patients.1,2 Ruxolitinib targets primary drivers of MF including constitutive Janus kinase (JAK) and signal transducer and activator of transcription (STAT) pathway activation, thereby regulating inflammatory cytokine signaling and hematopoiesis.1,3  

The phase III COMFORT-I (NCT00952289) and COMFORT-II (NCT00934544) trials demonstrated spleen and symptom responses of ruxolitinib 15–20 mg twice daily at Week 24 and Week 48, respectively, in patients with intermediate-2 or high-risk MF.4,5 

Ruxolitinib is now under investigation in new formulations and in combination with other agents in several ongoing trials. Explore our mini-module to find out more. 

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This educational resource is independently supported by Incyte. All content was developed by SES in collaboration with an expert steering committee. Funders were allowed no influence on the content of this resource. 

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