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2024-09-23T13:58:46.000Z

Momelotinib in patients with MF and anemia: Subgroup analysis of the SIMPLIFY-2 trial

Sep 23, 2024
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Learning objective: After reading this article, learners will be able to cite a new clinical development in myelofibrosis.

The phase III SIMPLIFY-2 trial (NCT02101268) assessed momelotinib, a JAKi, vs BAT (88.5% continued ruxolitinib) in JAKi-experienced patients with MF.1 Results from this trial were previously reported by the MPN Hub. A post hoc descriptive analysis evaluated outcomes in two patient subgroups: patients with moderate-to-severe anemia, defined by baseline Hb <100 g/L, and patients who were not TI at baseline. Results from this analysis were published in Advances in Therapy by Harrison et al.1

Key learnings

Both patient subgroups showed superior anemia-related outcomes with momelotinib vs BAT; transfusion independence rates at Week 24 were higher in patients with baseline Hb <100g/L (33.3% vs 12.8%) and in patients who were not TI at baseline (34.7% vs 3.0%). Additionally, mean Hb levels in both subgroups improved and remained higher with momelotinib, despite lower or comparable median transfusion rates through Week 24.  

Switching to momelotinib improved anemia management without compromising spleen volume reduction or symptom control; splenic response rates were 9.1% vs 5.1% in patients with Hb <100 g/L and 9.7% vs 3.0% in non-TI patients, while symptom response rates were 32.3% vs 2.6% in patients with Hb <100 g/L and 29.2% vs 0% in non-TI patients. 

Patients continuing BAT/ruxolitinib required additional anemia-supportive therapies such as ESAs; however, this approach provided limited anemia benefits and lower symptoms and spleen control compared with switching to momelotinib. 

These findings suggest that switching to momelotinib instead of continuing ruxolitinib and using ESAs or other supportive therapies may be a more effective strategy for JAKi-experienced patients with MF who have moderate-to-severe anemia or are non-TI.  

Abbreviations: BAT, best available therapy; ESA, erythropoiesis-stimulating agent; Hb, hemoglobin; JAKi, Janus kinase inhibitor; MF, myelofibrosis; TI, transfusion-independent.   

  1. Harrison CN, Vannucchi AM, Recher C, et al. Momelotinib versus continued ruxolitinib or best available therapy in JAK inhibitor-experienced patients with myelofibrosis and anemia: Subgroup analysis of SIMPLIFY-2. Adv Ther. 2024;41(9):3722-3735. DOI: 10.1007/s12325-024-02928-4 

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As a result of this content, I commit to reviewing the latest data with luspatercept to guide my treatment of myelofibrosis-associated anemia.
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