Abstract
ObjectiveTo estimate survival in Swedish and Norwegian myelofibrosis (MF) patients who received ruxolitinib.MethodsSwedish and Norwegian patients with MF diagnosis in the National Cancer Registries (Sweden: 2001‐2015; Norway: 2002‐2016) and ≥1 record of ruxolitinib in the Prescribed Drug Registries (2013‐2017) were included. Patients were followed from ruxolitinib initiation until death or end of follow‐up; those who discontinued ruxolitinib were followed from ruxolitinib discontinuation. Relative survival (RS) and excess mortality rate ratios (EMRRs) were calculated vs a matched general population. Average loss in life expectancy (LEL) was predicted using flexible parametric models.ResultsAmong patients who initiated ruxolitinib (n = 190), 1‐ and 4‐year RS were 0.80 (95% confidence interval [CI]: 0.74, 0.86) and 0.52 (95% CI: 0.42, 0.64), respectively, and LEL was 11 years. EMRR was greater in patients aged >70 vs <60 years (3.16; 95% CI: 1.34‐7.40). Among patients who discontinued ruxolitinib (n = 71), median RS was 16.0 months (95% CI: 6.3, NE), and LEL was 12 years. After ruxolitinib treatment discontinuation, Swedish patients (n = 37) received glucocorticoids, hydroxyurea, busulfan, danazol and lenalidomide.ConclusionSwedish and Norwegian MF patients who discontinued ruxolitinib had dismal survival outcomes and limited subsequent treatment options, highlighting the need for improved therapies.
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