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Dexpramipexole depletes blood and tissue eosinophils in nasal polyps with no change in polyp size

Chronic rhinosinusitis with nasal polyps (CRSwNP) and eosinophilia is a disease of the upper respiratory tract for which few therapies are available. Because the oral investigational drug dexpramipexole serendipitously decreased blood eosinophils in amyotrophic lateral sclerosis studies, we assessed its safety, eosinophil‐lowering activity, and preliminary clinical efficacy in patients with CRSwNP and eosinophilia.