IL4R and chronic rhinosinusitis with nasal polyps: While nasal secretion analysis shows promise for disease endotyping, current biomarkers remain limited for accurate stratification, disease monitoring, and prediction of treatment response.<h4>Objective</h4>This study aimed to investigate the inflammatory patterns in nasal secretions of patients with type 2 Chronic Rhinosinusitis with Nasal Polyps (CRSwNP) undergoing treatment with dupilumab, an anti-IL4Rα antibody.