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PURPOSE Nasal polyp formation is a common sequela of prolonged chronic rhinosinusitis, but the mechanism underlying this disease state is still controversial. We compared the expressions of Cl- channels/transporters in nasal polyps with those in inferior turbinates to explore whether a deficiency in Cl- transport may participate in the pathophysiology of nasal polyp formation as in patients with cystic fibrosis. METHODS Nasal polyps and inferior turbinates were collected from 12 chronic rhinosinusitis patients with hypertrophic rhinitis a