CST1 and Nasal polyposis: In addition, the expression levels of CST1 in the nasal mucosa and nasal polyps of ACRSwNP patients were positively correlated (r = 0.850, p = 0.002), and the expression levels in the nasal epithelium and bronchial epithelium were also positively correlated (r = 0.454, p = 0.001).