CST1 and nasal cavity polyp: Correlation analysis showed that the expression levels of CST1 in nasal mucosa and nasal polyps of ACRSwNP patients were positively correlated (r = 0.850, p = 0.002), and the expression levels of CST1 in the nasal epithelium and bronchial epithelium were also positively correlated (r = 0.454, p = 0.001) (Figure 7B).