In addition, both dexamethasone and clarithromycin was able to similarly suppress the protein production of platelet derived growth factor-BB (PDGF-BB) (Fig. 10c) from sinonasal mucosa from CRSsNP and eosinophilic CRSwNP patients, and mRNA production of transforming growth factor-β1 (TGF-β1) (Fig. 10f) from sinonasal mucosa from eosinophilic CRSwNP. The gene discussed is TGFB1; the disease is chronic rhinosinusitis without nasal polyps.