Cellular analysis of sinonasal secretions in CRSwNP patients more often shows a Th2 bound inflammation whereas the presence of eosinophil-rich mucin may be considered an easy-to-obtain biomarker for predicting recurrence of CRSwNP with higher need for surgery and for predicting asthma development (56). The gene discussed is MUC5AC; the disease is chronic rhinosinusitis with nasal polyps.