RecruitingReAl-woRld Evaluation of tEzepelumab for Chronic rhinoSinusitis With Nasal Polyps in RussiaARES is a multi-centre, retrospective-prospective, non-comparative and non-interventional (observational) cohort study involving primary and secondary data collection within real-world settings of participants who have initiated tezepelumab (no more than 4 weeks before inclusion) for treatment of CRSwNP (with or without comorbid asthma).