Mepolizumab effectiveness for patients with severe, uncontrolled chronic rhinosinusitis with nasal polyps in Italy (MEPOREAL): a real-life, multicentre, phase 4 trial

Study limitation reported by the research below: “The phase 4 label refers to a post-marketing study; however, the lack of a comparator arm means it functions as a single-arm observational study rather than a traditional controlled trial.”