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Paolo Cameli,1 Maria Aliani,2 Elena Altieri,3 Pietro Bracciale,4 Luisa Brussino,5 Maria Filomena Caiaffa,6 Giorgio Walter Canonica,7,8 Cristiano Caruso,9 Stefano Centanni,10 Maria D’Amato,11 Fausto De Michele,12 Stefano Del Giacco,13 Fabiano Di Marco,14 Girolamo Pelaia,15 Paola Rogliani,16,17 Micaela Romagnoli,18 Pietro Schino,19 Jan Walter Schroeder,20 Gianenrico Senna,21 Alessandra Vultaggio,22 Marco Benci,23 Silvia Boarino,24 Francesco Menzella25 1Respiratory Diseases Unit, Department of Medicine, Surgery and Neurosciences, University of Siena, Siena, Italy; 2UO Pneumologia e Pneumologia Riabilitativa, ICS Maugeri, IRCCS Bari, Bari, Italy; 3Reparto di Pneumologia, P.O. Garbagnate Milanese, Garbagnate Milanese (MI), Italy; 4Reparto di Pneumologia, Ospedale Ostuni, Ostuni (BR), Italy; 5Dipartimento di Scienze Mediche, Università degli Studi di Torino; SCDU Immunologia e Allergologia, AO Ordine Mauriziano Umberto I, Torino, Italy; 6Cattedra e Scuola di Allergologia e Immunologia Clinica, Dipartimento di Scienze Mediche, Università di Foggia, Foggia, Italy; 7Department of Biomedical Sciences, Humanitas University, Pieve Emanuele (MI), Italy; 8Personalized Medicine Center: Asthma and Allergology, Humanitas Research Hospital, Rozzano (MI), Italy; 9Dipartimento di Scienze Mediche e Chirurgiche, Fondazione Policlinico A. Gemelli, IRCCS, Università Cattolica del Sacro Cuore, Roma, Italy; 10Respiratory Unit ASST Santi Paolo e Carlo, Department of Health Sciences Universita’ degli Studi di Milano, Milano, Italy; 11UOSD Malattie Respiratorie “Federico II”, Ospedale Monaldi, AO Dei Colli, Napoli, Italy; 12UOC Pneumologia e Fisiopatologia Respiratoria, AORN A. Cardarelli, Napoli, Italy; 13Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy; 14Department of Health Sciences, Università Degli Studi Di Milano, Pneumologia, ASST Papa Giovanni XXIII, Bergamo, Italy; 15Dipartimento di Scienze della Salute, Università Magna Graecia, Catanzaro, Italy; 16Division of Respiratory Medicine, University Hospital “Tor Vergata”, Roma, Italy; 17Unit of Respiratory Medicine, Department of Experimental Medicine, University of Rome “Tor Vergata”, Roma, Italy; 18UOC Pneumologia, AULSS 2 Marca Trevigiana, Treviso, Italy; 19Fisiopatologia Respiratoria, Ospedale Generale Regionale, Ente Ecclesiastico “F. Miulli”, Acquaviva delle Fonti (BA), Italy; 20Allergy and Clinical Immunology, ASST Grande Ospedale Metropolitano Niguarda, Milano, Italy; 21Allergy Unit and Asthma Center, Verona University Hospital, Verona, Italy; 22Dipartimento di Medicina Sperimentale e Clinica, Università degli Studi di Firenze, Firenze, Italy; 23Medical Affairs R&I, AstraZeneca, Milano, Italy; 24Medical Evidence R&I, AstraZeneca, Milano, Italy; 25Pulmonology Unit, Ospedale “S. Valentino”, AULSS 2 Marca Trevigiana, Montebelluna (TV), ItalyCorrespondence: Paolo Cameli, Respiratory Diseases Unit, Department of Medicine, Surgery and Neurosciences, University of Siena, Siena, Italy, Email paolo.cameli@unisi.itPurpose: Severe eosinophilic asthma (SEA) patients often present overlapping inflammatory features rendering them eligible for multiple biologic therapies; switching biologic treatment is a strategy adopted to optimize asthma control when patients show partial or no response to previous biologics.Patients and Methods: ANANKE is a retrospective, multicenter Italian study (NCT04272463). Here, we outline the characteristics and long-term clinical outcomes in naïve-to-biologics and biologics-experienced patients treated with benralizumab for up to 96 weeks. Bio-experienced patients were split into omalizumab and mepolizumab subsets according to the type of biologic previously used.Results: A total of 124 (76.5%) naïve and 38 (23.5%) bio-experienced patients were evaluated at index date; 13 patients (34.2%) switched from mepolizumab, 21 patients (55.3%) switched from omalizumab, and four patients (10.5%) received both biologics. The mepolizumab subset was characterized by the longest SEA duration (median of 4.6 years), the highest prevalence of chronic rhinosinusitis with nasal polyposis (CRSwNP) (76.5%), and the greatest oral corticosteroid (OCS) daily dosage (median of 25 mg prednisone equivalent). The omalizumab group showed the highest severe annual exacerbation rate (AER) (1.70). At 96 weeks, treatment with benralizumab reduced any and severe AER by more than 87% and 94%, respectively, across all groups. Lung function was overall preserved, with major improvements observed in the mepolizumab group, which also revealed a 100% drop of the median OCS dose. Asthma Control Test (ACT) score improved in the naïve group while its increment was more variable in bio-experienced patients; among these, a marked difference was noticed between omalizumab and mepolizumab subsets (median ACT score of 23.5 and 18, respectively).Conclusion: Benralizumab promotes durable and profound clinical benefits in naïve and bio-experienced groups, indicating that a nearly complete depletion of eosinophils is highly beneficial in the control of SEA, independently of previous biologic use.Keywords: benralizumab, asthma, eosinophils, switch, long-term