Abstract
Mepolizumab, a monoclonal antibody blocking IL-5, is efficacious in the treatment of severe lung diseases sharing eosinophilic inflammation pattern. The paper describes two cases in which the drug was used with excellent results. The first involved a 14-year-old boy with obliterative bronchiolitis, the other an 11-year-old girl with non-atopic asthma. Both cases shared the eosinophilic phenotype of the disease, defined by an eosinophilic count in the peripheral blood equal to or greater than 2% (i.e. a baseline value of 150-200 cells/µl or 300 cells/µl during the previous year). Its use demonstrates clinical improvement in severe refractory asthma with eosinophilic phenotype and as off-label drug in obliterative bronchiolitis, leading to a decrease in the rate of exacerbations and enabling the reduction of corticosteroids as well as the resolution of structural anomalies, respectively.
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