This is a case-control observational study on blood samples. The primary goal of this study is to identify the epigenetic marks that can distinguish patients suffering from Eosinophilic Granulomatosis with Polyangiitis (EGPA) from healthy individuals. The secondary goal is to identify epigenetic or transcriptional marks that can predict if a patient with EGPA will benefit from therapy with Mepolizumab. This study is observational, meaning there will be no alterations of patients' routine clinical care. A blood sample will be drawn for each patient. If the patient will undergo treatment with Mepolizumab (based on routine clinical care), then the blood sample will be drawn before Mepolizumab initiation. The blood samples will be used for genome-wide DNA methylation profiling and for transcriptomic profiling. Healthy individuals as controls for the association study will not be recruited. In fact, the epigenetic and transcriptomic data obtained from EGPA patient blood will be compared against already available genome-wide DNA methylation and transcriptomic profiles of the blood of healthy individuals from previous studies. A total of 300 patients with EGPA will be recruited for the study. The first part of the study, corresponding to the primary goal, will involve all of the 300 patients. The second part of the study, corresponding to the secondary goal, will involve a study population subset consisting of 50 patients.
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Epigenome-Wide Association Study
Timeframe: Through study completion, an average of 1 year
Mepolizumab Therapy Response
Timeframe: 6 months and 12 months after Mepolizumab therapy initiation