Could hypereosinophilia at diagnosis estimate the current activity or predict relapse in systemic immunosuppressive drug-naïve patients with eosinophilic granulomatosis with polyangiitis?

Eosinophilic Lung Diseases

The eosinophilic lung diseases may manifest as chronic eosinophilic pneumonia, acute eosinophilic pneumonia, or as the Löffler syndrome (generally of parasitic etiology). The diagnosis of eosinophilic pneumonia is made when both characteristic clinical-imaging features and alveolar eosinophilia are present. Peripheral blood eosinophils are generally markedly elevated; however, eosinophilia may be absent at presentation. Lung biopsy is not indicated except in atypical cases after multidisciplinary discussion. The inquiry to possible causes (medications, toxic drugs, exposures, and infections especially parasitic) must be meticulous. Idiopathic acute eosinophilic pneumonia may be misdiagnosed as infectious pneumonia. Extrathoracic manifestations raise the suspicion of a systemic disease especially eosinophilic granulomatosis with polyangiitis. Airflow obstruction is frequent in allergic bronchopulmonary aspergillosis, idiopathic chronic eosinophilic pneumonia, eosinophilic granulomatosis with polyangiitis, and hypereosinophilic obliterative bronchiolitis. Corticosteroids are the cornerstone of therapy, but relapses are common. Therapies targeting interleukin 5/interleukin-5 are increasingly used in eosinophilic lung diseases.

The clinical features and treatment of eosinophilic granulomatosis with polyangiitis (EGPA) in Turkey: one or two distinct diseases?

Eosinophilic granulomatosis with polyangiitis (EGPA) is defined the disease as having two subgroups, ANCA (+) and ANCA (-). We aimed to compare EGPA subgroups in terms of clinical features, outcomes, and treatments. A multidisciplinary team was established under our vasculitis centre since October 2014. Totally 50 EGPA patients were enrolled. Clinical features, treatments, and outcomes (FFS, VDI, relapse) were reviewed. For relapse-free survival analysis, time to first relapse was compared according to ANCA phenotype by Kaplan-Meier survival analysis and log-rank test. 17 (34%) patients were in ANCA (+), 33 (66%) patients were in ANCA (-) group. ANCA (-) patients were significantly younger at the diagnosis time (37.9 ± 14.3 vs 53.8 ± 16.3; p = 0.001) and had more nasal polyposis (45.5% vs 11.8%; p = 0.017). ANCA (+) patients had higher BVAS (17[13] vs 9[4]; p = 0.002), renal involvement and peripheral neuropathy were more common in this group, while cardiac involvement was seen only in ANCA (-) group (n = 3). Biological agents (mepolizumab or rituximab) were prescribed to nine patients in ANCA (-) and two patients in ANCA (+) group. The median duration of follow-up was 47 (IQR 69.9) months. ~ 40% of patients had at least one relapse, but relapse-free survival rate was similar between the groups. However, the predictor of first relapse was elevated Ig E level [OR (95% CI): 6.5 (1.09-38.63) p = 0.04]. Consequently, both clinical features, disease activity, and treatments appear to be significantly different between EGPA subgroups. The relapse risk was similar although clinical features and treatment strategies were different. Also, elevated Ig E levels may be a precursor for the relapse.