If other systemic vasculitides are suspected, the search for antibodies against the cytoplasm of neutrophilic leukocytes (ANCA) should be made, whereby there is an association between EGPA and microscopic polyangiitis (MPA) with p-ANCA (anti-MPO-ANCA) and GPA with c-ANCA (anti-PR3-ANCA). The gene discussed is PRTN3; the disease is granulomatosis with polyangiitis.