It was reported that proteinase 3‐ANCA (PR3‐ANCA) and myeloperoxidase‐ANCA (MPO‐ANCA) are not only important for the characterization of vasculitis but also have diagnostic and prognostic utility in diseases that cause systemic granulomatous vasculitis (Kipar et al., 2005; Schönermarck et al., 2014). This evidence concerns the gene MPO and vasculitis.