Although age, gender, history of asthma, eosinophil count in the peripheral blood, and positive rate of MPO–ANCA were equivalent among the EGPA patients regardless of the presence of aLf, the serum CRP levels and BVAS in the aLf-positive EGPA patients (n = 4) were significantly higher than those in the aLf-negative EGPA patients (n = 15) (Table 2). Here, MPO is linked to asthma.