The latter observation was made in both types of AAV, PR3 + and MPO + vasculitis (7.2 ± 5.6 vs. 28.6 ± 35.9 pg/ml, p < 0.0001 and 9.6 ± 6.1 vs. 28.6 ± 35.9 pg/ml; p < 0.004). This evidence concerns the gene MPO and vasculitis.