Table 2. The prevalence of antineutrophil cytoplasmatic autoantibodies (ANCA) in small blood vessels vasculitis (5).

VASCULITIS	PR3-ANCAa (C-ANCA , % )	MPO-ANCAb (P-ANCA, %)	NEGATIVE ANCA
Wegener’s granulomatosis	75	20	5
Microscopic polyangiitis	40	50	10
Churg-Strauss syndrome	10	60	30
Microscopic polyangiitis limited to kidney	20	70	10

^a PR3 = proteinase 3; ^b MPO=myeloperoxidase