Abstract: The present specification disclose methods and uses for the treatment of a vasculitic syndrome. The disclosed methods comprise administering a composition comprising a Proteinase 3 (PR3) inhibitor to a patient in need thereof. Also disclosed are compositions comprising a PR3 inhibitor disclosed herein for use in the treatment of a vasculitic syndrome as well as use of a composition comprising a PR3 inhibitor disclosed herein in the treatment of a vasculitic syndrome. The present specification also discloses use of a composition comprising a PR3 inhibitor disclosed herein in the manufacture of a medicament for the treatment of a vasculitic syndrome.