Biological therapies: New treatment options for ANCA-associated vasculitis?

Biological therapies enable us to apply highly selective targeting components to modulate the immune response. Until now, a few controlled studies investigated the efficacy of TNF-α blocking agents in systemic vasculitis have been carried out, but, in general, they were falling short of expectations. However, there is conducive evidence that TNF-α blockers are advantageous in antineutrophil cytoplasmic antibodies (ANCA)-associated vasculitis, at least in selected disease stages. Likewise, although the efficacy of the monoclonal CD20 antibody rituximab in ANCA-associated vasculitis is obvious, the effect on predominantly granulomatous disease activity in Wegener's granulomatosis is less clear. In addition, interferon-α is used for induction treatment particularly in Churg-Strauss syndrome. Even though the effectiveness and safety of short-term administration was confirmed by case series, severe side effects after long-term treatment relativized the initial results. This review presents the recent data on the use of biologicals in vasculitis and appraises the knowledge in the clinical context.