[Novel B-cell directed strategies for the treatment of rheumatic diseases].

The clinical success of B-cell depletion using the anti-CD20 antibody rituximab has sparked a new era in the therapy of rheumatic diseases. A large variety of novel B-cell directed biologic agents has been developed recently. The new strategies not only aim at depleting B-cells (ocrelizumab, veltuzumab, ofatumumab, TRU-015) but also target essential survival and proliferation factors such as BAFF (belimumab, atacicept, briobacept), and are directed at modulating B-cell function via CD22 (epratuzumab), inhibition of costimulation (abatacept) and induction of tolerance (abetimus). Thus far, clinical trials indicate high efficacy comparable to rituximab as well as a good safety profile. This review summarizes the therapeutic mechanisms of the novel B-cell directed agents and the current status of clinical trials in rheumatic diseases.