Emerging biological drugs: A new therapeutic approach for Systemic Lupus Erythematosus. An update upon efficacy and adverse events

B-cells abnormalities leading to autoantibody production play a central role in Systemic Lupus Erythematosus (SLE) pathogenesis. B-cell targeted therapies, including anti-B lymphocyte stimulator (BLyS) and anti-CD20 monoclonal antibodies, are at forefront of new SLE treatments. Biologic agents targeting specific pathways (i.e. T-B lymphocyte interaction, cytokines and complement) have been also proposed as new tools for SLE treatment. In this review we will focus on biological drugs whose potential efficacy has been evaluated in open-label and randomized clinical trials.