Update of sarilumb to treat rheumatoid arthritis based on randomized clinical trials: a systematic review.

Introduction: Sarilumab is a human monoclonal antibody against Interleukin 6 (IL-6) receptor. Compared to tocilizumab, another IL-6 receptor antibody, sarilumab has a different structure and higher affinity. Areas covered: In a systematic literature review, we examined all sarilumab randomized clinical trials (RCTs) in rheumatoid arthritis. The 6 reviewed RCTs included patients who were inadequate MTX, DMARD and/or TNFi responders. Sarilumab 150-200mg every 2weeks improved RA signs, symptoms, function and decreased radiological progression up to 52weeks. The most common adverse events were infections and neutropenia, the latter of which will require careful observation in future trials.Examination of the effect of sero-positivity, disease duration, presence of erosions, use of previous biologic and comparisons to other biologics etc are still needed to complete understanding of this drug's profile. Long term studies, too, will be needed to assess long term tolerability Expert commentary: Results support the use of sarilumab to treat RA patients with inadequate response to MTX, other DMARDs and TNFis, although further studies are needed to fully assess its toxicity and understand the specific place of sarilumab in the RA armamentarium.