This article focuses on the development of new small molecular inhibitors of Janus kinases (Jaks) in clinical trials for rheumatoid arthritis (RA). Of these, tofacitinib is at the most advanced stage of its clinical development and this article includes an overview of the results from the main tofacitinib clinical trials to date. These include the ORAL-Start study in methotrexate (MTX)-naïve patients; ORAL-Scan in inadequate responders to MTX; ORAL-Solo and ORAL-Sync in inadequate responders to ...

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