A quarter of active rheumatoid arthritis (RA) patients receiving either 10mg (24.6%) or 15mg (28.1%) twice daily of the investigational oral JAK-3 (janus-associated kinase) inhibitor CP-690,550 (CP) achieved ACR70* after 12 weeks, according to the results of a new study presented at EULAR 2009, the Annual Congress of the European League Against Rheumatism in Copenhagen, Denmark. The primary outcome for the study was ACR20*, with 75.4% of patients achieving this measure at 12 weeks for both 10mg and 15mg doses.
The study also showed that, comparatively, the ACR70* responses for adalimumab (ADA, a monoclonal antibody and anti-TNF) and placebo, were 3.8% and 5.1% respectively at the same follow up point.