I studie I, II og V sammenlignedes effekt og sikkerhed af abatacept med placebo hos patienter, der havde utilstrækkeligt respons på methotrexat, og som fortsatte med stabil methotrexatdosis.
In Studies I, II, and V the efficacy and safety of abatacept compared to placebo were assessed in patients with an inadequate response to methotrexate and who continued on their stable dose of methotrexate.