Abstract
We report four cases of successful treatment with certolizumab pegol (CZP) of rheumatoid arthritis (RA) patients with persistent inflamed residual mono- or oligosynovitis resistant to prior TNF-α inhibitors. Although the patients were in a moderate disease activity, a low activity, or a remission of RA, they sustained inflammatory mono-/oligoarthritis even after treatment with prior TNF inhibitors. They were then all treated with CZP and observed in a serial ultrasonography. In all cases, the positive power Doppler signals in the joint have disappeared promptly and all of the patients were able to retain remission in the long term. The treatment of CZP to the refractory mono-/oligoarthritis of inflammatory synovitis in RA patients has not been previously described. The cases suggest that it may be associated with the feature of CZP, possible effective penetration into the site of inflammation.
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