Abstract
Psoriatic arthritis (PsA) is a chronic inflammatory seronegative spondyloarthritis associated with psoriasis. While TNF-α inhibitors have revolutionized the treatment of rheumatic diseases, including PsA, not all patients respond to these agents while others are unsuitable or intolerant to them. Thus, there is a need for additional treatment modalities with a novel mechanism of action. In the past years, the IL-23/Th17 axis has emerged as an important mechanism in the pathogenesis of PsA. Ustekinumab, a fully human IgG1κ monoclonal antibody that targets the common subunit p40 of IL-12 and IL-23, has been shown in clinical trials, to be well-tolerated and effective in patients with active PsA. It improved signs and symptoms of PsA, inhibited radiographic progression and was effective in dactylitis, enthesitis, and skin disease, with a safety profile consistent with the one observed in patients with psoriasis. Moreover, it was to be effective in anti-TNF-α experienced patients, definitely fulfilling an unmet need in the management of PsA.
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