TNFSF11 and psoriatic arthritis: In this study, we investigated alternation of circulating osteoclastogenesis related cytokines (TNF-α, OPG and RANKL) and adipokines (leptin, adiponectin, resistin, chemerin, omentin) in psoriatic arthritis patients, and their correlation with osteoclast precursors, radiographic damage scores and disease activity index.