RT Journal Article SR Electronic T1 Design and rationale of the Study of Etanercept and Methotrexate in Combination or as Monotherapy in Subjects with Psoriatic Arthritis (SEAM-PsA) JF RMD Open JO RMD Open FD EULAR SP e000606 DO 10.1136/rmdopen-2017-000606 VO 4 IS 1 A1 Philip J Mease A1 Dafna D Gladman A1 Ahmed S Samad A1 Laura C Coates A1 Lyrica X H Liu A1 Girish A Aras A1 David H Collier A1 James B Chung YR 2018 UL http://rmdopen.bmj.com/content/4/1/e000606.abstract AB Objective To evaluate the efficacy of etanercept and methotrexate as monotherapies and as combination therapy in subjects with active psoriatic arthritis (PsA).Methods The Study of Etanercept and Methotrexate in Combination or as Monotherapy in Subjects with Psoriatic Arthritis (SEAM-PsA) is an ongoing, global, double-blind, 48-week, randomised, controlled study. Subjects are randomised (1:1:1) to etanercept monotherapy, methotrexate monotherapy or etanercept-methotrexate combination therapy. Endpoints include rates of ACR20 response and Minimal Disease Activity, measures to characterise extra-articular manifestations (dactylitis, enthesitis, nail disease) and safety.Conclusion SEAM-PsA will characterise the effects of etanercept with and without background methotrexate and methotrexate alone on PsA manifestations, and provide information of practical importance to clinicians on the optimal treatment of PsA.