A Study to Learn About the Study Medicine (Called Tofacitinib) in People With Psoriatic Arthritis

Tofacitinib is an oral Janus kinase (JAK) inhibitor approved in 2017 by the US Food and Drug Administration (FDA) for the treatment of adult patients with active PsA who have had an inadequate response or intolerance to methotrexate or other disease modifying antirheumatic drugs (DMARDs). As of December 3, 2021, Tofacitinib is approved for use in patients who have had an inadequate response or intolerance to one or more TNF blockers. This is an observational retrospective cohort study that will be conducted using patients enrolled in the CorEvitas PsA/SpA Registry, initiating tofacitinib on or after December 14th, 2017. Patients receiving tofacitinib will be included to assess the effectiveness of tofacitinib overall and when stratified by key variables of interest. More specifically, the overall aim will be to describe baseline demographic, therapy history, and disease activity characteristics and assess change in disease activity measures six months after initiation of tofacitinib. There are two primary objectives for this study: 1. To describe the effectiveness of all tofacitinib initiators at 6 months in PsA patients 2. To describe the effectiveness of all tofacitinib initiators at 6 months stratified by monotherapy and combination therapy of PsA