Subjects are identified based on whether they received tofacitinib in 2 completed Phase 2 studies who either discontinued treatment prematurely or who did not elect to enroll in long-term extension studies. Subjects are pre-identified
This is an observational study designed to collect follow-up clinical date on subjects who were treated with tofacitinib in 2 completed Phase 2 studies who either discontinued treatment prematurely or did not elect to enroll in long-term extension studies.