Older age, higher subjective disease activity, and exercising for more than 120 minutes per week were three factors linked to patients with ankylosing spondylitis (AS) who switched from their original tumor necrosis factor inhibitor (TNFi) treatment within 2 years in a U.S.-based study. Data from the Prospective Study of Outcomes in Ankylosing Spondylitis (PSOAS) also […]