ASAS, Assessment of SpondyloArthritis international Society; ASAS20, 20% improvement in ASAS criteria; BL, baseline; i.v., intravenous; q4wk, every 4 weeks; PBO, placebo; R, randomization; s.c., subcutaneous; TNF, tumor necrosis factor; wk, week. Here, TNF is linked to spondyloarthropathy.