To date, the comparative efficacy of tocilizumab and TNFi for patients with RA has only been investigated in a single head-to-head trial and network meta-analyses. This study, ACT-iON, is the first prospective, large-scale, global, multicentre, comparative effectiveness study comparing initiation of intravenous tocilizumab with initiation of a TNFi in patients with RA as the first-line biologic treatment after inadequate response to csDMARDs. Patients were observed in a real-world, clinical pra...