LAUSR

To date, all available data regarding the switch from bio-originator to its biosimilar are reassuring, and the switch has been recommended as a shared patient–physician decision in recent consensus-based recommendations.1 In particular, the Norway's infliximab switching study (NOR-SWITCH study), a 52-week randomised double-blind trial, strongly supports the efficacy and safety of the switch from originator infliximab (OI) to its biosimilar CT-P13 in patients with a stable disease.2 However, long-term follow-up data are required to confirm the efficacy and safety of the switch. In a previous real-life study, we demonstrated a high acceptance of 89% (89/100) and a 72% (64/89) retention rate after a median follow-up of 33 weeks in a cohort of patients with stable rheumatic diseases switched from OI to CT-P13.3 This retention rate was lower compared with two control cohorts: a historic cohort of 82 patients treated with OI in 2013, and …