Clinical effectiveness of CT-P13 (Infliximab biosimilar) used as a switch from Remicade (infliximab) in patients with established rheumatic disease. Report of clinical experience based on prospective observational data.

Objective: To gain clinical experience on the effectiveness and safety of switching from infliximab-Remicade(INX) to infliximab-biosimilar-CT-P13(INB) in patients with established rheumatic disease.Methods: Patients receiving INX treatment at a rheumatology clinic consented to switching from INX to INB. Patient reported outcomes (PROs), disease-activity, and inflammatory markers were recorded at every visit. Generalized estimating equation models and time-dependent area under the curve (AUC) before/during INX and INB treatments were employed.Results: Thirty-nine consecutive patients [mean (SD) age 53 (11), 17 F] with various rheumatic diseases were switched to INB after a mean (SD) of 4.1 (2.3) years on INX. Thirty-one patients were on concomitant methotrexate. At a median (range) of 11 (7.5-13) months following the first administration of INB, AUCs for disease activity and PROs were similar for INX and INB. They were better compared to those prior to INX. Eleven patients (28.2%) discontinued INB, due to ...