Comparative effectiveness and drug survival of biosimilar infliximab CPT-13 vs. reference infliximab in inflammatory bowel disease: A retrospective cohort study

Background: Studies have investigated the efficacy and safety of switching to the biosimilar infliximab (CT -P13) in patients with inflammatory bowel disease (IBD). However, there is limited research directly comparing the effectiveness, drug survival, and pharmacokinetic profiles of the reference infliximab (IFX) and CT -P13 in real clinical settings. Objective: To compare the effectiveness and drug survival of CPT -13 and reference IFX at weeks 26 and 52, and to determine the pharmacokinetic profiles and safety profile in real -world settings. Methods: A retrospective observational cohort analysis was conducted at a single center. The study compared the proportion of patients achieving clinical remission and experiencing poor clinical outcomes at weeks 26 and 52. The drug survival rate of CT -P13 and reference infliximab was also assessed during the follow-up period. Results: A total of 153 patients were included in the study, 39.2% receiving CPT -13 and 60.8% reference IFX. At week 26, clinical remission rates were 66.7% (CPT -13: 74.4% vs. reference IFX: 62.3%, p = 0.178), and at week 52, they were 64% (CPT -13: 85.4% vs. reference IFX: 63.0%, p = 0.012). Subgroup analysis with therapeutic drug monitoring (TDM) found no significant differences at week 26 (CPT -13: 74.4% vs. reference IFX: 58.8%, p = 0.235) or at week 52 (CPT -13: 85.4% vs. reference IFX: 68.8%, p = 0.153). Conclusion: Our study demonstrates comparable efficacy, drug survival, pharmacokinetic profiles, and incidence of immunogenicity between both drugs in a real clinical setting. Further studies with greater statistical power are needed to validate these findings. (c) 2023 Elsevier Espan a, S.L.U. All rights reserved.