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Background CT-P13 is the world’s first approved biosimilar infliximab for all indications of the reference infliximab. The purpose of this study was to assess long term safety and effectiveness of CT-P13 intravenous (IV) in patients with Crohn’s Disease (CD) and Ulcerative Colitis (UC). We now present the result of safety and effectiveness of CT-P13 in patient with CD, UC for up to 5 years from this longitudinal, observational, prospective cohort Phase IV study. Methods The study was conducted from 17 April 2014 to 28 February 2020 in 22 and 21 study centres, in Korea and European Union, respectively. Patients were administered 5 mg/kg of CT-P13 by IV at weeks 0, 2 and 6 and every 8 weeks thereafter. The primary objective was to evaluate adverse events of special interest (AESI) including HBV reactivation, congestive heart failure, opportunistic infections, serious infection including sepsis, tuberculosis, serum sickness (delayed hypersensitivity reactions), hematologic reactions, systemic lupus erythematosus/lupus like syndrome, demyelinating disorders, lymphoma, hepatobiliary events, hepatosplenic T cell lymphoma (HSTCL), intestinal or perianal abscess (in CD), serious infusion reactions during a re-induction regimen following disease flare, sarcoidosis/sarcoid-like reactions, paediatric malignancy, leukaemia, malignancy, colon carcinoma, dysplasia (in UC), skin cancer, pregnancy exposure and bowel stenosis, stricture and obstruction (in CD). Results A total of 470 patients with inflammatory bowel disease (IBD) were analysed. Overall 352 (74.9%) patients have been continuously treated for more than 1 year and the mean duration of drug exposure was 26.3 months. The safety profile of CT-P13 and switching from the reference infliximab to CT-P13 was well-tolerated. A total of 329 (70.0%) patients experienced at least one treatment-emergent adverse event (TEAE). Adverse events of special interest of CT-P13 were analysed by safety analysis set (Table 1). Immunogenicity testing was optional and 72 (15.3%) patients had at least one ADA positive after first infusion of study drug. The incidence of TEAEs in ADA positive subset (83.3%) were slightly higher compared to the incidence of TEAEs in ADA negative subset (76.6%). The effectiveness results of clinical remission for each indication was generally well maintained after the study drug administration (Table 2). Conclusion The results show that CT-P13 was well-tolerated and efficacious in IBD patients. There was no new safety and effectiveness findings in patients who have been exposed to CT-P13 or patients who have switched treatment from the reference infliximab to CT-P13.

journal of crohn's and colitis

P358 An observational, prospective cohort study to evaluate the long term safety and effectiveness of intravenous CT-P13 (biosimilar of infliximab) in patients with Crohn’s Disease or Ulcerative Colitis