P434 The PROPER study: interim analysis of a Pan-European real-world study of SB5 adalimumab biosimilar after transition from reference adalimumab in patients with Crohn’s disease
Dignass, A.U.(1);Gisbert, J.P.(2);Bossa, F.(3);Freudensprung, U.(4);Addison, J.(5);
(1)Agaplesion Markus Hospital- Goethe University, Department of Medicine, Frankfurt, Germany;(2)Hospital Universitario de La Princesa- Instituto de Investigación Sanitaria Princesa IIS-IP- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas CIBEREHD- Universidad Autónoma de Madrid, Gastroenterology Unit, Madrid, Spain;(3)Fondazione Casa Sollievo della Sofferenza – IRCCS - San Giovanni Rotondo, Division of Gastroenterology, Puglia, Italy;(4)Biogen International GmbH, Global Head of Medical Data Science and Analytics MDSA Biosimilars, Baar, Switzerland;(5)Biogen Biosimilars Unit, Medical, Baar, Switzerland;
Background
SB5, a biosimilar to reference adalimumab (ADL), received EU marketing authorisation in August 2017, based on pre-clinical and clinical phase I and III studies that demonstrated bioequivalence and comparable efficacy, safety and immunogenicity profiles to ADL. The real-world study ‘PROPER’ is designed to provide insights into outcomes of the transition from reference to SB5 outside the controlled, randomised, clinical trial setting. Under an umbrella design, 1000 patients with immune-mediated inflammatory disease have been enrolled at centres in Belgium, Germany, Ireland, Italy, Spain and the UK.
Methods
Eligible patients had been transitioned to SB5 as part of routine treatment following a minimum of 16 weeks’ treatment with ADL. Data were captured from patient charts retrospectively for 24 weeks prior to and prospectively and/or retrospectively for 48 weeks after SB5 initiation. This interim analysis of the Crohn’s disease cohort reports outcome measures including clinical characteristics, disease activity, persistence on SB5, clinical management and safety for patients enrolled at 32 specialist sites and followed up to the data extract date of October 5th, 2021.
Results
Of the 462 patients included in this interim analysis, the majority were enrolled in Germany (n=127), Spain (n=118) and Italy (n=79); Belgium, Ireland and UK enrolled 56, 46 and 36 patients, respectively. At time of data extract, 416 patients had completed 48 weeks of follow-up and 15 had withdrawn from the study.
The most common reasons driving transition were physician decision, or a mandate from the health authority or payer. At baseline, the majority of patients were in remission or had mild disease as determined by Harvey Bradshaw Index (HBI), and were in remission or stable according to physician opinion. Most patients transitioned to the same SB5 regimen as they had received for ADL (Table 1).
Twenty-four patients reported 27 serious adverse events (SAE), of which 4 (anal fistula [n=1], perianal abscesses [n=2] and subileus [n=1]) were considered by the study physician to be related to SB5 administration.
Conclusion
No meaningful change in HBI or SB5 dosing regimen was observed from baseline to Week 48 after transition from ADL. The number of patients experiencing a treatment-related SAE was low, and no new safety concerns were detected. Thus, transition from ADL to SB5 was generally safe and effective in patients with Crohn’s disease over 48 weeks of follow-up.
Acknowledgements:
This study was funded by Biogen International GmbH. Statistical services were provided by FGK Clinical Research GmbH, Munich, Germany. Data management services were provided by Worldwide Clinical trial, Research Triangle Park, NC, USA.