Effectiveness and safety of biosimilar etanercept GP2015 in patients with rheumatoid arthritis in the UK: results from the COMPACT study

Background/Aims COMPACT is a non-interventional, multinational cohort study to evaluate effectiveness, safety and quality of life (QoL) outcomes in patients with rheumatic diseases treated with GP2015, an approved etanercept (ETN) biosimilar, under real-world conditions. Here, we present data from patients in the UK with rheumatoid arthritis (RA) enrolled in the COMPACT study, focusing on those who switched to GP2015 from reference ETN or another biosimilar ETN. Methods The COMPACT study included patients (>= 18 years of age) with rheumatic diseases treated with GP2015. This analysis includes patients from the UK diagnosed with RA who were in treatment Group A (patients in clinical remission or low disease activity under treatment with reference ETN or other biosimilar ETN, who switched to GP2015 prior to study enrolment). Effectiveness and QoL outcomes were assessed using Disease Activity Score 28-joint count (DAS28) and health assessment questionnaire-disability index (HAQ-DI), respectively, and are presented up to Week 24. Safety outcomes were assessed, including rates of adverse events (AEs) and serious AEs (SAEs). Results A total of 112 patients with RA who switched to GP2015 from reference ETN or another biosimilar ETN (Group A) were enrolled in the UK. The mean standard deviation (SD) age was 62.9 11.3 years and 74.1% of patients were female. The mean SD DAS28 score remained unchanged from baseline (2.6 +/- 1.3) to Week 24 (2.5 +/- 1.6). The mean +/- SD HAQ-DI score displayed no major difference between baseline (1.2 +/- 0.8) and Week 24 (0.9 +/- 0.8). Overall, 67.9% (n=76) of patients experienced >= 1 AE and 9.8% (n=11) of patients experienced >= 1 SAE (Table). Conclusion Over 24 weeks of treatment with GP2015, disease activity remained low and stable in patients with RA previously switched from reference ETN or from another biosimilar ETN, with no new safety concerns observed. These results from a cohort of patients with RA treated in the UK are consistent with effectiveness, QoL and safety data reported previously for the total population in the COMPACT study. Disclosure A. Askari: None. C. Both: None. A. Martin: None. D.A. Walsh: Consultancies; Consultancy fees paid to University of Nottingham: Contura International A/S, Glaxo SmithKline, AKL Research and Development Ltd, Consultancy fees paid to University of Nottingham: Pfizer Ltd, Abbvie Ltd, Ely Lilly & Co.Ltd, Galapagos Ltd., Reckitt Benckiser Health Ltd. Honoraria; Speaker fees paid to David Walsh: Irish Society of Rheumatology, Speaker fees paid to University of Nottingham: Medscape International, Pfizer Ltd, Abbvie Ltd. Grants/research support; Grants paid to University of Nottingham: Versus Arthritis, UKRI, NIHR, Nuffield Foundation, Pfizer Ltd, Ely Lilly & Co Ltd, UCB Pharma, Grants paid to University of Nottingham: GlaxoSmithKline Research and Development, Orion Corporation. T. Sheeran: None.