P210 Efficacy and safety of filgotinib for patients with RA with inadequate response to methotrexate: FINCH1 primary outcome results

Abstract

Background: Filgotinib (FIL) is an oral, potent, selective Janus kinase 1 inhibitor that has shown good efficacy and was well tolerated for treatment of rheumatoid arthritis (RA). The objective of this study was to evaluate efficacy and safety of FIL treatment in patients with RA who have had an inadequate response to methotrexate (MTX). Method(s): This Phase 3, double-blind, active-and placebo (PBO)-controlled study randomised patients with active RA (3:3:2:3) to FIL 200mg, FIL 100mg, adalimumab [ADA] 40mg every 2 weeks, or PBO daily for up to 52 weeks; results through week 24 are presented. Patients also received background MTX. Primary efficacy endpoint was proportion of patients achieving ACR20 at week 12; additional clinical assessments included ACR50 and ACR70 and DAS28-CRP score <2.6, and patient-reported outcomes including HAQDI. Safety endpoints included adverse event types and rates. Logistic regression was used for superiority test of FIL vs PBO for ACR response and other binary endpoints, while mixed-effect model for repeated measures (MMRM) were used for continuous endpoints. Non-inferiority test of FIL to ADA (preserving >50% of ADA response) was performed for DAS28-CRP <2.6. Result(s): Of 1,759 patients randomised, 1,755 received study drug: 475 FIL 200mg; 480 FIL 100mg; 325 ADA; and 475 PBO, of which 89.5%, 90.4%, 88.9%, and 81.3%, respectively, completed 24 weeks of study drug. 81.8% were female, mean (standard deviation [SD]) duration of RA was 7.8 (7.6) years, and mean (SD) DAS28-CRP was 5.7 (0.9). At week 12, significantly more patients in the FIL 200mg and 100mg arms achieved an ACR20 improvement vs PBO (Table 1). More patients receiving FIL achieved ACR50 and ACR70 improvements, DAS28-CRP scores <2.6 and reported improvements in HAQ-DI scores versus PBO (Table 1). Non-inferiority of FIL 200mg to ADA was met based on DAS28-CRP <=3.2.