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• W2953306569 abstract "Background Filgotinib (FIL), an oral selective JAK1 inhibitor, was safe and efficacious in FINCH2, a randomized, double-blind, placebo-controlled, phase 3 study in patients with active rheumatoid arthritis (RA) who had an inadequate response to biologic disease-modifying anti-rheumatic drugs (bDMARDs).1 The whole blood transcriptional profile of patients was evaluated. Objectives Identify RA-associated gene transcripts and biological pathways that are altered in response to FIL treatment and interrogate FIL-modulated biomarkers correlated with disease activity. Methods RA patients enrolled in FINCH2 (n=449) were randomized 1:1:1 and received FIL (100 mg, 200 mg) or placebo (PBO) once daily plus a stable background dose of methotrexate. Whole blood samples from enrolled patients were collected at baseline (BL) and weeks 4 and 12 for RNA sequencing. Spearman’s rank correlation of BL disease activity (DAS28[CRP]) was calculated to define disease-associated genes (DAGs) and pathways (DAPs). Differential expression of 5155 genes and FIL-specific changes were determined after subtracting gene expression changes in the PBO group. Biological pathways (910 total) were analyzed by Gene Set Enrichment Analysis (GSEA) or single-sample GSEA. A false-discovery rate of 5% was applied for all analyses. Results At weeks 4 and 12, more genes were significantly differentially expressed in the FIL 200 mg arm vs the 100 mg arm; and, consistent with increased clinical efficacy, the average magnitude of change in gene expression was larger. No single gene reached a threshold of significance for differential expression in PBO-treated patients. FIL treatment induced a stronger reversal of DAG expression (rho range: –0.35 to –0.59) compared to PBO (rho ∼ –0.3) at weeks 4 and 12. DAGs most prominently reversed by FIL included FAM20A and METTL7B. Top-ranked pathways associated positively with disease activity at BL included inflammatory response, complement activity, and cell cycle. Hallmark pathways most significantly reduced following FIL treatment included IL-6/JAK/STAT, inflammatory, and interferon response, consistent with observed effects of FIL in preclinical models and phase 2 DARWIN studies. In contrast, IL-6/JAK/STAT signaling increased at weeks 4 and 12 with PBO. DAPs showed a similar reversal of gene expression (rho range: –0.43 to –0.58) with FIL at weeks 4 and 12 compared to PBO (rho range: –0.007 to –0.024) suggesting that FIL treatment may attenuate RA-mediated IL-6/JAK/STAT signaling, inflammation, and other RA-associated pathways correlated with clinical outcome measures. Conclusion The whole blood transcriptional profile of patients following FIL treatment showed a dose-dependent reduction in the expression of JAK/STAT signaling and inflammation genes. No significant changes in the expression of DAGs were observed in PBO-treated patients. FIL also broadly reversed DAGs and DAPs, and ongoing research is exploring the relationship between changes in gene and pathway modulation across a range of clinical endpoints. Reference [1] Genovese MC, et al. ACR 2018. Abstract L06. Disclosure of Interests Peter C. Taylor Grant/research support from: Celgene, Galapagos, Eli Lilly, UCB, Consultant for: AbbVie, Galapagos, Gilead, Eli Lilly, Pfizer Inc, Bryan Downie Shareholder of: Gilead Sciences, Inc., Employee of: Gilead Sciences, Inc., Luting Zhuo Shareholder of: Gilead Sciences, Inc., Employee of: Gilead Sciences, Inc., Rachael E. Hawtin Shareholder of: Gilead, Employee of: Gilead, Jinfeng Liu Shareholder of: Gilead Sciences, Inc., Roche, Employee of: Gilead Sciences, Inc., Amer M. Mirza Shareholder of: Gilead Sciences, Inc., Employee of: Gilead Sciences, Inc." @default.
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• W2953306569 date "2019-06-01" @default.
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• W2953306569 title "THU0194 SELECTIVE INHIBITION OF JANUS KINASE 1 (JAK1) BY FILGOTINIB MODULATES THE DISEASE-ASSOCIATED WHOLE BLOOD TRANSCRIPTIONAL PROFILE OF PATIENTS WITH ACTIVE RHEUMATOID ARTHRITIS" @default.
• W2953306569 doi "https://doi.org/10.1136/annrheumdis-2019-eular.2509" @default.
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