EP25 Impact of sarilumab on unacceptable pain and inflammation control in moderately-to-severely active rheumatoid arthritis (RA) patients in 3 Phase 3 studies

Background In RA patients, unacceptable pain (UP) may persist despite inflammation control (refractory pain [RP]). Sarilumab is indicated (either with methotrexate or as monotherapy if methotrexate is not tolerated/appropriate) for adults with moderately-to-severely active RA with an inadequate response or intolerance to ≥ 1 conventional synthetic disease-modifying antirheumatics (csDMARD). The recommended dose is 200 mg every 2 weeks (q2w) with dose reduction to 150 mg if required for management of laboratory abnormalities. Three randomised controlled trials (RCTs) of subcutaneous sarilumab 150 or 200 mg q2w vs comparators showed meaningful improvements in pain. This analysis assessed UP and RP in these trials. Methods RCTs evaluated sarilumab 150 and 200 mg q2w vs placebo (+csDMARDs: MOBILITY/NCT01061736 and TARGET/NCT01709578) and sarilumab 200 mg q2w vs adalimumab 40 mg q2w (MONARCH/NCT02332590). Post-hoc analyses calculated odds ratios (ORs) of UP (based on patient acceptable symptom state on a threshold of visual analog scale pain >40 mm [0-100]), RP (UP+C-reactive protein Results Across all three trials, sarilumab 150 and 200 mg q2w had lower odds of UP (p < 0.05; ORs 0.39-0.46 vs placebo and 0.54 vs adalimumab). In MOBILITY, sarilumab 150 and 200 mg q2w had lower odds (p < 0.05) of RP vs placebo at Week 24 (ORs 0.60 [0.38,0.93] and 0.57 [0.37,0.87]) and Week 52 (ORs 0.64 [0.37,1.02] and 0.62 [0.37,1.02]), and RP-strict at Week 52 (0.41 [0.19,0.90] and 0.35 [0.16,0.76]). In TARGET, sarilumab 150 mg q2w had lower odds (p < 0.05) of RP-strict at Week 24. Higher pain was associated with worse FACIT-fatigue, HAQ, SJC and TJC scores (all p < 0.001). Conclusion Sarilumab was associated with lower odds of UP or RP vs adalimumab or placebo. Disclosures V. Bykerk: Consultancies; Abbvie, Amgen, Brainstorm Therapeutics, Bristol-Myers Squibb, Genentech, Gilead, Pfizer, Regeneron Pharmaceuticals, Inc., Sanofi, Scipher, Union Chimique Belge. Shareholder/stock ownership; Abbvie, Amgen, Brainstorm Therapeutics, Bristol-Myers Squibb, Genentech, Gilead, Pfizer, Regeneron Pharmaceuticals, Inc., Sanofi, Scipher, Union Chimique Belge. Grants/research support; AbbVie, Amgen, Brainstorm Therapeutics, Bristol-Myers Squibb, Genentech, Gilead, Pfizer, Regeneron Pharmaceuticals, Inc., Sanofi, Scipher, Union Chimique Belge. W. Wei: Shareholder/stock ownership; Regeneron Pharmaceuticals, Inc. Other; Regeneron Pharmaceuticals, Inc. S. Boklage: Shareholder/stock ownership; Regeneron Pharmaceuticals, Inc. Other; Regeneron Pharmaceuticals, Inc. T. Kimura: Shareholder/stock ownership; Regeneron Pharmaceuticals, Inc. Other; Regeneron Pharmaceuticals, Inc. S. Fiore: Shareholder/stock ownership; Sanofi. Other; Sanofi. G. St John: Shareholder/stock ownership; Regeneron Pharmaceuticals, Inc. Other; Regeneron Pharmaceuticals, Inc.