Objectives: This phase II, dose-ranging, double-blind, placebo-controlled, randomized study (NCT01463059) evaluated efficacy and safety of olokizumab (OKZ), a humanized anti-interleukin 6 monoclonal antibody, in Asian patients with moderately-to-severely active rheumatoid arthritis (RA) who had previously failed anti-TNF therapy.Methods: Patients were randomized to one of six treatment arms: placebo or OKZ (60 mg/120 mg/240 mg every four weeks [Q4W]; or 60 mg/120 mg every two weeks [Q2W]); stratified by country and number of prior anti-TNFs. Primary efficacy variable was Week 12 change from baseline (CFB) in DAS28 CRP for 4-week cumulative dose groups of OKZ and placebo; secondary efficacy variables were Week 12 ACR20/ACR50/ACR70 response rates. Patients continued MTX treatment from baseline, without additional csDMARDs.Results: Of 119 randomized patients, 88.2% completed the study. Greater improvements in DAS28(CRP) mean CFB at Week 12 were observed in all OKZ 4-week cumulative dose groups (60 mg/120 mg/240 mg) versus placebo (p < 0.0001). Week 12 ACR20/ACR50 response rates were higher in all OKZ cumulative dose groups versus PBO (p < 0.05). Incidences of adverse events were similar across OKZ 4-week cumulative dose groups (76.9-84.4%) and placebo (82.8%) with no deaths.Conclusions: OKZ demonstrated improvements in efficacy variables versus placebo in Asian patients with moderately-to-severely active RA who had previously failed anti-TNF therapy. The safety profile was as expected for this class of drug.
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