This is a multicenter, Phase 3, double-blind, placebo-controlled study evaluating the efficacy, safety, and tolerability of etrolizumab compared with placebo during induction and maintenance treatment of moderate to severely active CD in participants who are refractory or intolerant to corticosteroids (CS), immunosuppressants (IS), or anti-tumor necrosis factors (anti-TNFs) or have inadequate response to anti-tumor necrosis factor (TNF-IR). Participants who enroll on the basis of refractory or intolerance to CS and/or IS may have been previously exposed to anti-TNFs or be naïve to anti-TNFs. The study period will consist of Screening Phase (up to 35 days) plus (+) 14-week Induction Phase + 52-week Maintenance Phase + 12-week Safety Follow-up Phase. At Week 14 (end of Induction Phase), participants achieving decrease of 70 points in Crohn's Disease Activity Index (CDAI) from baseline (CDAI-70 response) without the use of rescue therapy will continue to the Maintenance Phase.
A Phase III, Randomized, Double-Blind, Placebo-Controlled, Multicenter Study to Evaluate the Efficacy and Safety of Etrolizumab as an Induction And Maintenance Treatment For Patients With Moderately to Severely Active Crohn's Disease