Mucosal Healing Study in Crohn's Disease (CD)

Certolizumab pegol (CDP870) 400 mg administered subcutaneously (sc) at Weeks 0, 2 and 4 (induction doses), then every 4 weeks (Q4W) until Week 52. Investigators can escalate dosage to CDP870 400 mg 2-weekly (Q2W) at any time after Week 10 for lack of response/remission. After Week 52 patients can continue to receive treatment until study drug end, either Q4W or Q2W, according to their administration frequency at Week 52.