Behçet's disease, is a rare disorder that causes inflammation in blood vessels throughout the body. The signs and symptoms of Behçet's disease may include mouth sores, eye inflammation, skin rashes and lesions, and genital sores that vary from person to person and may come and go on their own. The exact cause of Behçet's is unknown, but it may be an autoimmune disorder, which means the body's immune system mistakenly attacks some of its own healthy cells.~This study will evaluate if apremilast is better than placebo (inactive substance in the same form as the drug) for the treatment of oral ulcers in subjects with active Behçet's disease. Other manifestations of the disease will also be assessed, such as, pain and tenderness in joints, eye inflammation, genital ulcers, and skin disease. This study also will test how well the body tolerates apremilast. In addition, the second purpose of the study is to assess the safety of apremilast in patients with Behçet's disease.~This study is a randomized, placebo-controlled, parallel design. The placebo-controlled period will be 12 weeks long and participants will receive apremilast or placebo. After the 12-week placebo-controlled period, all participants will receive apremilast for 52 weeks in the active treatment period. All participants will have their final study visit 4 weeks after stopping apremilast treatment.~Participants in Germany will have the opportunity to enter an optional open-label extension phase after the 52-week active treatment phase (week 64 visit), and continue until apremilast is commercially available for Behçet's disease or until apremilast is found not to be acceptable for Behçet's disease, according to either the sponsor or health authority.
The main objective of this study is to evaluate the efficacy and safety of apremilast in the treatment of oral ulcers in adults with active Behçet's disease (BD).