Overview ACT-128800 in Patients With Moderate to Severe Chronic Plaque Psoriasis Status: Completed Trial end date: 2012-11-01 Target enrollment: Participant gender: Summary This study will assess the efficacy, safety and tolerability of two doses of ACT 128800 in patients with moderate-to-severe chronic plaque psoriasis. Phase: Phase 2 Details Lead Sponsor: ActelionTreatments: Ponesimod