Clinical Study to Evaluate the Efficacy, Safety, and Tolerability of ACT-128800 in Patients With Relapsing-remitting Multiple Sclerosis

Annualized Confirmed Relapse Rate

Relapse: occurrence of acute episode of one or more new symptoms or worsened symptoms of Multiple Sclerosis (MS), not associated with fever/infection and lasting 24 hours after stable 30 days period. Confirmed relapse: increase from baseline at least 0.5 point Expanded Disability Status Scale (EDSS) score or increase of one point in one, two or three Functional Systems (FS), excluding bowel/bladder and cerebral/mental FS. EDSS and FS scores are based on neurological examination for assessing its impairment in MS. Among eight FS, seven are ordinal clinical rating scales ranging from 0-5 or 6 with higher scale indicating overall functional impairment assessing Visual, Brain Stem, Pyramidal, Cerebellar, Sensory, Bowel/Bladder and Cerebral functions. Rating individual FS scores is used to rate EDSS with information concerning gait and use of assistance. EDSS is ordinal clinical scale ranges 0 (normal neurological examination) to 10(death due to MS)

Time frame: Up to 24 weeks

Number of Participants With First Confirmed Relapse as Assessed by Kaplan-Meier Estimate From Baseline to Week 24

Relapse: occurrence of acute episode of one or more new symptoms or worsened symptoms of MS, not associated with fever/infection and lasting 24 hours after stable 30 days period. Confirmed relapse: increase from baseline at least 0.5 point Expanded Disability Status Scale (EDSS) score or increase of one point in one, two or three Functional Systems (FS), excluding bowel/bladder and cerebral/mental FS. EDSS and FS scores are based on neurological examination for assessing its impairment in MS. Among eight FS, seven are ordinal clinical rating scales ranging from 0-5 or 6 with higher scale indicating overall functional impairment assessing Visual, Brain Stem, Pyramidal, Cerebellar, Sensory, Bowel/Bladder and Cerebral functions. Rating individual FS scores is used to rate EDSS with information concerning gait and use of assistance. EDSS is ordinal clinical scale ranges 0 (normal neurological examination) to 10(death due to MS). Kaplan-Meier estimate used for Outcome Measure analysis.