Refer to adverse events for complete listing of serious adverse events and other adverse events. Adverse events of interest were presented in separate tables. There were no reports of macular edema.

Number of patients with abnormal ECG conduction findings during dose-blinded titration at any visit post-dose, by type of abnormality and treatment (Extension Set). Number analyzed represent participants who had ECG results. Washout was defined as not being on treatment drug between Core and Extension for >7 days. Abbreviation: Con=conduction, IVCD=intraventricular conduction defect , WPW=Wolff-Parkinson-White syndrome

Number of patients with abnormal ECG conduction findings during dose-blinded titration at any visit post-dose, by type of abnormality and treatment (Extension Set). Number analyzed represent participants who had ECG results. Washout was defined as not being on treatment drug between Core and Extension for >7 days. Abbreviations: washout = WO, Con=conduction

Sitting blood pressure was measured in triplicate. The categories of notably low and high values and changes are presented for systolic (SBP) and diastolic (DBP). Multiple occurrences for a patient are counted as one occurrence in this table.

Most infections were clinical diagnoses and were not confirmed by microbiology / virologic investigations. A patient with multiple occurrences of an infection for a preferred term is counted only once in each specific category.

Events identified as infections by the Investigator and defined as an AE with onset on or after the first dose of Extension Study drug up to and including 30 days after the date of the last dose

Group level ARR (raw) is calculated as the total number of relapses for all the patients in the treatment group divided by the total number of days on study for all patients in the group and multiplied by 365.25 to obtain the annual rate.

Model estimates are based on a negative binomial regression model, adjusted for treatment group, age, baseline EDSS, baseline number of Gd-enhanced T1 lesions and number of relapses in previous 2 years as covariates, with log(time on study in years) as the offset variable, using the log link.

Free of MRI disease activity is defined as free of Gadolinium enhanced T1 lesions at any scan; free of new or enlarging T2 lesions at any scan: free of both gadolinium enhanced T1 lesions and new or enlarging T2 lesions at any scan. Number of patients analyzed = patients with at least one MRI scan during the specified time period. New lesions at a specific visit are assessed relative to the previous scheduled visit scan.

No imputation of missing scans is performed. As a result missing scans can lead to an overestimation of the proportion of patients free of a specific MRI activity.

Six-month disability progression was defined relative to extension baseline EDSS score: 1.5 point increase in patients with baseline EDSS score of 0, 1.0 increase in patients with baseline EDSS score of between 0.5 to 5.0, inclusive and 0.5 increase in patients with baseline EDSS score of ≥ 5.5. The criteria for 6-month disability progression included detection of onset of progression and confirmation of progression for a period of at least 6 months.