Study to Assess the Efficacy and Safety of Ublituximab in Participants With Relapsing Forms of Multiple Sclerosis (RMS) ( ULTIMATE 1 )

ARR is defined as the number of Independent Relapse Adjudication Panel (IRAP)-confirmed relapses per participant year. The estimate of ARR for a treatment group is the total number of relapses for participants in the respective treatment group divided by the sum of treatment duration for participants in that specific treatment group.

Time frame: Up to 96 weeks

Population: Modified Intention-to-Treat (mITT) population consisted of all participants in the ITT population who received at least one dose of study medication and have at least one baseline and post baseline efficacy assessment.

The SDMT involves a simple substitution task using a reference key, the examinee has 90 seconds to pair specific numbers with given geometric figures. Responses are done verbally. The administration time is approximately 5 minutes. The total SDMT score for each visit ranging from 0-110 is defined as the total number of correct answers reported in the case report form (CRF), where high scores indicate better outcome. Impaired SDMT is defined as a decrease from baseline of at least 4 points at any post-baseline assessment up to the Week 96 visit.

Time frame: Baseline up to Week 96

Population: mITT population consisted of all participants in the ITT population who received at least one dose of study medication and have at least one baseline and post baseline efficacy assessment.

A participant with NEDA is defined as a participant without relapses confirmed by the IRAP, without MRI activities (no T1 Gd+ lesions and no new/enlarging T2 lesions), and no 12-week CDP. Any evidence of disease activity from Week 24 to Week 96 was counted as not reaching NEDA. Any evidence of disease activity before Week 24 was not counted.

Time frame: Week 24 up to Week 96

Population: mITT population consisted of all participants in the ITT population who received at least one dose of study medication and have at least one baseline and post baseline efficacy assessment.

An adverse event (AE) is any unfavorable and unintended sign (including an abnormal laboratory finding, for example), symptom, or disease temporarily associated with the use of a medicinal product, whether or not considered related to the medicinal product. A Serious AE is defined as any untoward medical occurrence that: results in death, is immediately life-threatening, requires in-patient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, and/or causes a congenital anomaly/birth defect. A TEAE is an AE that starts or worsens after receiving study drug.

Time frame: From the first dose of study drug through the end of the study (up to approximately 116 weeks)

Population: Safety population included all participants who received at least one dose of study drug (ublituximab or teriflunomide, with corresponding placebos).

Time frame: Baseline up to Week 96

Population: mITT- MRI population included participants in mITT population who have baseline and post-baseline MRI efficacy assessments. Overall number of participants analyzed signifies participants who were evaluable for this outcome measure.

12-week CDP is defined as an increase in EDSS at least 1 point higher than the baseline EDSS if the baseline EDSS is ≤5.5 or at least 0.5 higher than the baseline EDSS if the baseline EDSS is \>5.5. The EDSS is based on a standard neurological examination, (pyramidal, cerebellar, brainstem, sensory, bowel and bladder, visual, and cerebral) and ambulation function system assessments. The EDSS disability scale ranges in 0.5-point steps from 0 (normal) to 10 (death) where higher scores indicate disability. The time to onset of 12-week CDP is the time to progression to the EDSS change defined above.

Time frame: Up to Week 96

Population: mITT population consisted of all participants in the ITT population who received at least one dose of study medication and have at least one baseline and post baseline efficacy assessment. As per protocol, data was summarized for the mITT Population using pooled data from participants in this study and TG1101-RMS302 \[NCT03277248\].

The total number of Gd-enhancing T1-lesions were calculated as the sum of the individual number of lesions at Weeks 12, 24, 48, and 96, divided by the total number of MRI scans of the brain.

Time frame: Weeks 12, 24, 48, and 96

Population: mITT- magnetic resonance imaging (MRI) population included participants in mITT population who have baseline and post-baseline MRI efficacy assessments. Overall number of participants analyzed signifies participants who were evaluable for this outcome measure.

The total number of NELs were calculated as the sum of the individual number of lesions at Weeks 24, 48, and 96, divided by the total number of MRI scans of the brain.

Time frame: Weeks 24, 48, and 96

Population: mITT- MRI population included participants in mITT population who have baseline and post-baseline MRI efficacy assessments. Overall number of participants analyzed signifies participants who were evaluable for this outcome measure.