Reduced Oligodendrocyte-specific Cytotoxicity and Ofatumumab Treatment

This investigator-initiated study will be carried out secondary to the discussion of treatment with Ofatumumab and thus our study will not influence or impact the determination of the suitability for candidates to commence therapy with Ofatumumab. This decision will be made by the patient's physician as part of the patient's standard care, and will occur independently of this study. Patients to be enrolled in this longitudinal study will only be asked if they would like to take part if their clinician independently chooses Ofatumumab as a treatment option.