This study consists of three periods, Screening (up to 30 days), Treatment (12 months) and Post-treatment follow-up (6 months). It is an open-label single-arm study so all participants will receive the study drug. The first dose will be administered in the clinic and the remaining doses may be administered at home. The doses are administered at Baseline/Week 0, Week 1, Week 2, and followed by subsequent monthly dosing starting at Week 4.~Participants will be required to come into the clinic for one screening visit, and 5 visits during the Treatment period for clinical evaluation and lab tests. Participants who complete the 12-month treatment will have Post treatment Follow-Up visits at End of Study plus 3 months (EOS + 3M) and EOS + 6M, unless the participants decide to continue with commercially available ofatumumab treatment outside of the study.
The purpose of this study is to evaluate the efficacy and safety of ofatumumab s.c. in adult participants with relapsing multiple sclerosis (RMS) in China.