A Study of the Efficacy and Safety of BCD-281 in Patients With Relapsing-Remitting Multiple Sclerosis

Inclusion criteria

• Provided written ICF to participate in the study.
• Male and female subjects aged 18 to 55 years inclusive at the time of signing the ICF.
• Diagnosis of multiple sclerosis, established in accordance with the McDonald criteria for the diagnosis of multiple sclerosis (2017 revision).
• Relapsing-remitting multiple sclerosis.
• The total EDSS score 0-5.5 inclusive.
• Documentary evidence of the following at the time of signing the ICF:
• at least one relapse within the last12 months, and/or
• 2 relapses within the last 24 months, and/or
• at least 1 T1 Gd+ lesion detected on brain MRI and 1 relapse within 24 months prior to signing the ICF.
• Presence of IgG antibodies to the Varicella-Zoster virus.
• Neurological stability for 30 days prior to signing the ICF.
• Subject's willingness to discontinue previously prescribed DMTs from the day of the first administration of the IP and throughout the study.
• The ability of the subject to follow the Protocol procedures, according to the Investigator.
• Willingness of subjects of both sexes and their sexual partners of childbearing potential to use reliable methods of contraception from the time of signing ICF, throughout the study and for 5 months after the last dose of the drug in this study.

Exclusion criteria

• Primary progressive or secondary progressive MS.
• MS duration of more than 10 years with EDSS score of ≤2.0 at screening.
• Malignant form of MS.
• Other medical conditions that can affect the assessment of clinical picture of the MS.
• Inability to obtain high-quality MRI images and/or the presence of contraindications to MRI and the administration of gadolinium-containing contrast agents.
• Any comorbidities requiring treatment with systemic glucocorticoids and/or immunosuppressive drugs for the duration of the study, with the exception of MS.
• History of progressive multifocal leukoencephalopathy.
• Any acute or exacerbated chronic infections detected during screening that may have a negative impact on subject's safety during the study therapy.
• Concomitant diseases and/or conditions that may affect the assessment of the clinical picture of the underlying disease and/or significantly increase the risk of AEs during the study.
• Known alcohol or drug addiction, or current signs of alcohol/drug addiction.
• History of severe depression and/or a Beck Depression Inventory score of ≥16 at screening examination.
• History of a malignant disease within 5 years prior to screening.
• A diagnosis of HIV infection, hepatitis B or C .
• Inability to provide the subject with venous access.
• Pregnancy or breastfeeding, pregnancy planning and oocyte donation throughout the study and for 5 months after the last dose of ocrelizumab.
• A history of severe allergic or anaphylactic reactions to humanized and/or murine monoclonal antibodies.
• A history of using any prohibited medications or treatments defined in the study protocol.
• Abnormal laboratory blood values, as specified in the study protocol.