A Study to Provide Complementary Efficacy, Safety and Patient Reported Outcomes Data in Participants With Active Relapsing Forms of Multiple Sclerosis (MS) in a Pragmatic Setting

Inclusion criteria

• Age >/=18 years at screening
• Patients with relapsing forms of multiple sclerosis (RMS) with active disease defined by clinical or imaging features: (i) at least one clinical relapse over a 6-month period prior to screening; (ii) AND/OR at least one T1 gadolinium-enhancing lesion or new and/or enlarging T2 lesion as detected by brain Magnetic Resonance Imaging (MRI) performed over a 3 months period prior to screening with no change of Disease-Modifying Treatment(s) (DMT) compared to a previous MRI performed within 24 months before screening
• For women of childbearing potential: agreement to use an acceptable birth control method during the treatment period and for at least 12 months after the last dose of ocrelizumab
• Participants should be beneficiary of healthcare coverage under the social security system

Exclusion criteria

• Diagnosis of primary progressive MS
• Inability to complete an MRI (contraindications for MRI include but are not restricted to weight ≥140 kg, pacemaker, cochlear implants, presence of foreign substances in the eye, intracranial vascular clips, surgery within 6 weeks of entry into the study, coronary stent implanted within 8 weeks prior to the time of the intended MRI, etc…)
• Gadolinium intolerance
• History of ischemic cerebrovascular disorders (e.g., stroke, transient ischemic attack) or ischemia of the spinal cord
• History or known presence of central nervous system (CNS) or spinal cord tumor (e.g., meningioma, glioma)
• History or known presence of potential metabolic causes of myelopathy (e.g., untreated vitamin B12 deficiency)
• History or known presence of infectious causes of myelopathy (e.g., syphilis, Lyme disease, human T-lymphotropic virus 1 (HTLV-1), herpes zoster myelopathy)
• History of genetically inherited progressive CNS degenerative disorder (e.g., hereditary paraparesis; MELAS [mitochondrial myopathy, encephalopathy, lactic acidosis, stroke] syndrome)
• Neuromyelitis optica
• History or known presence of systemic autoimmune disorders potentially causing progressive neurologic disease (e.g., lupus, anti-phospholipid antibody syndrome, Sjogren's syndrome, Behçet's disease, sarcoidosis)
• History of severe, clinically significant brain or spinal cord trauma (e.g., cerebral contusion, spinal cord compression)
• Vulnerable patients (Patient referred to in Articles L. 1121-5 to L. 1121-8 and L. 1122-1-2 of the French Public Health Code)