A Phase IIIB Multicenter, Randomized, Double-Blind, Controlled Study to Evaluate the Efficacy, Safety and Pharmacokinetics of a Higher Dose of Ocrelizumab in Adults with Primary Progressive Multiple Sclerosis

Primary Progressive Multiple Sclerosis (PPMS)

1. Time to onset of cCDP sustained for at least 12 weeks. Time to onset of cCDP is defined as the first occurrence of a predefined confirmed progression event measured by EDSS, T25FWT or 9-HPT

1. Time to onset of 24 week cCDP (cCDP24), 2. Time to onset of cCDP12 independent of protocol-defined relapses (PDR), also termed progression independent of relapse activity (PIRA) as per Kappos et al.2020, 3. Time to onset of 12-week CDP (CDP12), 4. Time to ≥ 20% increase in 12 week confirmed T25FWT, 5. Annual rate of percent change from baseline in total brain volume, 6. Annual rate of percent change from baseline in thalamic volume, 7. Time to 12-week confirmed 4-point worsening in Symbol Digit Modalities Test (SDMT), 8. Change in NfL (i.e. ratio to baseline) at Week 96, 9.Time to 12-week confirmed 8-point increase in 12-Item Multiple Sclerosis Walking Scale (MSWS12), 10. Change in NfL (i.e. ratio to baseline) at Week 96 for patients in the higher dose ocrelizumab group, 11. Change in NfL (i.e. ratio to baseline) at Week 96 for patients in the approved dose ocrelizumab group, 12. Incidence and severity of adverse events, with severity determined according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) Version 5.0, 13. Change from baseline in clinical laboratory test results (including hematology, chemistry, and Ig levels), 14. Change from baseline in vital signs (including systolic and diastolic blood pressure, and pulse rate) following study treatment administration, 15. Serum concentration of ocrelizumab at specified timepoints, 16. B-cell levels in blood (including comparing the degree of B-cell depletion between the doses), 17. Proportion of participants achieving 5 or less B-cells per microliter of blood, 18. Proportion of participants achieving 5 or less B-cells per microliter of blood in participants with the high versus low affinity Fcgamma Receptor 3A (FcγR3A) genotype per arm, 19. Change from Baseline in the anti-drug antibodies (ADAs) levels, 20. Levels of Neurofilament Light Chain (NfL) in blood, 21. Levels of Interleukin-6 (IL-6) in blood, 22. Levels of blood B-cells, 23. Levels of Lymphocytes in blood, 24. Proportion of participants with different DNA genotypes

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