Extended interval dosing with ocrelizumab in multiple sclerosis

Frederik Novak*, Hamza Mahmood Bajwa, Kamilla Østergaard, Jonas Munksgaard Berg, Jonna Skov Madsen, Dorte Aalund Olsen, Inga Urbonaviciute, Zsolt Illes, Morten Leif Stilund, Jeppe Romme Christensen, Stephan Bramow, Finn Sellebjerg, Tobias Sejbaek

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review


Background: This study investigates clinical and biomarker differences between standard interval dosing (SID) and extended interval dosing (EID) of ocrelizumab therapy in multiple sclerosis (MS). Methods: This is a prospective, double-arm, open-label, multi-center study in Denmark. Participants diagnosed with MS on ocrelizumab therapy >12 months were included (n = 184). Clinical, radiological, and blood-based biomarker outcomes were evaluated. MRI disease activity, relapses, worsening of neurostatus, and No Evidence of Disease Activity-3 (NEDA-3) were used as a combined endpoint. Results: Out of 184 participants, 107 participants received EID (58.2%), whereas 77 participants received SID (41.8%). The average extension was 9 weeks with a maximum of 78 weeks. When comparing EID to SID, we found higher levels of B-cells, lower serum concentrations of ocrelizumab, and similar levels of age-adjusted NFL and GFAP in the two groups. No difference in NEDA-3 between EID and SID was demonstrated (hazard ratio: 1.174, p = 0.69). Higher levels of NFL were identified in participants with disease activity. Body mass index correlated with levels of ocrelizumab and B-cells. Conclusion: Extending one treatment interval of ocrelizumab on average 9 weeks and up to 78 weeks did not result in clinical, radiological, or biomarker evidence of worsening compared with SID.

Original languageEnglish
JournalMultiple Sclerosis Journal
Pages (from-to)847-856
Number of pages10
Publication statusPublished - Jun 2024


  • anti-CD20
  • biomarkers
  • extended dosing
  • Multiple sclerosis
  • NEDA-3
  • neuroimaging
  • ocrelizumab
  • personalized medicine
  • treatment interval


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