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CompletedNCT00276172Updated Jun 22, 2009

Open-Label Natalizumab Safety Extension Study

A Phase 3 interventional study of Natalizumab in Multiple Sclerosis, sponsored by Biogen. Completed at 1 site in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2009-06-22.

Sponsored by Biogen · Phase 3, Interventional, and Treatment

Phase
Phase 3
Study type
Interventional
Enrollment
1,615
Allocation
Non-randomized
Ages
18 Years and older
Sex
All
01

Study summary

The primary objective of this study is to determine the safety and the immunogenicity of extended treatment with natalizumab when administered at a dose of 300 mg intravenously (IV) to subjects with multiple sclerosis (MS) who have completed natalizumab Studies C-1801, C-1802, or C-1803.

02

Conditions studied

  • Multiple Sclerosis
03

In context

Multiple Sclerosis

3,460 studies on the registry are indexed under Multiple Sclerosis; 661 are open to participants now.

This study's enrollment of 1,615 is above the median of 50 across 2,342 interventional studies indexed under Multiple Sclerosis.

Browse Multiple Sclerosis studies →

Lead sponsor

Biogen is the lead sponsor of 494 studies on the registry; 22 are open to participants now.

Of its 98 completed or terminated interventional studies of FDA-regulated products, 49 (50%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Must give written informed consent.
  • Must be an MS subject who has completed natalizumab Study C-1801, C-1802 or C-1803

Exclusion criteria

Exclusion Criteria:

  • History of, or available abnormal laboratory results, indicative of any significant disease that would preclude treatment.
  • History of severe allergic or anaphylactic reactions or known drug hypersensitivity
  • A clinically significant infectious illness within 30 days prior to study entry.
05

Study design

Phase
Phase 3
Primary purpose
Treatment
Allocation
Non-randomized
Intervention model
Single group
Masking
None (open label)
Enrollment
1,615 participants (actual)

Study arms

  • Experimental
    Natalizumab

    Open-label natalizumab

    Drug: Natalizumab

Interventions

  • DrugNatalizumab

    Natalizumab 300 mg by IV infusion, every 4 weeks, for up to 24 months

    Also known as: Tysabri

06

What researchers measure

Primary outcomes

  1. The safety endpoints under consideration will be the incidence of adverse events, changes in laboratory evaluations, vital signs, and physical examinations. The incidence of development of antibodies to natalizumab will also be assessed.

    Time frame: Month 24

Secondary outcomes

  1. EDSS scores and assessments of relapse.

    Time frame: Month 24

07

Study locations

1 site
  • Performed at only C-1801, C-1802, and C-1803 sites globally. No general public enrollment. Biogen Idec is located in
    Cambridge, Massachusetts 02142, United States
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jun 22, 2009, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT00276172
Lead sponsor
Biogen
First posted
Jan 13, 2006
Start date
Dec 2003
Primary completion
Oct 2005
Completion
Jan 2006
Last update
Jun 22, 2009

Study contacts

Michael Panzara, MD, MPH
study director · Biogen
Paul O'Connor, MD
principal investigator · Unity Health Toronto
Eve Versage
study chair · Biogen Idec. Contact for more details

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Jun 2009. You cannot join it, but the record below documents what was studied.

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