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Related Experiment Video

Updated: Jan 30, 2026

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Natalizumab plus interferon beta-1a for relapsing multiple sclerosis.

Richard A Rudick1, William H Stuart, Peter A Calabresi

  • 1Mellen Center for Multiple Sclerosis Treatment and Research, Cleveland Clinic Foundation, Cleveland, OH 44195, USA. rudickr@ccf.org

The New England Journal of Medicine
|March 3, 2006
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Summary
This summary is machine-generated.

Adding natalizumab to interferon beta-1a significantly reduced disability progression and relapses in multiple sclerosis patients. This combination therapy offers improved outcomes compared to interferon beta-1a alone.

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Area of Science:

  • Neuroimmunology
  • Clinical Neurology
  • Pharmacology

Background:

  • Interferon beta is a standard treatment for relapsing multiple sclerosis (MS).
  • Many patients on interferon beta experience continued disease activity, including relapses.
  • Natalizumab, an alpha4 integrin antagonist, showed promise in preliminary studies for MS treatment.

Purpose of the Study:

  • To evaluate the efficacy and safety of adding natalizumab to interferon beta-1a in patients with active relapsing MS.
  • To compare the combination therapy against interferon beta-1a monotherapy.

Main Methods:

  • A randomized trial involving 1171 patients with relapsing MS despite interferon beta-1a therapy.
  • Patients received either interferon beta-1a plus natalizumab or interferon beta-1a plus placebo every 4 weeks.
  • Primary endpoints included the rate of clinical relapse at 1 year and 12-week sustained disability progression at 2 years.

Main Results:

  • Combination therapy reduced the risk of sustained disability progression by 24% (P=0.02).
  • The annualized relapse rate was significantly lower with combination therapy (0.34 vs. 0.75, P<0.001).
  • Fewer new or enlarging MRI lesions were observed in the combination group (0.9 vs. 5.4, P<0.001).

Conclusions:

  • Natalizumab added to interferon beta-1a is more effective than interferon beta-1a alone for relapsing MS.
  • The combination therapy demonstrated significant benefits in reducing relapses and disability progression.
  • Further research is necessary to fully understand the benefits and risks of this combination treatment.