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Marketing Authorisation Application for Natalizumab Submitted to European Medicines Agency for Approval

CAMBRIDGE, Mass., SAN DIEGO & DUBLIN, Ireland--(BUSINESS WIRE)--June 4, 2004--Biogen Idec (NASDAQ: BIIB) and Elan Corporation, plc (NYSE: ELN) announced today that they have submitted a Marketing Authorisation Application (MAA) to the European Medicines Agency for approval of ANTEGREN(R) (natalizumab) as a treatment for multiple sclerosis (MS).

The submission includes one-year data from two ongoing Phase III trials. The companies are committed to completing these two-year trials. In order to protect the integrity of the trials, the companies are not disclosing the one-year data at this time. Last month, Biogen Idec and Elan submitted a Biologics License Application (BLA) to the U.S. Food and Drug Administration (FDA) for the approval of natalizumab for MS.

"Based on the promising results in previous clinical trials and the one-year analysis from our Phase III studies, we believe natalizumab has the potential to meet a significant unmet need for MS patients around the world," said Burt Adelman, MD, executive vice president, Development, Biogen Idec. "Natalizumab's novel mechanism of action represents an innovative approach to treating MS."

"This submission represents a significant milestone for Elan and Biogen Idec and demonstrates our ongoing commitment to new therapies for MS patients," said Lars Ekman, MD, executive vice president and president Research & Development, Elan. "We will continue to work with European regulators during the review process to bring natalizumab to patients as quickly as possible."

MS is a chronic disease of the central nervous system that affects approximately 400,000 people in Europe and approximately one million people worldwide. It is a disease that affects more women than men, with onset typically between 20 and 40 years of age. Symptoms of MS may include vision problems, loss of balance, numbness, difficulty walking and paralysis.

About the MS Clinical Trials for ANTEGREN
The AFFIRM (natalizumab safety and efficacy in relapsing-remitting MS) trial is a two-year, randomized, multi-center, placebo-controlled, double-blind study of approximately 900 patients, evaluating the ability of natalizumab to slow the progression of disability in MS and reduce the rate of clinical relapses. The SENTINEL (safety and efficacy of natalizumab in combination with AVONEX(R) (Interferon beta-1a)) trial is a two-year, randomized, multi-center, placebo-controlled, double-blind study of approximately 1,200 patients with relapsing-remitting MS, evaluating the effect of the combination of natalizumab and AVONEX compared to treatment with AVONEX alone in slowing the progression of disability and reducing the rate of clinical relapses. Both study protocols provided for a one-year analysis of the data. The primary endpoints for both Phase III two-year trials in MS are based on the Expanded Disability Status Scale (EDSS) and relapse rate. The pre-specified primary endpoint of the one-year analysis was relapse rate.

About ANTEGREN (natalizumab)
Natalizumab, a humanized monoclonal antibody, is the first alpha-4 antagonist in the new selective adhesion molecule (SAM) inhibitor class. The drug is designed to inhibit the migration of immune cells into chronically inflamed tissue where they may cause or maintain inflammation. To date, approximately 2,800 patients have received natalizumab in clinical trials, and the safety profile continues to support further development. In placebo-controlled trials to date, in both Crohn's disease (CD) and MS, the most commonly reported adverse events in either group were headache, fatigue and nasopharyngitis.

Biogen Idec and Elan are collaborating equally on the development of natalizumab in MS, CD, and rheumatoid arthritis (RA).

Sources: Biogen Idec and Elan

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