Bayer drug delays MS in half of patients-MRI study

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A long-term study of brain scans in multiple sclerosis patients showed only about half of the patients who took the drug interferon beta 1-b got a long-lasting benefit, U.S. researchers said on Monday.

Patients in the small, three-year study were treated with the Bayer drug, which is sold under the trade name Betaseron in the United States or Betaferon elsewhere.

The drug is designed to reduce the number of disease flareups.

Multiple sclerosis occurs when the immune system attacks the myelin sheath protecting nerve cells. It affects 2

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