Tysabri's drug's inventor believes a new test might identify people who are less at risk for a deadly side effect.

Reviving Tysabri

Matthew Herper, 10.27.09, 03:59 PM EDT

The drug's inventor believes a new test might identify people who are less at risk for a deadly side effect.

Worries about a potentially deadly side effect have long impeded sales of the multiple sclerosis drug Tysabri, made byElan. But now the medicine's inventor says he has created a diagnostic test that might reveal those patients who are less at risk of the side effect. That could increase the market for the drug, which is already a $1 billion seller.

Continue to read, by clicking here to read this Forbes posting

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