The benefit of integrating safety data from the FDA mandated registry with medwatch reports: A Southern Network on Adverse Reactions (SONAR) analysis based on the Tysabri Outreach Commitment to Health Registry (TOUCH)

e18237Background: Natalizumab is an effective therapy for multiple sclerosis. Its most notable toxicity is PML. The FDA mandated registry, TOUCH, focuses on PML cases. We identified an unusual case...