Abstract Details Title Efficacy of Natalizumab after Insufficient Response to Other Disease Modifying Therapies for the Treatment of Relapsing Remitting Multiple Sclerosis Topic MS and Related Diseases Presentation(s) (-) Poster/Presentation Number 175 Objective Background Design/Methods Results Conclusions Authors/Disclosures Toby I. Gropen, MD (University of Alabama At Birmingham) Dr. Gropen has nothing to disclose.