An experimental gene therapy has cured MS in mice.
The paper is:
Geoffrey D. Keeler, Sandeep Kumar, Brett Palaschak, Emily L. Silverberg, David M. Markusic, Noah T. Jones, Brad E. Hoffman. "Gene Therapy-Induced Antigen-Specific Tregs Inhibit Neuro-inflammation and Reverse Disease in a Mouse Model of Multiple Sclerosis." Molecular Therapy (2017). DOI: 10.1016/j.ymthe.2017.09.001