Autologous hematopoietic stem-cell transplant (AHSCT) has been around a while as a treatment for MS. The National MS Society has come out with recommendations about it.
From JAMA (October 26, 2020), there is this article, "Autologous hematopoietic stem-cell transplant in multiple sclerosis: Recommendations of the National Multiple Sclerosis Society":
Autologous Hematopoietic Stem Cell Transplant in Multiple Sclerosis: Recommendations of the National Multiple Sclerosis Society | Stem Cell Transplantation | JAMA Neurology | JAMA Network