"This type of stem cell therapy is very aggressive and does carry significant risks, so we would strongly urge caution in seeking this treatment outside of a properly regulated clinical trial," said Dr Sorrel Bickley, Research Communications Manager at the MS Society.
"Since we started treating patients three years ago, some of the results we have seen have been miraculous. This is not a word I would use lightly, but we have seen profound neurological improvements" told Professor Basil Sharrack, a consultant neurologist at Sheffield Teaching Hospitals NHS Foundation Trust. He also warned: "This is not a treatment that is suitable for everybody because it is very aggressive and patients need to be quite fit to withstand the effects of the chemotherapy."
The related research has been published in the Journal of the American Medical Association.
Stem cells are taken from the patient's own blood. It's like "rebooting" the immune system.