The treatment uses the patient’s own stem cells extracted from a sample of their bone marrow. They’re multiplied and matured to make them behave more like brain cells, then injected back into the patient where the cells help repair the brain and spinal cord. Researchers hope the treatment can decrease brain inflammation that causes worsening of ALS.

About 200 people are being recruited to take part in the clinical trial. Three previous smaller trials showed positive results. Researchers will know the results of this study next year.