FASTER, PLEASE: Stem Cell Treatment Could Be a Game-Changer for People With MS. “People in the stem cell transplant group received chemotherapy to wipe out most of their current immune cells that were wrongly attacking neurons. They then took special medications to coax their stem cells, which produce the entire population of immune cells, out of the bone marrow and into the blood to start churning out new immune cells. After approximately three years, about 6% of the stem cell group experienced relapses, while 60% of the people in the control group receiving standard treatment relapsed.”