Five patients have taken part in a trial to test the feasibility of using their own stem cells to aid recovery from severe ischaemic stoke (where the blood supply is blocked by a clot or fat). The six-month study by researchers from Imperial College Healthcare NHS Trust and Imperial College London proved the therapy to be safe and the patients showed improvements in their condition. A larger trial is needed to confirm the technique’s effectiveness and that the improvements were not part of the patients’ natural recovery.