The US has approved the first treatment to redesign a patient's own immune system so it attacks cancer.
The regulator - the US Food and Drug Administration - said its decision was a "historic" moment and medicine was now "entering a new frontier".
The company Novartis is charging $475,000 (£367,000) for the therapy, which leaves 83% of people free of a type of blood cancer.
http://www.bbc.co.uk/news/health-41094990