Heart gene therapy patient on new trial
5 September 2013 Last updated at 18:15 BST
A trial of a gene therapy to treat heart failure has started at a London hospital.
Heart failure affects more than 750,000 people in the UK. Numbers are growing as more people survive heart attacks, but with damaged and weakened organs.
The trial uses a genetically modified virus which contains instructions to produce a protein that heart failure patients are lacking in their heart muscle.
David Palmer told the BBC's medical correspondent Fergus Walsh how the treatment was not a cure but had given him hope for the future.