Doctors say they have achieved "mind-blowing" results in an attempt to rid people of haemophilia A. Patients are born with a genetic defect that means they do not produce a protein needed to stop bleeding. Thirteen patients given the gene therapy at Barts Health NHS Trust are now off treatment with 11 producing near-normal levels of the protein. Prof John Pasi, who led the trials at Barts and Queen Mary University of London, said: "This is huge. It's ground-breaking because the option to think about normalising levels in patients with severe haemophilia is absolutely mind-blowing. To offer people the potential of a normal life when they've had to inject themselves with factor VIII every other day to prevent bleeding is transformational." Bloody foreigners.