The reputation of Richard Horton, editor of The Lancet, has been tied to that of Andrew Wakefield ever since the controversial study on MMR was published six years ago. He ran his old colleague’s research to the surprise of some experts. Last week, after being shown the evidence of The Sunday Times investigation, he admitted publishing was a mistake. He was apparently so startled by our findings that he immediately went public, despite an agreement that he was shown them in confidence. Medical insiders now wonder if he can survive the scandal that has damaged The Lancet.