"These accusations threaten to undermine all I have stood and competed for, as well as my hard earned reputation. By linking me to allegations of cheating, damage done to my name and reputation can never be fully repaired, no matter how untrue I know them to be," said Radcliffe, whose marathon world record of 2 hours, 15 minutes, 25 seconds set in 2003 remains almost three minutes faster than any other woman has ever managed.