The U.S. Anti-Doping Agency erased 14 years of Lance Armstrong's career on Friday - including his record seven Tour de France titles - and banned him for life from the sport that made him a hero to millions of cancer survivors after concluding he used banned substances.
USADA said it expected cycling's governing body to take similar action, but the International Cycling Union was measured in its response, saying it first wanted a full explanation on why Armstrong should relinquish titles he won from 1999 through 2005.
The Amaury Sport Organization that runs the world's most prestigious cycling race said it would not comment until hearing from USADA and the UCI.
Armstrong, who retired a year ago, said Thursday that he would no longer challenge USADA. He denied again that he ever took banned substances in his career.