He has yet to respond to Monday's news that the International Cycling Union has stripped him of his seven Tour de France titles for allegedly taking part in what the U.S. Anti-Doping Agency calls a massive doping program.
But sometimes actions speak louder than words. As recently as Monday night, Armstrong's Twitter bio read: "Father of 5 amazing kids, 7-time Tour de France winner, full time cancer fighter, part time triathlete."
It has since been changed to: "Raising my five kids. Fighting Cancer. Swim, bike, run and golf whenever I can."
As you can see, the Tour de France is no longer mentioned.
The change in his biographical information appears to be the only immediate reaction from Armstrong, who has steadfastly denied doping but eventually gave up his legal battle against the USADA's charges.
Armstrong's most recent tweet was on Oct. 17, when he linked to the statement announcing that he was stepping down as chairman of his Livestrong cancer-awareness charity.