Oct. 8, 1996 - Armstrong announces the medical findings in a press conference.

Oct. 24, 1996 - He undergoes surgery to remove two cancerous lesions from his brain.

December 1996 - Doctors tell Armstrong he is cancer-free.

1997 - He establishes the Lance Armstrong Foundation to benefit cancer research and cancer patients.

1999 - Armstrong wins his first Tour de France, riding with the U.S. Postal Team.

2000 - Wins the Tour de France for a second consecutive year.

2000 - Publishes book "It's Not About the Bike: My Journey Back to Life."

2001 - Wins the Tour de France for the third time.

2002 - Wins his fourth consecutive Tour de France.

2002 - A 21-month investigation into whether the U.S. Postal Team used performance enhancing drugs during the 2000 Tour de France closes after finding no evidence of illegal drug use.

July 27, 2003 - Armstrong wins his fifth consecutive Tour de France by 61 seconds.

June 15, 2004 - Announces he is suing the author of a book accusing him of taking performance-enhancing drugs.

June 21, 2004 - A Paris court throws out a request by Armstrong for an emergency ruling ordering the publishers of a book detailing suggestions of doping to insert a denial by Armstrong.

July 25, 2004 - Wins his sixth consecutive Tour de France.

April 18, 2005 - Announces that he will retire after competing in the 2005 Tour de France.

July 24, 2005 - Wins his seventh Tour de France.

Dec. 14, 2005 - Armstrong is indicted in an Italian court and is ordered to stand trial for defaming cyclist Filippo Simeoni. Charges are later dropped in April 2006.

May 31, 2006 - A report from the International Cycling Union is released that clears Armstrong's name of doping allegations from 1999.

Sept. 9, 2008 - Announces his return to professional cycling.

March 24, 2009 - Falls along with 15-20 other riders during a race in Spain and breaks his collarbone.