Seven-time Tour de France winner Lance Armstrong announced he has decided not to continue his fight against the US Anti-Doping Agency's claims that he used performance-enhancing drugs.

Armstrong, while still maintaining his innocence, said in a statement on his website that he had made his decision after a US federal court dismissed his lawsuit against USADA, paving the way for the agency to continue its probe into the retired American cyclist.

"Today I turn the page. I will no longer address this issue, regardless of the circumstances," Armstrong wrote.

"I will commit myself to the work I began before ever winning a single Tour de France title: serving people and families affected by cancer, especially those in underserved communities."