Seven-time Tour de France winner and cancer survivor Lance Armstrong is expected to be banned from cycling for life and stripped of his titles soon for doping.

The U.S. Anti-Doping Agency said Armstrong used performance enhancing drugs throughout his athletic career. The group called the case a "heartbreaking" example of a winning at all costs approach to sports.

Armstrong, 40, has fought legal battles for years against the USADA's accusations of doping.

After the group said Thursday that the famed cyclist should lose his titles and be banned for the sport, Armstrong maintained his innocence, but said he is tired of fighting.

"If I thought for one moment that by participating in USADA's process, I could confront these allegations in a fair setting and -- once and for all -- put these charges to rest, I would jump at the chance," Armstrong said in a lengthy statement Thursday evening. "But I refuse to participate in a process that is so one-sided and unfair."

He has maintained that he never failed a drug test. But witnesses, including former teammates, have claimed they saw Armstrong doping.

Betsy Andreau, a former teammate's wife, even testified under oath that while in the hospital in 1996 for cancer treatment, Armstrong told doctors he'd used drugs on the bike -- and named the drugs.

Other Tour de France athletes have also been caught up in their own battles with the anti-doping agency -- so much so that if Armstrong loses his titles, it's unclear who they could go to.

Armstrong's coach called the ordeal an "unjust" legal case.