Lance had a promising career as a cyclist, and he went on to win the Tour de France seven times. In 1996, he was "diagnosed" with cancer (however, it is revealed that he faked it the whole time just so people would like him) (Lance's Legacy). He apparently conquered the disease.
He formally retired from cycling in 2011, but in 2012 investigations uncovered that he had been cheating the whole time, using steroids to boost his performance. He was stripped of all seven titles and banned from cycling forever.