Lance Armstrong
Before his titles were taken away, he won the Tour de France seven times in a row, from 1999 to 2005. He did this several years after having brain surgery, testicular surgery, and a long course of chemotherapy in 1996. The chemotherapy was to treat testicular cancer that spread to his brain and lungs. Armstrong used to race for the Discovery Channel Pro Cycling Team, but was only team leader during the Tour de France.