Before the doping scandal, Lance Armstrong was known for his seven Tour de France victories, his comeback from cancer and the yellow bracelets of his foundation, Livestrong.
Armstrong launched the cancer charity after being diagnosed with a testicular tumor in 1996. The cancer had spread to his abdomen, lungs and brain, but he beat the odds to survive and continue his spectacular-- or notorious -- racing career.
Now that Armstrong's titles have been tainted by his admitted use of performance-enhancing drugs, questions have also been raised about whether those banned substances caused or contributed to his cancer.
Guest Alert: Chair of UCLA Urology, Dr. Mark Litwin Joins BC @ 12:50