He recently answered questions for BookPage. You have proven you can beat cancer.
Nobody beats cancer.
You can do everything your doctor tells you, eat all the right foods, and still die from it, while the guy who smokes and doesn't listen to his doctor is somehow spared. I was very, very lucky. As far as what's left for me to prove, there are plenty of things. I'd like to prove I can win the Tour de France again, and be a consistent champion. But I'm just as interested in the more open ended questions.