Every single cancer is a genetic disease. Not necessarily inherited from your parents, but it's genetic changes which cause cancer. So as we sequence the genomes of tumours and compare those to the sequence of patients, we're getting down to the fundamental basis of each individual person's cancer.
Preventative medicine has to be the direction we go in. For example, if colon cancer is detected early - because a person knew he had a genetic risk and was having frequent exams - the surgery is relatively inexpensive and average survival is far greater than 10 years.
When I meet people who say - which they do all of the time - 'I must just tell you, my great aunt had cancer of the elbow and the doctors gave her 10 seconds to live, but last I heard she was climbing Mount Everest,' and so forth, I switch off quite early.
I have talked to women who do yoga, who are vegan, who have never smoked and/or never drank a day in their life, but they have Stage IV breast cancer. So you do what you can to be as healthy as you can if you know you're high-risk because yes, all those things can factor into that. But sometimes it's just a fluke.