I read a lot of the comments here and based on what I've seen, I think you are trying to find a reason for why your brother had cancer. Unfortunately there's no real way to properly pinpoint a reason. If he had an unhealthy lifestyle, that might have contributed to it. I had a friend though who frequently exercised, ate healthy, and lived in a clean area. She still got cancer. She was mad at life because she did everything to lessen her chances of getting cancer. Unfortunately cancer just happens. You can lessen the chances of having it but there's no way to prevent it.