Certain types of cancer may be genetically based, but that still wouldn't make them evolutionary. A genetic defect is evolutionary only if it affects the ability to reproduce (by death or sterilization). Since the vast majority of cancers affect one's health far beyond the age to reproduce, they are not evolutionary & don't participate in any kind of "natural selection".

By contrast, any gene that causes people to participate in risky behavior at a young age (eg, racing motorcycles), could be evolutionary. 🙂

A couple years ago I paid four (early teens) boys to do some extensive yard work for me. I thought teenage girls were chatterboxes, but these boys had them beat. They were all discussing their broken bones. I offered that I had never broken a bone in my life. One boy popped up & said, "neither have I", to which another replied, "yes, but you are 13, & he is 80."

So, I have the "cautious gene". 🙂 I suppose it affects my decision to remain on ADT & suffer side effects.