To put it frankly, I have been avoiding this thread (from title) until now, and once I started to read I could not stop until I read all 14 pages of posts.
My experience has been quite different with my family. I have no cancer history in my family, but on my mom's side everybody died quite sudden from heart disease, usually from sudden massive heart failure.
You however have a fighting chance, where my family, and likely me will die of the silent killer.
Given any choice at all, I would prefer to have a chance to fight against the dark; soldier on, beat this cancer and live!
Most of all, love your family and the support they give. I would have given anything to have kept my 4 uncles around for additional months or years. Now my mum (the youngest now 67) is only one on her side still alive, and I worry a lot as she is now alone since her husband has also die from enlarged heart last year.
Never give up!