All of the above is true. You have to remember you will write your own story here. You are an individual biological human being - no two of us are the same - unless you're an identical twin and even then.... Not always. That said you can take two people with the exact same tumor, location, involvement, dr., hospital and treatment and get two entirely different outcomes.
The best you can do is get yourself the best treatment at the best location, do what you can to help yourself nutrition and hydration wise - educate yourself - on diet. Exercise a little (I'm talking walk your dog or your neighbors dog) for a few minutes a day. Then do ,what you have to do to finish treatment.
The live your life when you start to feel human again. Hugs. We all have our moments of sheer terror. See it for what it is and move past it. Hugs.