Well, Simon, it looks as though you should change the title of this thread. It seems like you might get that Class 1 after all.
As for what differentiates the 92% from the 8%? Who knows, really? What decides who gets cancer and who doesn't, or who falls under a bus tomorrow and who doesn't? We none of us know how long we've got, or what decides it. You're no different from others in that respect.
As to fighting, a friend of mine had cancer, and kept being told she was a fighter and would therefore beat it. She said that scared the hell out of her. When told she'd need a second dose of chemo, she found herself wondering if she wasn't fighting hard enough. She felt the attitude that it was down to her, implied that it was her fault she was so sick!!! For the record, that's nine years ago, and she's just fine. But I don't know that a fighting spirit will help you beat cancer; it might, but I don't know and neither does anyone else. But it WILL help you deal with whatever life throws at you. So chin up, walk tall, and know that we're all routing for you. And when you can't do that, and need a shoulder to cry on....we'll be there for you then too.