It's all attitude, Oz.
Cancer is a true downer; been there, done that, live in the constant shadow. Always will for however long.
As has been pointed out, make the most of what you've been given. Every day is a new and wonderful opportunity to be happy, to enjoy life.
PM me if you'd like to chat.
Mine was kidney cancer 3 years ago. Will it come back? Maybe, maybe not but that is immaterial. No one gets out of life alive, sooner or later it'll be my turn.
Until then, I do my best to enjoy every day.
Good luck!