It would depend on the situation, but in many cases, Stage 1 cancers can be pushed into remission. It's the earliest and most treatable stage.
It's impossible to be specific but without treatment, oh gee, I don't want to put it into words. For this type of cancer you simply must fight. Everything I've read said it doesn't take long to become terminal without treatment. If you are referring to yourself, please, please go though the treatments. At stage one you have a good fighting chance for a good outcome and without fighting it you have no chance at all. Don't make the world a poorer place - fight the thing. Cancer is a hateful thing and it doesn't deserve to win!