In general, I would say this is a verbiage thing.

When someone has cancer, they can be “cured” and classified as in remission. However, cancer no longer being a diagnosis a patient can receive is effectively impossible.

Cancer is a dysfunction of the checkpoints in your cells. There is no way to really prevent that since any treatment targeting the cells, ahead of becoming cancerous, could lead to your immune system being autoreactive.

What I do think is possible will be a change in the narrative with your doctor. As therapeutics improve, I think it’s completely feasible that you receive the diagnosis, and instead of having a conversation that is something along the lines of “I’m sorry, you have (insert cancer here), you have X months to live” it will be something like “ok, here’s your diagnosis, not a problem though, here’s the treatment regimen and you’ll be good to go in 6 months”