The number of years required to pronouce cancer as "cured" or "gone" varies according to the type of cancer and the part of the body affected.

My cancer was in my neck, and I (like all successfully-treated head-and-neck-cancer survivors) was given a clean bill of health after only one year.

I was told that other cancers required "at least three yeears" before a similiar conclusion could be reached. I suppose that means that three years is enough in some cases, longer periods such as five years for others.