For your information everyone has cancer cells in there body, and they wait dormant until something triggers them, like low immune system for one, there is NOcure for cancer
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While a cancer patient may be considered cured after 5 years or more of complete remission, meaning no signs of cancer are detected, it's not impossible that some cancer cells could still remain in the body. These cells may be dormant, too small to be detected by current testing methods, or have developed a resistance to treatment. The possibility of future recurrence, even years later, is why the term "cured" is often avoided, and doctors instead use terms like "remission" or "no evidence of disease".