Help pls so confused. Is it true that cancer in its early stages, although curable, can return due to "metastasis" that happened?

I read somewhere that cancer mets can happen years after treatment, how does that work? if someone is considered clear? Also, what testing procedures do doctors use to officially confirm the stage of a diagnosis? And does a single metastasis have a curable prognosis? Does "metastasis" imply lymph... show more I read somewhere that cancer mets can happen years after treatment, how does that work? if someone is considered clear?

Also, what testing procedures do doctors use to officially confirm the stage of a diagnosis?
And does a single metastasis have a curable prognosis?
Does "metastasis" imply lymph node/organ spread or whole body/bone spread?
Cervical cancer patient
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