Cancers are staged clinically on a scale of I to IV based on the location of the cancer (confined to the site of origin, local penetration, metastases, etc.)where the worst prognosis is stage I and the best prognosis is stage IV.

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Cancers staged on a scale of I to IV have the best prognosis at stage I, where the cancer is usually confined to the site of origin, and the worst prognosis at stage IV, where the cancer has often metastasized to distant sites.

Cancers Are Staged Clinically on a Scale of I to IV