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Hi !
Once a person got cancer, its very difficult to eridicate from the body, as the tiny cancer cells sometimes stay in the body hidden some where, after all the treatments. When a cell starts multiplying it turns into a tiny tumor, which can be detected through scans.
When all the scans are clear and the blood clutures remain stable for a considerable period, and has no any cancer related symptoms, such as weight loss, and if the person returned to the normal life, like Lance Armstrong, he or she can then be considered as NED; No Evidence of Disease
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