Very variable: Basal cell carcinoma of the skin almost never spreads, except by contiguous extension. At the other extreme are melanomas which sometimes are widely disseminated when first diagnosed.
Answered 7/22/2013
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Varies: Each cancer is unique. Some cancer cells have the ability to metastasize very early in their development while other can be slower to metastasize.
Answered 4/30/2013
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