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explain why only some cells in a tumor are capable of metastasis

explain why only some cells in a tumor are capable of metastasis
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Unlike normal cells, cancer cells have the ability to grow outside of the place in the body where they originated. When this happens, it  called metastatic cancer. No,all types of cancer do not have the ability to metastasize, but whether they do depends on a variety of individual factors.

When cancer cells break away from a tumor, they can travel to other parts of the body through the bloodstream or the lymph system. ... Many of these cells die, but some may settle in a new area, start to grow, and form new tumors. This spread of cancer to a new part of the body is called metastasis.

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