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from Wikipedia, the free encyclopedia

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Metastasis

Metastasis is the spread of cancer from its primary site to other places in the body (e.g., brain, liver).

Cancer cells can break away from a primary tumor, penetrate into lymphatic and blood vessels, circulate through the bloodstream, and grow in a distant focus (metastasize) in normal tissues elsewhere in the body.

Note:   The above text is excerpted from the Wikipedia article "Metastasis", which has been released under the GNU Free Documentation License.
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