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- Dictionarymetastasis/mɪˈtastəsɪs/
noun
- 1. the development of secondary malignant growths at a distance from a primary site of cancer: "an increased risk of metastasis"
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Metastasis is a pathogenic agent's spread from an initial or primary site to a different or secondary site within the host's body; the term is typically used when referring to metastasis by a cancerous tumor. The newly pathological sites, then, are metastases (mets). It is generally distinguished from cancer invasion, which is the direct extension and penetration by cancer cells into neighboring t... Wikipedia