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特許 係属中 Metastasis, or metastatic disease, is the spread of a cancer from one organ to another. The new occurrences of disease thus generated are referred to as metastases (sometimes abbreviated "mets").[1][2] It was previously thought that only malignant tumor cells and infections have the capacity to metastasize (also spelled metastasise); however, this is being reconsidered due to new research.