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Metastasis

Metastasis is the gradual progression of cancerous cells from one organ (primary tumor) to the other. Usually, cancerous cells spread from the primary tumor and invade the lymphatic system and blood vessels, then they pass through the circulation and grow up in a nearby organ (metastasize) within normal tissues somewhere else in the body.

Metastasis occurs when cancer cells attain the property of increased motility and invasiveness. Cells that metastasize in other tissues are fundamentally of the same type as those in the primary tumor. 

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