What causes a tumor to be cancerous?



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    Cancerous, or malignant tumors, are the result of active cancer cells (cells that are toxic and destroy other cells in the body) invading an area or even metastasizing (breaking away from the tumor, and invading the blood stream to start tumors elsewhere) in the body.  Benign tumors are actually made of inactive cancerous cells.  Cells that do not wish to seek out and eat other cells, only to multiply and spread.  Here’s a small fact sheet on the two types of tumors from Stanford.

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