Tumors that are insular and can’t migrate to different parts of the body are benign and generally not cancerous. Tumors that can potentially migrate to different parts (metastasize)are called malignant and are cancerous. If you have early breast cancer, you have cancerous cells that originated in your breasts but are still only in that part of the body. If the cancer is late stage, that typically means the breast cancer has metastasized and is now present in different parts of the body- not just the breast. So it is possible to find breast cancer cells all over the body, but only if the original tumor metastasized
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