Staging Breast Cancer.swf

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The three ways that cancer spreads in the body are:

1. Through tissue. Cancer invades the surrounding normal tissue.
2. Through the lymph system. Cancer invades the lymph system and travels through the lymph vessels to other places in the body.
3. Through the blood. Cancer invades the veins and capillaries and travels through the blood to other places in the body.

When cancer cells break away from the primary (original) tumor and travel through the lymph or blood to other places in the body, another (secondary) tumor may form. This process is called metastasis. The secondary (metastatic) tumor is the same type of cancer as the primary tumor. For example, if breast cancer spreads to the bones, the cancer cells in the bones are actually breast cancer cells. The disease is metastatic breast cancer, not bone cancer.