Invasive breast cancers are types of cancers that are prone to spreading, either within the breast or beyond. Metastatic breast cancer is a specific stage of cancer indicating the spread to distant parts of the body.
Abnormal cells aren’t cancerous, but they may increase your risk of developing cancer. When you have abnormal cells that haven’t spread, the cells are considered noninvasive. This is sometimes referred to as pre-cancer or stage 0 cancer.
If abnormal cells move beyond the layer of tissue where they originated, the cells become invasive. When abnormal cells inside the milk ducts or lobules move out into nearby breast tissue, it’s considered a local invasion or invasive breast cancer.
These cells can also break free from the primary site and migrate to other parts of the body. When this happens, the cancer isn’t just invasive, it’s also metastatic.
Metastatic or stage 4 breast cancer is defined as cancer that has spread from the breast to distant parts of the body.
Learn more about the different stages of breast cancer here.
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