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Stages Of Breast Cancer:


Stage O: Cancer cells remain inside the breast duct, without invasion into normal adjacent breast tissue.

Stage 1: Cancer is 2 centimeters or less and is confined to the breast (lymph nodes are clear).


Stage 2a: No tumor can be found in the breast, but cancer cells are found in the lymph nodes under the arm OR
The tumor measures 2 centimeters or smaller and has spread to the axillary lymph nodes OR
The tumor is larger than 2 but no larger than 5 centimeters and has not spread to the axillary lymph nodes.


Stage 2b: The tumor is larger than 2 but no larger than 5 centimeters and has spread to the axillary lymph nodes OR
The tumor is larger than 5 centimeters but has not spread to the axillary lymph nodes.


Stage 3a: No tumor found in the breast. Cancer is found in axillary lymph nodes that are sticking together or to other structures, or cancer may be found in lymph nodes near the breastbone OR The tumor is any size. Cancer has spread to the axillary lymph nodes, which are sticking together or to other structures, or cancer may be found in lymph nodes near the breastbone.

Stage 3b: The tumor may be any size and has spread to the chest wall and/or skin of the breast and may have spread to axillary lymph nodes that are clumped together or sticking to other structures OR

Cancer may have spread to lymph nodes near the breastbone. Inflammatory breast cancer is considered at least stage 3b.

Stage 3c: There may either be no sign of cancer in the breast or a tumor may be any size and may have spread to the chest wall and/or the skin of the breast AND The cancer has spread to lymph nodes either above or below the collarbone AND The cancer may have spread to axillary lymph nodes or to lymph nodes near the breastbone.

Stage 4: The cancer has spread — or metastasized — to other parts of the body.
 
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