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What Are the Stages of Breast Cancer?

  • Early stage or stage 0 breast cancer is when the disease is localized to the breast with no evidence of spread to the lymph nodes (carcinoma in situ).
  • Stage 1 breast cancer: The cancer is two centimeters or less in size and it hasn't spread anywhere.
  • Stage 2A breast cancer is a tumor smaller than two centimeters across with lymph node involvement or a tumor that is larger than two but less than five centimeters across without underarm lymph node involvement.
  • Stage 2B is a tumor that is greater than five centimeters across without underarm lymph nodes testing positive for cancer or a tumor that is larger than two but less than five centimeters across with lymph node involvement.
  • Advanced breast cancer (metastatic) results after cancer cells spread to the lymph nodes and to other parts of the body.
  • Stage 3A breast cancer is also called locally advanced breast cancer. The tumor is larger than five centimeters and has spread to the lymph nodes under the arm, or a tumor that is any size with cancerous lymph nodes that adhere to one another or surrounding tissue.
  • Stage 3B breast cancer is a tumor of any size that has spread to the skin, chest wall, or internal mammary lymph nodes (located beneath the breast and inside the chest).
  • Stage 3C breast cancer is a tumor of any size that has spread more extensively and involves more lymph node invasion.
  • Stage 4 breast cancer is defined as a tumor, regardless of size, that has spread to places far away from the breast, such as bones, lungs, liver, brain, or distant lymph nodes.

WebMD Medical Reference

Reviewed by Arnold Wax, MD on June 20, 2009
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