Changes in your breast

Your entire body is made of living tissue. This tissue is made up of tiny cells. You can't see these cells with the naked eye. Normal cells divide (reproduce) in a controlled way. They grow when your body needs them, and die when your body doesn't need them any longer. When you have cancer, some cells change or become abnormal. These cells divide quickly, don't die when they should, and can spread into other parts of the body.

Stages of breast cancer

Tests are used to learn more about the cancer. Genetic testing of the tumor is taken into account, too. This process is called staging. The stage of your cancer will help to decide which treatment plan is best for you. Staging will give you this information:

• Size of the tumor
• If the cancer has spread to lymph nodes
• If the cancer has spread to other parts of the body
• Estrogen receptor (ER) status
• Progesterone receptor (PR) status
• Her2/neu (Her2) status
• Grade of the cancer

This information is used to put breast cancers into groups. The groups range from 0 to 4 and are written as Roman numerals (0, I, II, III, IV). Stage 0 is the lowest stage. The cancer is only found in the lining of the breast duct. Stage 0 may also be called DCIS (ductal carcinoma in situ). Stage IV is the highest stage and means that the cancer has spread beyond the breast to other parts of the body. The other stages range in between.

The stages of breast cancer are very complex. But the more details known about each person's cancer, the better doctors are able to focus treatment. Talk with your doctor about your stage, what it means for you, and how it affects your treatment plan and long-term outcomes.