What the number staging system is
There are 4 number stages of breast cancer. Staging takes into account various factors, including
- The size of the tumor (tumor means either a breast lump or the area of cancer cells found on a scan or mammogram)
- Whether cancer cells have spread into the nearby lymph glands (lymph nodes)
- Whether the tumor has spread to any other part of the body metastasized)
The tests and scans you have when diagnosing your cancer give some information about the stage.