After a breast cancer diagnosis, staging establishes the extent and characteristics of your breast cancer.
Breast cancer staging is complex and considers many different factors, such as the size and location of a breast cancer tumor and whether cancer cells have spread to your lymph nodes or other areas of your body.
In this article, we explain how doctors determine breast cancer staging and provide an overview of each stage of breast cancer.
How is breast cancer staging determined?
According to the American Cancer Society (ACS)Trusted Source, the most common staging system for breast cancer is the one developed by the American Joint Committee on Cancer. You may also see this called the TNM system, in which:
T refers to the size of the tumor
N indicates whether or not the cancer has spread to nearby lymph nodes
M denotes if the cancer has spread to more distant lymph nodes or to other organs in your body
In 2018, this system was updated to also include other factors called biomarkers into breast cancer staging. These include:
the hormone receptor and HER2 status of the cancer
the grade of the cancer, which is how the cancer appears compared with typical breast tissue
the cancer’s Oncotype DX, which is a gene expression test that predicts the likelihood of breast cancer spreading to somewhere else in the body
Once all of the factors above have been evaluated, your cancer will receive an overall stage. There are five stages of breast cancer, numbered 0 through 4.
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