Breast cancer staging according tnm means what?

TNM breast cancer: Tnm is one of the staging system commonly used for cancer. It stands for t-tumor ( the size of the tumor- the bigger is the tumor the higher is the stage) ; n- nodal status ( involvement to the lymph glands) - and m- presence of metastatic disease to the distant organ. See more here: http://cancer.Gov/cancertopics/wyntk/breast/page7.

Based on pathology: T: size of the largest primary focus (don't add multiple foci n: nodal involvement (and total number of involved nodes) m: presence of distant mets the various combinations determine the pathologic stage. We are moving away from this sort of staging towards biologic/genomic staging that further subdivides the types of breast cancer and will allow better targeted therapy.