What does this mean?

Hi Deamo1. Until very recently, staging of breast cancer (Anatomic Stage) was done only by reference to the TNM (tumor, nodal status, metastasis) classifications. There have recently been some changes to make the (new) preferred staging system (Prognostic Stage), taking into account a fuller picture of one's disease and disease state, and with reference to grade, IHC characteristics, and genomic assay results, in any cases for which these laboratory results can be had for breast cancer tissue..

The prefix letter C indicates that that staging is from clinical findings. Pathologic findings (as from a pathology laboratory report) would be indicated by the prefix letter P.

Here is a very general overview of the changes. I have seen that there is also a comprehensive guide to the new staging system available on the internet.

https://onlinelibrary.wiley.com/doi/full/10.3322/caac.21393

T refers to the tumor size. T2 = tumor between 20 & 50 mm

N is lymph nodes. N1 can refer to several different things. I'll post a link below.

M refers to metastases. M0 means no metastases.

https://www.cancer.net/cancer-types/breast-cancer/...