What does TNM mean?
TNM is a standardized grading system that identifies tumor, node, and metastases. The TNM (tumor, node, metastasis) staging system is used to construct stages that range from 0 (zero) to IV (four). There are three variables involved in the TNM system: “T” for tumor: TX unable to assess size T1 might mean primary tumor is smaller than 1 cm in diameter T2 might mean primary tumor is larger than 1 cm in diameter T3 might mean primary tumor is invading something non-resectable “N” for regional lymph nodes: NX nodal status unknown N0 would mean no tumor in regional lymph nodes N1 might mean tumor in a few nearby lymph nodes N2 might mean many nodes, or some nodes farther downstream, are involved “M” for metastases: MX unknown if distant metastases M0 would mean no distant metastases M1 would imply distant metastases, etc. For example, the TNM stage for a lung cancer that is invading or encasing the superior vena cava but has metastases only in two nearby lymph nodes might be T3 N1 M0. Clini
