Let’s also learn the latest version of TNM staging and compare the staging criteria, so that we can determine the stage of lung cancer according to TNM staging. I. Definition of T, N and M in TNM staging of lung cancer 1. primary tumor T 2. regional lymph nodes N 3. distant metastasis M II. TNM staging of lung cancer The above is the latest version (eighth edition) of TNM staging criteria of lung cancer, which has been implemented since January 2017. If you still have questions, you can consult your doctor or experienced cancer friends directly, but self-help is also very important on the road of fighting cancer.