TNM staging of colorectal carcinoma.
The current international standard is the TNM system where T denotes tumour, N lymph nodes and M metastases. N0 signifies no nodes involved, N1 one to three nodes and N2 four or more nodes. M0 denotes no evidence of distant metastases while M1 signifies histologically confirmed distant metastases. There are also the Dukes and the Astler-Coller classifications.
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