Dukes staging:
A - Tumour confined to bowel wall
B - Tumor penetrates bowel wall
C - Regional lymphnode involved
D - Distant metastasis
TNM:
T1 - Submucosal involvement
T2 - Muscularis propria involvement
T3 - Beyond muscularis propria
T4 - Peritoneal surface involvement
N1 - up to 3 perirectal/ colic nodes
N2 - 4 or more perirectal/ colic nodes
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