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Dukes classification

a classification of the extent of operable adenocarcinoma of the colon or rectum commonly modified as follows: a (dukes a), confined to the mucosa; B1, into the muscularis mucosae; B2, through the muscularis mucosae; C1, limited to the bowel wall, with nodal metastases; C2, through the bowel wall, with nodal metastases.