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Copyright ©The Author(s) 2016.
World J Gastrointest Surg. Mar 27, 2016; 8(3): 212-221
Published online Mar 27, 2016. doi: 10.4240/wjgs.v8.i3.212
Table 2 7th edition of the American Joint Committee on Cancer’s staging system for small bowel adenocarcinoma
Primary tumor (T)Regional lymph nodes (N)Distant metastases (M)
Tx - Primary tumor cannot be assessedNx - Regional lymph nodes cannot be assessedMx - Distant metastases not assessed
Tis - Carcinoma in situN0 - No regional node metastasisM0 - Distant metastases not present
T1a - Tumor invades lamina propriaN1 - Metastasis in 1-3 regional nodesM1 - Distant metastases present
T1b - Tumor invades submucosaN2 - Metastasis in 4 or more regional nodes
T2 - Tumor invades muscularis propriaStage grouping
T3 - Tumor invades into the subserosaStage 0TisN0M0
Stage IT1-T2N0M0
T4 - Tumor perforates visceral peritoneum; or invades pancreas/bile ductStage IIAT3N0M0
Stage IIBT4N0M0
Stage IIIAAny TN1M0
Stage IIIBAny TN2M0
Stage IVAny TAny NM1