T: primary tumor
TXPrimary tumor cannot be assessed
T0No evidence of primary tumor
TisCarcinoma in situ
T1aTumor 5 mm or less in greatest dimension
T1bTumor greater than 5 mm and less than 1 cm in greatest dimension
T1cTumor greater than 1 cm but no more than 2 cm in greatest dimension
T2Tumor more than 2 cm but no more than 4 cm in greatest dimension
T3Tumor and more than 4 cm in greatest dimension
T4Tumor involves celiac axis, superior mesenteric artery or common hepatic artery
N: regional lymph nodes
NXRegional lymph nodes cannot be assessed
N0No regional lymph node metastasis
N1Metastasis in 1?3 regional lymph nodes
N2Metastasis in 4 or more regional lymph nodes
M: distant metastasis
M0No distant metastasis
M1Distant metastasis