PANCREATIC NEUROENDOCRINE TUMORS 
T: primary tumor
TXPrimary tumor cannot be assessed
T0No evidence of primary tumor
T1Tumor limited to pancreas, 2 cm or less in greatest dimension
T2Tumor limited to pancreas, more than 2 cm but less than 4 cm in greatest dimension
T3Tumor limited to pancreas, more than 4 cm in greatest dimension or tumour invading duodenum or bile duct
T4Tumor perforates serosa or invades other adjacent structures
N: regional lymph nodes
NXRegional lymph nodes cannot be assessed
N0No regional lymph node metastasis
N1Regional lymph node metastasis
M: distant metastasis
M0No distant metastasis
M1aHepatic metastasis only
M1bExtrahepatic metastasis only
M1cHepatic and extrahepatic metastases