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Copyright copy;2010 Baishideng Publishing Group Co.
World J Gastroenterol. Sep 28, 2010; 16(36): 4519-4525
Published online Sep 28, 2010. doi: 10.3748/wjg.v16.i36.4519
Table 1 World Health Organization classification of pancreatic neuroendocrine tumors
WHO classificationWell-differentiated neuroendocrine tumorWell-differentiated neuroendocrine carcinomaPoorly-differentiated neuroendocrine carcinoma
Biological behaviorBenign/uncertain behaviorLow malignancyHigh malignancy
Metastases-++
Ki-67/MIB-1 index (%)< 22-20> 20
Pathological differentiationWell-differentiatedWell-differentiatedPoorly-differentiated
Vascular invasion-/+++
Size (diameter) ≤ 2 cm> 2 cmAny size