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Copyright ©The Author(s) 2021.
World J Clin Oncol. Oct 24, 2021; 12(10): 897-911
Published online Oct 24, 2021. doi: 10.5306/wjco.v12.i10.897
Table 1 Comparison of 2010 and 2017 World Health Organization classification system for pancreatic neuroendocrine tumors
WHO 2010 Classification system
WHO 2017 Classification system
Ki-67 index (%)
Mitotic index1
Well-differentiated PanNET G1Well-differentiated PanNET G1< 3< 2
Well-differentiated PanNET G2Well-differentiated PanNET G23-202-20
Well-differentiated PanNET G3> 20> 20
Poorly-differentiated PanNEC G3 (i.e. small cell carcinoma, large cell carcinoma)Poorly-differentiated PanNEC G3 (i.e. small cell carcinoma, large cell carcinoma)> 20> 20
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