Clinical outcomes of small cell neuroendocrine carcinoma and adenocarcinoma of the gallbladder

Table 1 Grading of gastroenteropancreatic neuroendocrine tumors

Grade	GET-NETs
Low (ENETS G1)	< 2 mitoses/10 HPF and < 3% Ki-67 index
Intermediate (ENETS G2)	2-20 mitoses/10 HPF or 3%-20% Ki-67 index
High (ENETS G3)	> 20 mitoses/10 HPF or > 20% Ki-67 index

ENETS: European Neuroendocrine Tumor Society; HPF: High-power fields.