Table 1. . WHO classification and grading (2010) of gastro-entero-pancreatic neuroendocrine neoplasms.

				Mitotic count	Ki67 index
Neuroendocrine tumor	Low grade	G1		<2 mitoses/hpf	≤2%
	Intermediate grade	G2		2–20 mitoses/hpf	3–20%
Neuroendocrine carcinoma	High grade	G3	Small cells or large cells	>20 mitoses/hpf	>20%

hpf: High power field.

Reproduced with permission from [10].