Evaluating the Presence of a Stage IV Low-Grade Well-Differentiated Neuroendocrine Tumor of the Ileocecum: A Case Report with Evaluation of Staging Protocol of Neuroendocrine Tumors and Treatment Options Based on Current Available Evidence

Table 3

Classification and grading of well-differentiated NET of the gastrointestinal tract (World Health Organization, 2019) [27].

Terminology	Grade	Mitotic index (mitoses/2 mm^2)	Ki-67 index (%)
NET, G1	Low	<2	<3
NET, G2	Intermediate	2–20	3–20
NET, G3	High	>20	>20