MKI67 and gastric neuroendocrine tumor, well differentiated, low or intermediate grade: In gastric NETs, the best prognostic stratification of patients is achieved by combining the clinico-pathologic subtype (type1, type 2, and type 3 gastric NETs), which is per se of prognostic value, with the Ki67 proliferative index, especially in patients with type 3 NETs [62].