Terminology | Differentiation | Grade | Mitotic rate* (mitoses/2 mm2) | Ki-67 index* (percent) |
NET, G1 | Well differentiated | Low | <2 | <3 |
NET, G2 | Well differentiated | Intermediate | 2 to 20 | 3 to 20 |
NET, G3 | Well differentiated | High | >20 | >20 |
NEC, small cell type (SCNEC) | Poorly differentiated | HighΔ | >20 | >20 |
NEC, large cell type (LCNEC) | Poorly differentiated | HighΔ | >20 | >20 |
MiNEN | Well or poorly differentiated¶ | Variable¶ | Variable¶ | Variable¶ |
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