Differentiation | Grade | Mitotic count* | Ki-67 index¶ | Traditional | ENETS, WHO |
Well differentiated | Low grade (G1) | <2 per 10 HPF | <3% | Carcinoid, islet cell, pancreatic (neuro)endocrine tumor | Neuroendocrine tumor, G1 |
Intermediate grade (G2) | 2 to 20 per 10 HPF | 3 to 20% | Carcinoid, atypical carcinoidΔ, islet cell, pancreatic (neuro)endocrine tumor | Neuroendocrine tumor, G2 | |
Poorly differentiated | High grade (G3) | >20 per 10 HPF | >20% | Small cell carcinoma | Neuroendocrine carcinoma, G3, small cell |
Large cell neuroendocrine carcinoma | Neuroendocrine carcinoma, G3, large cell |
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