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| Classification/Grade | Mitotic count (per 10 hpf) | Ki 67 Index (%) |
|---|---|---|
| NET-G1 |
<2 |
<3 |
| NET-G2 |
2-20 |
3-20 |
| NEC-G3 | >20 | >20 |
NET: neuroendocrine tumor; NEC: neuroendocrine carcinoma. hpf: high power field; 10 HPF =2 mm2, at least 40 fields (at 400× magnification) evaluated in areas of highest mitotic density
