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2010 World Health Organization grading classification of gastroenteropancreatic neuroendocrine neoplasms
| Classification/grade | Mitotic index (per 10 HPF) | Ki67 index (%) |
| G1 (NET G1) | < 2 | < 2 |
| G2 (NET G2) | 2-20 | 2-20 |
| G3 (NEC) | > 20 | > 20 |
HPF: High-power field; NET: Neuroendocrine tumor; NEC: Neuroendocrine carcinoma.
