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Classification of gastroenteropancreatic neuroendocrine tumors according to the World Health Organization 2010
| Grade I | Grade II | Grade III | |
| Tumor size in cm | ≤ 2 | > 2 | Any |
| Mitoses/10 HPF | < 2 | 2–20 | > 20 |
| Ki 67 index, % | < 3 | 3–20 | > 20 |
| Differentiation | Well differentiated | Well differentiated | Poorly differentiated |
Adapted from[18]. HPF: High-power fields.
