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| Grade 1 (G1) | Grade 2 (G2) | Grade 3 (G3) | |
|---|---|---|---|
| Ki-67 index | <3% | 3-20% | >20% |
| Mitotic count | <2/10 HPF | 2-20/10 HPF | >20/10 HPF |
| Differentiation | Well differentiated | Well differentiated | Poorly differentiated |
| 5-year survival rate | 85% | 78% | 9% |
Survival data from Ellison TA, et al. (30). WHO, World Health Organization; HPF, high power field; pNETs, pancreatic neuroendocrine tumors.
