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The World Health Organization 2017 classification for neuroendocrine neoplasms.
| NET-G1 | NET-G2 | NET-G3 | NEC-G3 |
|---|---|---|---|
| Well-differentiated Mitotic count < 2/2 mm2 Ki-67 ≤ 2% |
Well-differentiated Mitotic count < 2–20/2 mm2 Ki-67 3–20% |
Well-differentiated Mitotic count > 20/2 mm2 Ki-67 > 20% |
Poorly differentiated Mitotic count > 20/2 mm2 Ki-67 > 20% |
NET: neuroendocrine tumor; NEC: neuroendocrine carcinoma.
