WHO class | Description | Proliferation index (PI; Ki-67) | Size |
---|---|---|---|
I | Neuroendocrine tumour (NET) | < 2% | <2 cm |
II | Neuroendocrine tumour (NET) | 3-20% | HASH(0x2f82cc8) 2 cm |
III | Neuroendocrine carcinoma (NEC) | HASH(0x2f82cc8) 20% | Large |
IV | Mixed adenoneuroendocrine carcinoma (MANEC) | ||
V | Hyperplastic and preneoplastic lesions |