Table 3.
Classifications of neuroendocrine neoplasms of the head and neck, lung and GI and pancreas [4, 26–28]
| Head and neck | Lung | GI and Pancreas |
|---|---|---|
| Well-differentiated NEC | Carcinoid | Well-differentiated NET |
| Grade 1 (NET G1) | ||
| Grade 2 (NET G2) | ||
| Grade 3 (NET G3) | ||
| Moderately-differentiated NEC | Atypical carcinoid | |
| Poorly-differentiated NEC | Poorly-differentiated NET: neuroendocrine carcinomas (G3) | |
| SC-NEC | Small cell carcinoma | Small cell type |
| LC-NEC | Large cell neuroendocrine carcinoma | Large cell type |
| Combined small cell carcinoma Combined large cell neuroendocrine carcinoma |
Mixed neuroendocrine-non-neuroendocrine neoplasm |
NECneuroendocrine carcinoma, SC-NEC small cell neuroendocrine carcinoma, LC-NEC large cell neuroendocrine carcinoma, NET neuroendocrine tumor