Question: who neuroendocrine tumors classification 2017?
Answer: #920 High Grade (G3) Neuroendocrine Neoplasms Should Be Further Classified According to Morphological Differentiation. Introduction: Neuroendocrine neoplasms (NENs) with a Ki-67 >20% (Grade 3) are classified together as Neuroendocrine Carcinomas (NEC), and are usually considered as poorly differentiated.