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. Author manuscript; available in PMC: 2021 Sep 1.
Published in final edited form as: Ann Surg Oncol. 2020 Jul 6;27(9):3270–3280. doi: 10.1245/s10434-020-08787-x

Table 1.

Classification for Neuroendocrine Neoplasms

Well Differentiated NET Ki-67 index (%) Mitotic index
Grade 1 <3 <2/10 HPF
Grade 2 3–20 2–20/10 HPF
Grade 3 >20 >20/10 HPF
Poorly Differentiated NEC
Grade 3 (Neuroendocrine Carcinoma) >20 >20/10 HPF