MKI67 and neuroendocrine carcinoma: There were 52 patients defined as G1 NET (grade 1 neuroendocrine tumor; mitotic count 2/10 HPF, Ki-67 ≤2%), 32 as G2 NET (mitotic count 2–20/10 HPF, Ki-67 3–20%), 11 as G3 NEC (neuroendocrine carcinoma; mitotic count >20/10 HPF, Ki-67 >20%).