Cluster 1 included one single NET G2 with 15% Ki67-positive tumor cells, 7 NET G3 and 13 NEC, whereas Cluster 2 contained 8 NET G1, 13 NET G2 and 2 NET G3 (Chi-square test, p < 0.001). This evidence concerns the gene MKI67 and neuroendocrine carcinoma.