MTOR and carcinoid tumor: In pairwise comparison, the expression levels of mTOR and miRNAs were significantly higher in carcinoid tumors than in high-grade neuroendocrine carcinoma (LCNECs and SCCs, used as control groups), except for miR-155 and miR-199 that were expressed at higher levels in high-grade neuroendocrine carcinomas (all p < 0.01).