MKI67 and neuroendocrine neoplasm: Recognizing this void in the literature, the main objectives of this study were to: i) compare mitotic rate and Ki-67 index using transcriptomic data in neuroendocrine samples, and ii) identify the strongest indicator of the biological behavior among the histological subtypes of neuroendocrine tumors, i.e., carcinoids and LCNEC’s.