Digestive System Neuroendocrine Carcinoma

**Semantic type:** Neoplastic Process

**Definition:** An aggressive high-grade carcinoma with neuroendocrine differentiation that arises from the digestive system. It is composed of malignant small or large cells. The mitotic count is more than 20 per 2 mm2 and/or the Ki-67 index is more than 20% (often more than 70%).

**Synonyms:** - Gastrointestinal NEC - Gastrointestinal Neuroendocrine Carcinoma - Gastrointestinal System Neuroendocrine Carcinoma