Gastric Small Cell Neuroendocrine Carcinoma

**Semantic type:** Neoplastic Process

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

**Synonyms:** - Gastric Oat Cell Carcinoma - Gastric Small Cell Carcinoma - Gastric Small Cell Carcinoma - Oat Cell Carcinoma of Stomach - Oat Cell Carcinoma of the Stomach - Small Cell Carcinoma of Stomach - Small Cell Carcinoma of the Stomach