title: Gastric mixed adenoneuroendocrine carcinoma with thyroid transcription factor-1-positive neuroendocrine component.
abstract: Small cell carcinoma of the stomach, which is considered synonymous with neuroendocrine carcinoma, is rare. We encountered a case of mixed adenoneuroendocrine carcinoma. Gastrointestinal endoscopy revealed a type 0 IIa + IIc lesion in the stomach. Biopsy suggested well-differentiated adenocarcinoma. Endoscopic submucosal dissection was performed and gastric cancer comprising both well to moderately differentiated adenocarcinoma within the mucous membrane and small cell carcinoma invading to the submucosa with accompanying vessel invasion was found. Mixed adenoneuroendocrine carcinoma was diagnosed and the small cell carcinoma was thyroid transcription factor-1 positive. No tumor lesions were apparent in other organs, so distal gastrectomy and lymph node dissection were performed. Lymph node metastases were not observed. The patient is currently alive without recurrence. Thyroid transcription factor-1-positive gastric neuroendocrine carcinoma is very rare, and the thyroid transcription factor-1-positive rate may contribute to the prediction of prognosis and treatment selection. Accumulation of cases is thus very important.
authors.affiliation: Department of Surgery, Matsue Red Cross Hospital, 200 Horo-machi, Matsue, Shimane, 690-8506, Japan, emi-med-ml@poppy.ocn.ne.jp.
authors.forename: Emi
authors.initials: E
authors.lastname: Yamaguchi
authors.forename: Yoshitoshi
authors.initials: Y
authors.lastname: Sato
authors.forename: Takafumi
authors.initials: T
authors.lastname: Oe
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nishi
authors.forename: Makoto
authors.initials: M
authors.lastname: Koike
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Kitakado
authors.forename: Kenji
authors.initials: K
authors.lastname: Takubo
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology* / Q000601:surgery; D000368:Aged; D018278:Carcinoma, Neuroendocrine / Q000473:pathology* / Q000601:surgery; D005743:Gastrectomy; D006801:Humans; D008197:Lymph Node Excision; D008297:Male; D009361:Neoplasm Invasiveness; D009687:Nuclear Proteins / Q000032:analysis*; D013274:Stomach Neoplasms / Q000473:pathology* / Q000601:surgery; D000074482:Thyroid Nuclear Factor 1; D014157:Transcription Factors / Q000032:analysis*
chemical_list: C000614412:NKX2-1 protein, human; D009687:Nuclear Proteins; D000074482:Thyroid Nuclear Factor 1; D014157:Transcription Factors
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