title: Mixed adenoneuroendocrine carcinoma of gastrointestinal tract: report of two cases.
abstract: Mixed adenoneuroendocrine carcinoma (MANEC) is a rare tumor of the gastrointestinal tract that consists of a dual adenocarcinomatous and neuroendocrine differentiation, each component representing at least 30% of the tumor. To date, only seven cases have been reported in the cecum, and less than 40 in the stomach. Our first case was diagnosed in a 74-years-old female as a polypoid lesion of the cecum with direct invasion in the transverse colon, without lymph node metastases. The second case was diagnosed in the stomach of a 46-years-old male as a polypoid tumor of the antral region that invaded the pancreas and presented metastases in 22 regional lymph nodes. The metastatic tissue was represented by the glandular component. In both cases, the tumor consisted of a moderately-differentiated tubular adenocarcinoma (with mucinous component in Case 1) intermingled with neuroendocrine carcinoma. Ki67 index was lower than 20% in Case 1, respectively higher than 20% in Case 2. The neuroendocrine component was marked by synaptophysin and neuron specific enolase, being negative for Keratins 7/20. The neuroendocrine component represented 60% in Case 1, and 40% in Case 2, respectively. The glandular components were marked by carcinoembryonic antigen, maspin and keratin 20/7 (Case 1/2). Both cases were proved to be microsatellite stable. Independently by the localization and tumor stage, MANECs appear to be highly malignant tumors, with high risk for distant metastases. The aggressiveness seems to depend on the endocrine component, independent of its proportion. The neuroendocrine component could be a dedifferentiated adenocarcinoma with a neuroendocrine phenotype.
authors: Simona Gurzu, Zoltan Kadar, Adrian Tamasi, Ioan Jung, Department of Pathology, University of Medicine and Pharmacy, 540139 Tirgu Mures, Romania.
authors: Simona
authors: S
authors: Gurzu
authors: Simona Gurzu, Zoltan Kadar, Adrian Tamasi, Ioan Jung, Department of Pathology, University of Medicine and Pharmacy, 540139 Tirgu Mures, Romania.
authors: Zoltan
authors: Z
authors: Kadar
authors: Simona Gurzu, Zoltan Kadar, Adrian Tamasi, Ioan Jung, Department of Pathology, University of Medicine and Pharmacy, 540139 Tirgu Mures, Romania.
authors: Tivadar
authors: T
authors: Bara
authors: Simona Gurzu, Zoltan Kadar, Adrian Tamasi, Ioan Jung, Department of Pathology, University of Medicine and Pharmacy, 540139 Tirgu Mures, Romania.
authors: Tivadar
authors: T
authors: Bara
authors: Simona Gurzu, Zoltan Kadar, Adrian Tamasi, Ioan Jung, Department of Pathology, University of Medicine and Pharmacy, 540139 Tirgu Mures, Romania.
authors: Adrian
authors: A
authors: Tamasi
authors: Simona Gurzu, Zoltan Kadar, Adrian Tamasi, Ioan Jung, Department of Pathology, University of Medicine and Pharmacy, 540139 Tirgu Mures, Romania.
authors: Leonard
authors: L
authors: Azamfirei
authors: Simona Gurzu, Zoltan Kadar, Adrian Tamasi, Ioan Jung, Department of Pathology, University of Medicine and Pharmacy, 540139 Tirgu Mures, Romania.
authors: Ioan
authors: I
authors: Jung
mesh_terms: D000230:Adenocarcinoma / Q000737:chemistry / Q000235:genetics / Q000473:pathology* / Q000556:secondary / Q000601:surgery; D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis / Q000235:genetics; D001706:Biopsy; D018278:Carcinoma, Neuroendocrine / Q000737:chemistry / Q000235:genetics / Q000473:pathology* / Q000556:secondary / Q000601:surgery; D002430:Cecal Neoplasms / Q000737:chemistry / Q000235:genetics / Q000473:pathology* / Q000601:surgery; D002454:Cell Differentiation; D003082:Colectomy; D005260:Female; D005743:Gastrectomy; D006801:Humans; D007150:Immunohistochemistry; D008197:Lymph Node Excision; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D018193:Neoplasms, Complex and Mixed / Q000737:chemistry / Q000235:genetics / Q000473:pathology* / Q000556:secondary / Q000601:surgery; D013274:Stomach Neoplasms / Q000737:chemistry / Q000235:genetics / Q000473:pathology* / Q000601:surgery; D016896:Treatment Outcome
chemical_list: D014408:Biomarkers, Tumor
keywords: Carcinoembryonic antigen; Cecum; Colorectal; Composite tumor; Keratin 20; Keratin 7; Maspin; Mixed adenoneuroendocrine carcinoma; Mixed tumor; Stomach
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