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Mitochondrion-rich differentiated adenocarcinomas of the stomach: clinicopathological, immunohistochemical and electron microscopy study of nine cases

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Abstract

Pathologic and prognostic data of nine patients with mitochondrion-rich carcinomas (MRC) were compared retrospectively to data of 101 patients with conventional gastric adenocarcinomas. MRC was defined as a tumour composed predominantly, or entirely, of columnar adenocarcinoma cells with eosinophilic cytoplasm and a strong supranuclear immunoreactivity for antimitocondrial antibody. Electron microscopy confirmed supranuclear distribution of mitochondria in MRC while immunostaining pattern was irregular or absent in the remaining 101 cases. MRC exhibited a tubulopapillary or cribriform growth pattern with focal infiltration of neutrophils in the tumour stroma. Prominent necrosis was present including segmental and intraluminal “dirty necrosis”, while mitotic and ki-67 proliferative rates were low. MRC showed immunohistochemical findings compatible with gastric differentiation (CK7+/CK20/CDX).When MRC were compared with non-MRC carcinomas, tumour size (<4 cm vs >4 cm, P < 0.01), frequency of lymph node metastases (11% vs. 80%, P < 0.01), low stage (I, II) at diagnosis (100% vs. 56%, P < 0.01), Goseki’s group I (100% vs. 6%, P < 0.01), and better survival (0% vs. 70%, P < 0.01) differed significantly. Our results suggest that MRC of the stomach may be considered a low-grade malignancy with an excellent prognosis.

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Correspondence to Rosario A. Caruso.

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Caruso, R.A., Napoli, P., Nania, A. et al. Mitochondrion-rich differentiated adenocarcinomas of the stomach: clinicopathological, immunohistochemical and electron microscopy study of nine cases. Virchows Arch 456, 499–505 (2010). https://doi.org/10.1007/s00428-010-0912-x

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  • DOI: https://doi.org/10.1007/s00428-010-0912-x

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