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• W2067120288 abstract "Distinguishing primary ovarian carcinoma, particularly endometrioid and mucinous subtypes, from metastatic colorectal carcinoma to the ovary is often difficult on histologic examination alone. Recently, three immunohistochemical markers CDX2, a homeobox gene encoding an intestine-specific transcription factor; α-methylacyl-CoA racemase (AMACR/P504S), a mitochondrial and peroxisomal enzyme with fairly restricted expression in selective tumors and β-catenin, an adenomatous polyposis coli (APC) mutation product resulting in activation of the Wnt pathway, have been reported to have specific and sensitive expression in colorectal carcinomas. We evaluated a panel consisting of antibodies to CDX2, β-catenin and P504S in 23 primary ovarian adenocarcinomas (13 mucinous and 10 endometrioid) and compared the findings to 22 metastatic colorectal adenocarcinomas (seven mucinous and 15 nonmucinous tumors with endometrioid-like morphology hereafter referred to as pseudo-endometrioid) to the ovary stained with the same panel. Twenty (91%) metastatic tumors expressed at least two markers and seven (32%) expressed all three. In contrast, only three (13%) primary ovarian tumors expressed at least two markers and none expressed all three. Strong (2+, 3+) and diffuse (>40%) expression for CDX2 was noted in 21 (95%) metastatic tumors and five (22%) primary ovarian tumors (three mucinous, two endometrioid). P504S was similarly expressed in seven (32%) metastatic and none of the primary ovarian carcinomas. Nuclear expression of β-catenin was noted in 13 (59%) metastatic tumors and in eight cases (36%), it was diffuse and strong. In contrast, four (19%) primary tumors showed nuclear expression of this protein with only one (5%) case expressing it in a diffuse pattern. Immunohistochemical expression of gene products and enzymes of colorectal carcinogenesis in some primary ovarian carcinomas suggest that the morphologic similarities between colorectal and mucinous/endometrioid carcinoma of the ovary extends to the genetic level, although differences in the level of expression exist between these tumors. Diffuse expression of all three markers (CDX2, β-catenin and P504S) in a tumor in the ovary was found to be virtually diagnostic of metastasis from a colorectal primary in this study." @default.
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• W2067120288 date "2005-01-01" @default.
• W2067120288 modified "2023-10-01" @default.
• W2067120288 title "Use of novel immunohistochemical markers expressed in colonic adenocarcinoma to distinguish primary ovarian tumors from metastatic colorectal carcinoma" @default.
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• W2067120288 doi "https://doi.org/10.1038/modpathol.3800260" @default.
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