Biliary lymphoepithelioma-like carcinoma not associated with Epstein-Barr virus.
ABSTRACT We report the case of a 64-year-old man who presented with a hepatic mass and macronodular cirrhosis. The pathologic findings revealed a lymphoepithelioma-like carcinoma arising in the hepatobiliary tract that was morphologically identical to nasopharyngeal undifferentiated carcinoma. However, this tumor was not associated with Epstein-Barr virus infection in molecular studies. Macronodular cirrhosis associated with hepatitis C virus was present in the background liver.
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ABSTRACT: Primary lymphoepithelioma-like carcinomas (LELC) of the hepatobiliary tract are quite rare and the majority are associated with the Epstein-Barr virus (EBV). Here we report an unusual case of intrahepatic cholangiocarcinoma (ICC), admixed with LELC in a 63 year-old Filipino woman who presented clinically with right flank and back pain. Histologically, the tumor showed a dense lymphocytic infiltrate, predominantly composed of CD3 (+) T cells, and two components: an undifferentiated carcinoma, morphologically similar to nasopharyngeal carcinoma, and a poorly differentiated ICC intimately admixed. Immunohistochemical studies revealed that both components were immunoreactive for AE1/AE3, cytokeratin 7 and, focally, for monoclonal CEA. Both components were negative for cytokeratin 20 and HePar 1. EBER-1 in situ hybridization was uniformly positive in the tumor cells. The presence of EBV in ICC and LELC suggests that the virus may be linked to the pathogenesis of both components of the tumor. The mechanism of virus-driven neoplastic transformation needs further study.International journal of clinical and experimental pathology 01/2010; 3(7):736-41. · 1.78 Impact Factor
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ABSTRACT: Lymphoepithelioma-like carcinomas (LELC) of the liver are rare. Only nine cases have been reported. All of them were considered to be cholangiocarcinoma and the majority were positive for Epstein-Barr virus (EBV) on EBER in situ hybridization. Here we report a case of hepatocellular carcinoma (HCC) mainly composed of LELC. The patient was a 56-year-old man with chronic hepatitis C virus (HCV) infection and cirrhosis. A right-side hepatectomy was performed to remove a 3-cm diameter tumor. Microscopically, the tumor was mainly composed of undifferentiated carcinoma with heavy lymphocytic infiltration, consistent with LELC. The tumor cells of the LELC component were focally positive for HePar 1, CK19 and CK7 and more diffusely positive (50% of tumor cells) for AE1/AE3 on immuno-histochemical study. EBER in situ hybridization was negative. This is the first confirmed case of HCC with an LELC component. In the available literature, all three cases of LELC of the liver that were negative for EBV were associated with chronic viral hepatitis and cirrhosis, suggesting a different carcinogenesis of EBV-positive LELC of the liver.Chang Gung medical journal 30(2):172-7.
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ABSTRACT: We present two cases of intrahepatic cholangiocarcinoma with lymphoepithelioma-like component. The patients included one woman and one man, aged 67 and 41 years, respectively. They presented with right upper quadrant pain and epigastralgia. Histologically, both tumors showed two distinct histological patterns with dense lymphoplasma cell infiltration. The first pattern was a well to moderately differentiated adenocarcinoma; the second component showed a feature similar to lymphoepithelioma-like carcinoma. Granulomatous reaction was noted in one case. Immunohistochemical study revealed that both tumors were immunoreactive with AE1/AE3, cytokeratin 7, and cytokeratin 19 but negative for carcinoembryonic antigen and cytokeratin 20. The stromal lymphocytes were composed of predominantly CD3(+) T cells. In situ hybridization for Epstein-Barr virus (EBV)-encoded RNA (EBER) showed positive nuclear signal in tumor cells but not in inflammatory cells in one case. The presence or absence of EBV genome was confirmed by polymerase chain reaction of LMP-1 gene in both cases. The LMP-1 gene also had a 30-bp deletion in Exon 3 as compared with the products from B95-8 cells. We further sequenced the PCR product and confirmed a 30-bp deletion between Nucleotide (nt) 168,282 and nt 168,253 corresponding to the B95-8 sequence. The clinical significance of 30-bp deletion in Exon 3 of the LMP-1 gene in lymphoepithelioma-like carcinoma of the liver warrants further investigation.Modern Pathology 06/2001; 14(5):527-32. DOI:10.1038/modpathol.3880342 · 6.36 Impact Factor