Abstract
We evaluated the characteristics of nasopharyngeal carcinoma in Korea, including its clinical, pathologic, and molecular features, especially emphasizing on the EBV strains involved, latent membrane protein 1 (LMP1) expression, and the alterations of matrix metalloproteinase 9 (MMP9) and E-cadherin expression. METHODS.: The presence of EBV was evaluated by EBER in situ hybridization, and the expression of LMP1, MMP9, and E-cadherin by immunohistochemistry. The characterization of EBV type and LMP1 variant was performed by PCR. EBER was detected in 55 of 57 cases (96%) of nonkeratinizing carcinoma (NKC) and undifferentiated carcinoma, but in only four of nine cases (44%) of squamous cell carcinoma (SCC). EBER positivity was much higher in the group with nodal metastases (p =.003). The predominant strain of EBV infection was type A (81%) and a 30-bp deletion LMP1 variant (77%). All EBER-positive SCCs were infected with EBV type A. LMP1 expression was detected in 36 of 59 (61%) patients with latent EBV infection and MMP9 in 41 of these 59 (69%). LMP1 positivity was much higher among the patients aged 50 years and younger. MMP9 expression was associated with LMP1 expression (p =.008), and nodal and distant metastasis (p =.019, p =....Continue Reading
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