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pubmed-article:16273209pubmed:abstractTextLoss of E-cadherin expression allows carcinoma cells to liberate from the primary site and enhances invasion and metastasis. The genetic aberration of E-cadherin is a rare event in sporadic carcinomas, and transcription repressors are considered to take a central role in E-cadherin loss. However, expression of E-cadherin repressors is largely dependent on tissue and cell type. To identify the repressor expressed in oral squamous carcinomas, we compared the expression levels of E-cadherin and repressors by real-time RT-PCR. Among the repressors including SNAIL, SLUG, SIP1, E12 and E47, SIP1 was inversely correlated to E-cadherin (P < 0.05). Chromatin immunoprecipitation showed that SIP1 specifically bound to the E-cadherin promoter region. SIP1 expression was immuno-histochemically detected in 27.7% of 47 oral carcinomas, and SIP1-positive carcinomas did not express E-cadherin (P < 0.01). Thirteen patients with SIP1 staining showed a lower disease-specific survival rate (P < 0.05). Multivariate risk factor analysis demonstrated that SIP1 expression was an independent prognostic value for disease-specific overall survival (P < 0.05). These results suggest that SIP1 contributes to the loss of E-cadherin expression and that detection of SIP1 expression is a predictive and prognostic tool in clinical management of oral carcinomas.lld:pubmed
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pubmed-article:16273209pubmed:articleTitleExpression of SIP1 in oral squamous cell carcinomas: implications for E-cadherin expression and tumor progression.lld:pubmed
pubmed-article:16273209pubmed:affiliationDepartment of Biochemistry, School of Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan.lld:pubmed
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