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• W2157061569 abstract "Allelotype analysis of whole chromosomes showed that loss of heterozygosity (LOH) on 13q was exclusively associated with lymph node metastasis and poor prognosis in esophageal squamous cell carcinoma (ESC). To identify a locus responsible for lymph node metastasis, we performed fine deletion mapping on 13q by analyzing 60 ESCs with 18 polymorphic markers. Allelic loss was observed with at least one marker in 34 tumors (56.7%), and lymph node metastasis was significantly correlated with LOH (P = 0.0053). We found frequent loss at D13S260 (43.7%), D13S171 (38.6%), and D13S267 (43.6%) on 13q12-13. Among these markers, LOH at D13S171 showed a significant correlation with lymph node metastasis (P = 0.0441). Because these markers flank the BRCA2 gene, we intensively examined a mutation of the gene through all coding exons and exon-intron junctions by PCR-single-strand conformational polymorphism analysis under two different assays. We found only seven nucleotide substitutions as normal polymorphic changes; tumor-specific mutations were not detected, and loss of expression was not observed, indicating that the BRCA2 gene might not be a target of allelic loss in this region. Relatively frequent LOH was also found at the RB1 locus (34.7%), but a significant correlation with lymph node metastasis was not observed (P = 0.7430). Protein expression of RB1 was examined in 31 ESC cell lines, and loss of expression was infrequent (6.5%), indicating that inactivation of the RB1 gene might not be responsible for lymph node metastasis. Taken together, allelic loss at 13q12-13 of the primary ESC was closely associated with lymph node metastasis, and unidentified tumor suppressor gene(s) in this region might be involved." @default.
• W2157061569 created "2016-06-24" @default.
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• W2157061569 date "1999-08-01" @default.
• W2157061569 modified "2023-10-01" @default.
• W2157061569 title "Lymph node metastasis is associated with allelic loss on chromosome 13q12-13 in esophageal squamous cell carcinoma." @default.
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• W2157061569 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10446988" @default.
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