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• W2122082672 abstract "Recent genetic investigations of nephroblastomas point to an activation of the Wnt pathway. Data indicate however that activation might be partly due to cross talk of different signaling pathways including the tumor suppressor gene PTEN (phosphatase and tensin homolog on chromosome 10). Therefore, we examined expression and chromosomal aberrations of PTEN in nephroblastomas of different subtypes and the corresponding nephrogenic rests. Loss of heterozygosity was analyzed by high-resolution melting analysis of 4 different single nucleotide polymorphisms. Results were confirmed by sequence analysis of the polymerase chain reaction products. In addition, an intragenic insertion-deletion polymorphism of the PTEN gene was investigated. Protein expression was assessed by immunohistochemistry. Twenty-two nephroblastomas and their corresponding nephrogenic rests were included in the study. In the high-resolution melting analysis, 15 samples were homozygous, 6 were heterozygous, and for 1 sample results could not be obtained for technical reasons. None of the samples showed loss of heterozygosity. Nineteen of the tumors and corresponding nephrogenic rests were also examined immunohistochemically. All tumors showed cytoplasmic positivity, with the exception of 1 tumor that showed complete loss of staining. In 1 tumor, the epithelial component showed distinct cytoplasmic staining, whereas the immature muscle and hyaline cartilage were negative. All nephrogenic rests exhibited positive cytoplasmic staining of all components. Our results establish that inactivation of PTEN is a rare and late event in the pathogenesis of nephroblastomas." @default.
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• W2122082672 date "2010-08-01" @default.
• W2122082672 modified "2023-09-23" @default.
• W2122082672 title "Loss of PTEN/MMAC1 activity is a rare and late event in the pathogenesis of nephroblastomas" @default.
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• W2122082672 doi "https://doi.org/10.1016/j.humpath.2009.10.024" @default.
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