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• W2399648506 abstract "To study how to identify patients with triple negative sporadic breast cancers (BCs) having BRCA1 silenced or down-regulated due to epigenetic BRCA1 inactivation.We selected, from our database, patients diagnosed with BC between 1995 and 2001 with tumors exhibiting the triple negative phenotype. Triple positive tumors were used as controls. BRCA1 protein expression was determined by immunohistochemistry. Methylation specific polymerase chain reaction (PCR) and bisulfite sequencing on genomic DNA were used to assess BRCA1 promoter methylation. BRCA1 m-RNA expression analysis was conducted by real-time PCR.Forty-four triple negative and 68 controls (triple positive) were eligible for our analysis. BRCA1 promoter methylation was present in 31.8% of triple negative and in 20.6% of triple positive cases. BRCA1 was inactivated (absent BRCA1 m-RNA expression and lack of BRCA1 protein) in 21.4% of tumors with BRCA1 promoter methylation, as compared with 6% of non-methylated ones (p = 0.0453).BRCA1 inactivation due to promoter methylation could play an important role in some sporadic BC cases. Patients with this signature could represent the basis for prospective studies aiming to compare clinical response to different drugs." @default.
• W2399648506 created "2016-06-24" @default.
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• W2399648506 date "2010-02-01" @default.
• W2399648506 modified "2023-09-26" @default.
• W2399648506 title "BRCA1 expression in triple negative sporadic breast cancers." @default.
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• W2399648506 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20701084" @default.
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