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• W2030234723 endingPage "191" @default.
• W2030234723 startingPage "183" @default.
• W2030234723 abstract "The p53 tumor suppressor gene is altered in approximately half of human cancers. Although p53 mutations are common in invasive breast carcinoma, few have been identified in breast carcinoma in situ (intraductal breast carcinomas). Most studies of p53 in breast carcinoma in situ are immunohistochemical studies of p53 staining in paraffin-embedded tissue sections. Few studies have isolated the tumor cells and subjected them to DNA sequence analysis. The current study was undertaken to characterize p53 in a cohort of breast carcinoma in situ cases, both with and without invasive disease. Fifty-eight frozen breast biopsy samples were used for these investigations. Twenty-seven cases had only ductal carcinoma in situ (CIS) and 31 cases had evidence of both invasive and in situ carcinoma. DNA sequence alterations in exons 2 through 11 of p53 were screened by the single-strand conformational polymorphism technique. Exons with altered mobility were sequenced. Among breast CIS cases without invasive disease, 22% had p53 mutations and 7% had DNA sequence alterations of unknown significance. Analysis of breast CIS with concurrent invasive disease demonstrated p53 mutations in 19% of cases and one (3%) DNA alteration of unknown significance. Each carcinoma having a p53 mutation in the breast CIS component had the identical mutation in the invasive component of the same tumor indicating a clonal relationship between the two tumor components. p53 protein overexpression was identified in 22% of pure intraductal breast carcinomas and in 35% of breast CIS with invasive disease. Comparison of immunostaining and DNA sequence alterations showed a significant association between overexpression and mutations (P = 0. 0037) in cases of CIS without invasion, and similarly between overexpression and mutations in cases of CIS with invasion (P = 0. 007). p53 mutations and p53 overexpression were relatively common in intraductal breast carcinomas but were not observed in adjacent normal breast lobules or ducts in 9 cases available for DNA analysis. The frequency of p53 alterations when comparing breast CIS with and without an invasive component indicated that p53 mutations usually occur before invasion during the progression of breast cancer, as is observed for a number of other adult solid tumors." @default.
• W2030234723 created "2016-06-24" @default.
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• W2030234723 date "2000-01-01" @default.
• W2030234723 modified "2023-10-16" @default.
• W2030234723 title "p53 Mutations and Expression in Breast Carcinoma in Situ" @default.
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• W2030234723 doi "https://doi.org/10.1016/s0002-9440(10)64718-9" @default.
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