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• W2098739456 abstract "Abstract Purpose: The importance of the BRCA gene products in maintaining genomic stability led us to hypothesize that BRCA-associated and sporadic ovarian cancers would have distinctive genetic profiles despite similarities in histologic appearance. Experimental Design: A whole-genome copy number analysis of fresh, frozen, papillary serous ovarian cancer DNA was done using the Affymetrix 50K Xba Mapping Array using each patient's normal genomic DNA as the matched control. Loss of heterozygosity and copy number abnormalities were summarized to define regions of amplification, deletion, or uniparental disomy (UPD), defined as loss of one allele and duplication of the remaining allele. Genomic abnormalities were compared between BRCA-associated and sporadic tumors. Results: We compared 6 BRCA-associated with 14 sporadic papillary serous ovarian carcinomas. Genetic instability, measured by percentage of genome altered, was more pronounced in BRCA-associated tumors (median, 86.6%; range, 54-100%) than sporadic tumors (median, 43.6%; range, 2-83%; P = 0.009). We used frequency plots to show the proportion of cases affected by each type abnormality at each genomic region. BRCA-associated tumors showed genome-wide loss of heterozygosity primarily due to the occurrence of UPD rather than deletion. UPD was found in 100% of the BRCA-associated and 50% of the sporadic tumors profiled. Conclusions: This study reports on a previously underappreciated genetic phenomenon of UPD, which occurs frequently in ovarian cancer DNA. We observed distinct genetic patterns between BRCA-associated and sporadic ovarian cancers, suggesting that these papillary serous tumors arise from different molecular pathways." @default.
• W2098739456 created "2016-06-24" @default.
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• W2098739456 date "2008-12-01" @default.
• W2098739456 modified "2023-10-18" @default.
• W2098739456 title "Genome-Wide Loss of Heterozygosity and Uniparental Disomy in BRCA1/2-Associated Ovarian Carcinomas" @default.
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• W2098739456 doi "https://doi.org/10.1158/1078-0432.ccr-08-1291" @default.
• W2098739456 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2677417" @default.
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