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Germline Brca2 heterozygosity promotes Kras(G12D) -driven carcinogenesis in a murine model of familial pancreatic cancer

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Authors
Skoulidis, Ferdinandos
Cassidy, Liam D
Pisupati, Venkat
Jonasson, Jon G
Bjarnason, Hordur
Eyfjord, Jorunn E
Karreth, Florian A
Lim, Michael
Barber, Lorraine M
Clatworthy, Susan A
Davies, Susan E
Olive, Kenneth P
Tuveson, David A
Venkitaraman, Ashok R
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Issue Date
2010-11-16

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Citation
Cancer Cell. 2010, 18(5):499-509
Abstract
Inherited heterozygous BRCA2 mutations predispose carriers to tissue-specific cancers, but somatic deletion of the wild-type allele is considered essential for carcinogenesis. We find in a murine model of familial pancreatic cancer that germline heterozygosity for a pathogenic Brca2 truncation suffices to promote pancreatic ductal adenocarcinomas (PDACs) driven by Kras(G12D), irrespective of Trp53 status. Unexpectedly, tumor cells retain a functional Brca2 allele. Correspondingly, three out of four PDACs from patients inheriting BRCA2(999del5) did not exhibit loss-of-heterozygosity (LOH). Three tumors from these patients displaying LOH were acinar carcinomas, which also developed only in mice with biallelic Brca2 inactivation. We suggest a revised model for tumor suppression by BRCA2 with implications for the therapeutic strategy targeting BRCA2 mutant cancer cells.
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http://dx.doi.org/10.1016/j.ccr.2010.10.015
ae974a485f413a2113503eed53cd6c53
10.1016/j.ccr.2010.10.015
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