Aberrations of breast cancer susceptibility genes occur early in sporadic breast tumors and in acquisition of breast epithelial immortalization

Genes, Chromosomes & Cancer
Zhen Hang MengShanaz H Dairkee

Abstract

In the search for early deletion targets in sporadic breast cancer, the analysis of TP53, BRCA1, BRCA2, and ATM revealed loss of heterozygosity (LOH) in tumor cells at 1 or more genes in 18 of 24 cases examined. Notably, in more than 60% of such tumors, LOH was detectable in morphologically normal terminal ductal lobular units (TDLUs) adjacent to carcinoma (LOHint). At BRCA2 and ATM, LOHint was most frequent, particularly in TDLUs of women <or= 50 years old (7 of 10). In a novel preneoplastic model system, declining expression levels observed with increasing passage in culture supported the postulate that during the acquisition of continuous growth, elimination of these genes at an early stage confers a distinct selective advantage. The intimate role of these genes in DNA repair and their early deletion has implications for the possible transforming effects of DNA-damaging agents on unexcised breast tissue harboring LOHint within breast cancer patients.

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Citations

Sep 8, 2005·Journal of the National Cancer Institute·Afshin RaoufConnie J Eaves
Oct 1, 2008·Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology·Andrew D SpearmanAmanda Ewart Toland
Jul 26, 2011·Pathology Research International·Aejaz NasirTimothy J Yeatman
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Mar 30, 2010·Free Radical Biology & Medicine·George SigounasJohn E Wiley
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Oct 26, 2005·Cancer Letters·Alex Lyakhovich, Jordi Surralles
Aug 2, 2006·British Journal of Cancer·C L ClarkeS R Lakhani
Jun 3, 2021·Genes·Luigia Stefania StucciCamillo Porta

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