Abstract
Genomic instability in breast cancer results in low-level changes in DNA copy number, a significant but poorly understood mechanism underlying the genetic heterogeneity of this disorder. Two different approaches, loss of heterozygosity (LOH) and comparative genomic hybridization (CGH), have been used to probe the genetics of breast cancer evolution. LOH is a locus specific method that detects the variation in the parental origin of DNA, but is not quantitative. CGH provides a genome-wide accounting of the magnitude of DNA copy number changes, but not parental origin. Both methods have identified complex and heterogeneous patterns of DNA losses, duplications, and amplifications during breast cancer evolution. LOH and CGH technologies interrogate very distinct mechanisms driving breast tumor evolution, yet are seldom used in parallel to profile specimens. Thus, the relative significance of genetic versus numerical variations of DNA in breast cancer evolution remains undefined. This review will attempt to summarize some of the successes of these investigations, highlight some complex and confounding observations emerging from these studies, and discuss the potential of these studies to improve our understanding of breast cancer biology and treatment.
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O‘Connell, P. Genetic and Cytogenetic Analyses of Breast Cancer Yield Different Perspectives of a Complex Disease. Breast Cancer Res Treat 78, 347–357 (2003). https://doi.org/10.1023/A:1023037925950
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DOI: https://doi.org/10.1023/A:1023037925950