Journal article
Relationship of Extreme Chromosomal Instability with Long-term Survival in a Retrospective Analysis of Primary Breast Cancer
Cancer Research UK1
University of Oxford2
St James's University Hospital3
Brigham and Women’s Hospital4
Center for Biological Sequence Analysis, Department of Systems Biology, Technical University of Denmark5
Department of Systems Biology, Technical University of Denmark6
Koblenz University of Applied Sciences7
Royal Marsden Hospital8
Background: Chromosomal instability (CIN) is thought to be associated with poor prognosis in solid tumors; however, evidence from preclinical and mouse tumor models suggest that CIN may paradoxically enhance or impair cancer cell fitness. Breast cancer prognostic expression signature sets, which reflect tumor CIN status, efficiently delineate outcome in estrogen receptor ER-positive reast cancer in contrast to ERnegative breast cancer, suggesting that the relationship of CIN with prognosis differs in these two breast cancer subtypes.
Methods: Direct assessment of CIN requires single-cell analysis methods, such as centromeric FISH, aimed at determining the variation around the modal number of two or more chromosomes within individual tumor nuclei. Here, we document the frequency of tumor CIN by dual centromeric FISH analysis in a retrospective primary breast cancer cohort of 246 patients with survival outcome.
Results: There was increased CIN and clonal eterogeneity in ER-negative compared with ER-positive breast cancer. Consistent with a negative impact of CIN on cellular fitness, extreme CIN in ER-negative breast cancer was an independent variable associated with improved long-term survival in multivariate analysis.
In contrast, a linear relationship of increasing CIN with poorer prognosis in ER-positive breast cancer was observed, using three independent measures of CIN. Conclusions: The paradoxical relationship between extreme CIN and cancer outcome in the ER-negative cohorts may explain why prognostic expression signatures, reflecting tumor CIN status, fail to predict outcome in this subgroup.
Impact: Assessment of tumor CIN status may support risk stratification in ER-negative breast cancer and requires prospective validation. Cancer Epidemiol Biomarkers Prev; 20(10); 2183–94. 2011 AACR
Language: | English |
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Publisher: | American Association for Cancer Research |
Year: | 2011 |
Pages: | 2184-2197 |
ISSN: | 15387755 and 10559965 |
Types: | Journal article |
DOI: | 10.1158/1055-9965.EPI-11-0343 |
ORCIDs: | Eklund, Aron Charles |
Aneuploidy Biomarkers, Tumor Breast Neoplasms Breast cancer CIN Chromosomal Instability Chromosomal instability Clonal heterogeneity Comparative Genomic Hybridization ER-negative Female Fluorescence in-situ hybridisation Follow-Up Studies Gene Expression Profiling Humans In Situ Hybridization, Fluorescence Middle Aged Neoplasm Grading Oligonucleotide Array Sequence Analysis Polymorphism, Single Nucleotide Prognosis Receptors, Estrogen Retrospective Studies Survival Rate