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Molecular subtypes of breast cancer are associated with characteristic DNA methylation patterns

Open access
Holm, Karolina, Hegardt, Cecilia, Staaf, Johan, Vallon-Christersson, Johan, Jönsson, Göran, Olsson, Håkan, Borg, Åke, Ringnér, Markus·2010·Breast Cancer Research

Abstract

Introduction: Five different molecular subtypes of breast cancer have been identified through gene expression profiling. Each subtype has a characteristic expression pattern suggested to partly depend on cellular origin. We aimed to investigate whether the molecular subtypes also display distinct methylation profiles. Methods: We analysed methylation status of 807 cancer-related genes in 189 fresh frozen primary breast tumours and four normal breast tissue samples using an array-based methylation assay. Results: Unsupervised analysis revealed three groups of breast cancer with characteristic methylation patterns. The three groups were associated with the luminal A, luminal B and basal-like molecular subtypes of breast cancer, respectively, whereas cancers of the HER2-enriched and normal-like subtypes were distributed among the three groups. The methylation frequencies were significantly different between subtypes, with luminal B and basal-like tumours being most and least frequently methylated, respectively. Moreover, targets of the polycomb repressor complex in breast cancer and embryonic stem cells were more methylated in luminal B tumours than in other tumours. BRCA2-mutated tumours had a particularly high degree of methylation. Finally, by utilizing gene expression data, we observed that a large fraction of genes reported as having subtype-specific expression patterns might be regulated through methylation. Conclusions: We have found that breast cancers of the basal-like, luminal A and luminal B molecular subtypes harbour specific methylation profiles. Our results suggest that methylation may play an important role in the development of breast cancers.

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Metadata

Authors
Holm, K., Hegardt, C., Staaf, J., Vallon-Christersson, J., Jönsson, G., Olsson, H., Borg, Å., & Ringnér, M.
Venue
Breast Cancer Research
Published
2010-06-18
Volume
12
Issue
3
Pages
R36-R36
ISSN
  • 1465-5411 (ISSN-L)
  • 1465-542X
OpenAlex
W2147944526
Cited by
309
References
9
FWCI
9.10
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: Molecular subtypes of breast cancer are associated with characteristic DNA methylation patterns. https://app.cochat.ai/papers/10.1186/bcr2590
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Holm, K., Hegardt, C., Staaf, J., Vallon-Christersson, J., Jönsson, G., Olsson, H., Borg, Å., & Ringnér, M. (2010). Molecular subtypes of breast cancer are associated with characteristic DNA methylation patterns. Breast Cancer Research. https://doi.org/10.1186/bcr2590

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