Genomic Similarities in Synchronous Breast Cancer Tumors
Author Information
Author(s): Brommesson Sara, Jönsson Göran, Strand Carina, Grabau Dorthe, Malmström Per, Ringnér Markus, Fernö Mårten, Hedenfalk Ingrid
Primary Institution: Lund University
Hypothesis
Do synchronous unilateral and bilateral breast cancer tumors arise from clonal expansion or represent independent primary tumors?
Conclusion
Synchronous unilateral tumor pairs are often genomically similar, while synchronous bilateral tumors most often represent individual primary tumors.
Supporting Evidence
- Five of ten unilateral tumor pairs displayed similar genomic profiles.
- Only one of eight bilateral tumor pairs displayed pair-wise genomic similarities.
- DNA index, histological type, and presence of vessel invasion correlated with genomic analyses.
Takeaway
This study looked at breast cancer tumors that appeared at the same time to see if they were related or separate. It found that tumors on the same side are usually related, while those on different sides are often separate.
Methodology
The study used 32 K tiling microarray-based comparative genomic hybridization (aCGH) to explore genomic similarities among tumor pairs.
Potential Biases
Potential bias due to the selection of patients from a single institution.
Limitations
The study was limited by the small sample size and the retrospective nature of the data collection.
Participant Demographics
Patients diagnosed with synchronous unilateral or bilateral breast tumors between 1987 and 2006.
Statistical Information
P-Value
1.9 × 10-5
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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