Genetic Changes in Breast Cancer from Nuclear Fallout Areas
Author Information
Author(s): Varma G, Varma R, Huang H, Pryshchepava A, Groth J, Fleming D, Nowak N J, McQuaid D, Conroy J, Mahoney M, Moysich K, Falkner K L, Geradts J
Primary Institution: Roswell Park Cancer Institute
Hypothesis
Are there distinct genetic changes in premenopausal breast cancers from areas exposed to nuclear fallout compared to those from non-exposed areas?
Conclusion
The study identified a distinct profile of genetic aberrations in breast cancers from a nuclear fallout area, suggesting a possible molecular fingerprint of radiation-associated breast cancer.
Supporting Evidence
- The average number of total CNAs per sample was 76, indicating significant genetic changes.
- Belarussian tumours had more amplifications and fewer deletions than WNY breast cancers.
- Unsupervised hierarchical clustering revealed two distinct groups of tumours based on geographic origin.
- 50 CNAs occurred significantly more commonly in one cohort versus the other.
- Some candidate signature amplifications were identified in breast cancers from women exposed to significant radiation.
Takeaway
Scientists looked at breast cancer samples from women who lived near a nuclear disaster and found many unique genetic changes compared to samples from women who didn't have that exposure.
Methodology
High-resolution array comparative genomic hybridisation (aCGH) was used to analyze DNA copy number aberrations in breast cancer samples.
Potential Biases
Potential confounding factors such as smoking or diet were not ruled out.
Limitations
The study did not have associated epidemiologic or dosimetry data for individual samples from Belarus.
Participant Demographics
Participants included premenopausal women from Belarus and Western New York, primarily Caucasian, with ages ranging from 24 to 50 years.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website