Methylation Differences in Head and Neck Cancer
Author Information
Author(s): Hennessey Patrick T., Ochs Michael F., Mydlarz Wojciech W., Hsueh Wayne, Cope Leslie, Yu Wayne, Califano Joseph A.
Primary Institution: Johns Hopkins Medical Institutions
Hypothesis
Are tumor-derived xenografts more accurate representations of promoter methylation in primary tumors compared to cancer cell lines?
Conclusion
Tumor-derived xenografts closely resemble primary tumors in promoter methylation patterns, while cancer cell lines show significant differences.
Supporting Evidence
- Over 2,200 significant methylation differences were found between cancer cell lines and primary tumors.
- No significant methylation differences were observed between primary tumor xenografts and primary tumors.
- Xenografts provide a more accurate model for studying methylation in cancer than cell lines.
Takeaway
This study found that tumors grown in mice (xenografts) have similar DNA changes to the original tumors, while cancer cells grown in labs do not.
Methodology
DNA from primary tumors, xenografts, and cell lines was analyzed using genome-wide methylation microarrays.
Potential Biases
Potential bias due to the differences in tissue culture environments affecting methylation.
Limitations
The sample size was relatively small, which may limit the generalizability of the findings.
Participant Demographics
Patients undergoing surgery for head and neck squamous cell carcinoma.
Statistical Information
P-Value
2×10−5
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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