Abstract
Background
The association between secondhand smoke (SHS) exposure and bladder cancer is inconclusive. Epigenetic alterations in bladder tumors have been linked to primary cigarette smoking and could add to the biological plausibility of an association between SHS exposure and bladder cancer.
Hypothesis
SHS exposure is associated with DNA methylation in bladder tumors.
Methods
Using an array-based approach, we profiled DNA methylation from never smoking cases of incident bladder cancer. Analyses examined associations between individual loci’s methylation with SHS variables (exposure in adulthood, childhood, occupationally, and total exposure). A canonical pathway analysis was used to find pathways significantly associated with each SHS exposure type.
Results
There is a trend toward increased methylation of numerous CpG loci with increasing exposure to adulthood, occupational, and total SHS. Discrete associations between methylation extent of several CpG loci and SHS exposures demonstrated significantly increased methylation of these loci across all types of SHS exposure. CpGs with SHS-related methylation alterations were associated with genes in pathways involved in carcinogenesis, immune modulation, and immune signaling.
Interpretation
Exposures to SHS in adulthood, childhood, occupationally, and in total are each significantly associated with changes in DNA methylation of several CpG loci in bladder tumors, adding biological plausibility to SHS as a risk factor for bladder cancer.
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Acknowledgments
We would like to thank Dr. Dominique Michaud for helpful comments and suggestions for this work. This work was supported by the Flight Attendant Medical Research Institute (YCSA 052341 to C.J.M.) and the National Institutes of Health (R01CA121147, and P42ES007373 and R01CA057494).
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The authors declared no conflicts of interest and no financial disclosures.
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Wilhelm-Benartzi, C.S., Christensen, B.C., Koestler, D.C. et al. Association of secondhand smoke exposures with DNA methylation in bladder carcinomas. Cancer Causes Control 22, 1205–1213 (2011). https://doi.org/10.1007/s10552-011-9788-6
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DOI: https://doi.org/10.1007/s10552-011-9788-6