Abstract
Background
Prostate cancer (PrCA) incidence in South Carolina (SC) exceeds the national average, particularly among African Americans (AAs). Though data are limited, low environmental zinc exposures and down-regulation of prostatic zinc transporter proteins among AAs may explain, in part, the racial PrCA disparity.
Methods
Age-adjusted PrCA rates were calculated by census tract. Demographic data were obtained from the 1990 census. Hazardous waste site locations and soil zinc concentrations were obtained from existing federal and state databases. A geographic information system and Poisson regression were used to test the hypothesis that census tracts with reduced soil zinc concentrations, elevated groundwater use, or more agricultural or hazardous waste sites had elevated PrCA risks.
Results
Census tracts with high groundwater use and low zinc concentrations had higher PrCA rate ratios (RR: 1.270; 95% confidence interval: 1.079, 1.505). This effect was not more apparent in areas populated primarily by AAs.
Conclusion
Increased PrCA rates were associated with reduced soil zinc concentrations and elevated groundwater use, although this observation is not likely to contribute to SC’s racial PrCA disparity. Statewide mapping and statistical modeling of relationships between environmental factors, demographics, and cancer incidence can be used to screen hypotheses focusing on novel PrCA risk factors.
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Abbreviations
- PrCA:
-
Prostate cancer
- SC:
-
South Carolina
- AA:
-
African-American
- EA:
-
European-American
- PSA:
-
Prostate-specific antigen
- GIS:
-
Geographic information system
- RR:
-
Rate ratio
- SCCCR:
-
South Carolina Central Cancer Registry
- DHEC:
-
Department of Health and Environmental Control
- USGS:
-
United States Geological Survey
- CERCLA:
-
Comprehensive Environmental Response, Compensation, and Liability Act
- EPA:
-
Environmental Protection Agency
- ppm:
-
Parts per million
- ICP:
-
Inductively coupled plasma
- SIR:
-
Standardized incidence ratio
- CI:
-
Confidence interval
- CAR:
-
Conditional autoregressive
- MCMC:
-
Markov chain Monte Carlo
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Acknowledgments
Research Career Development Award, Department of Veteran’s Affairs VISN-7, Charleston, South Carolina to J. B. B.; National Cancer Institute, Community Networks Program (1 U01 CA114601-01 to J. R. H.).
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Wagner, S.E., Burch, J.B., Hussey, J. et al. Soil zinc content, groundwater usage, and prostate cancer incidence in South Carolina. Cancer Causes Control 20, 345–353 (2009). https://doi.org/10.1007/s10552-008-9248-0
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DOI: https://doi.org/10.1007/s10552-008-9248-0