Minority Health and Health Equity Archive

Permanent URI for this collectionhttp://hdl.handle.net/1903/21769

Welcome to the Minority Health and Health Equity Archive (MHHEA), an electronic archive for digital resource materials in the fields of minority health and health disparities research and policy. It is offered as a no-charge resource to the public, academic scholars and health science researchers interested in the elimination of racial and ethnic health disparities.

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Author: search.filters.author.Chen, Wei

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    Results from a prostate cancer admixture mapping study in African-American men.
    (2009) Bock, Cathryn Hufford; Schwartz, Ann G; Ruterbusch, Julie J; Levin, Albert M; Neslund-Dudas, Christine; Land, Susan J; Wenzlaff, Angela S; Reich, David; McKeigue, Paul; Chen, Wei; Heath, Elisabeth I; Powell, Isaac J; Kittles, Rick A; Rybicki, Benjamin A
    There are considerable racial disparities in prostate cancer risk, with a 60% higher incidence rate among African-American (AA) men compared with European-American (EA) men, and a 2.4-fold higher mortality rate in AA men than in EA men. Recently, studies have implicated several African-ancestry associated prostate cancer susceptibility loci on chromosome 8q24. In the current study, we performed admixture mapping in AA men from two independent case-control studies of prostate cancer to confirm the 8q24 ancestry association and also identify other genomic regions that may harbor prostate cancer susceptibility genes. A total of 482 cases and 261 controls were genotyped for 1,509 ancestry informative markers across the genome. The mean estimated individual admixture proportions were 20% European and 80% African. The most significant observed increase in European ancestry occurred at rs2141360 on chromosome 7q31 in both the case-only (P = 0.0000035) and case-control analyses. The most significant observed increase in African ancestry across the genome occurred at a locus on chromosome 5q35 identified by SNPs rs7729084 (case-only analysis P = 0.002), and rs12474977 (case-control analysis P = 0.004), which are separated by 646 kb and were adjacent to one another on the panel. On chromosome 8, rs4367565 was associated with the greatest excess African ancestry in both the case-only and case-control analyses (case-only and case-control P = 0.02), confirming previously reported African-ancestry associations with chromosome 8q24. In conclusion, we confirmed ancestry associations on 8q24, and identified additional ancestry-associated regions potentially harboring prostate cancer susceptibility loci.
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    Association of Symptons of Depression and Obesity With Hypertension: The Bogalusa Heart Study
    (2006) Kabir, Azad Alamgir; Whelton, Paul K.; Khan, M. Muhmud; Gustat, Jeanette; Chen, Wei
    Background: There is growing evidence that symptoms of depression influence the development of cardiovascular disease. The objective of this study was to evaluate the direct and indirect relationships between symptoms of depression, body mass index (BMI), and hypertension in a biracial (African American–white) rural population. Methods: This is a cross-sectional study with 1017 study participants (aged 12 to 62 years, 60% white, and 52% women) from 561 families of the Bogalusa Heart Study. A two-stage modeling approach was used to evaluate the relationship between symptoms of depression, BMI, and hypertension. Generalized estimating equation methods (GEE) were used to account for within family correlations. Adjusted coefficients (95% confidence interval [CI]) and odds ratios (OR) were used to explore relationships. Results: Mean ( SE) BMI of the study population was 28 (7). Thirty-two percent of those studied had presumptive depression and 13.4% had hypertension. The indirect effect of a 5 unit higher symptoms of depression score was associated with a 14% (OR: 1.14; 95% CI: 1.01–1.28; P .02) higher likelihood of being hypertensive due to presence of a higher level of BMI in both whites and African Americans. The direct effect of a 5 unit higher symptoms of depression score was found to be nonsignificant (OR: 1.05; 95% CI: 0.92–1.20; P .22) in whites and significant (OR: 0.81; 95% CI: 0.68–0.95; P .004) in African Americans. Conclusions: The presence of a significant indirect effect of symptoms of depression (mediated through higher level of BMI) in both whites and African Americans suggests that BMI can be an intermediate variable linking symptoms of depression and hypertension.