BACKGROUND: Genome-wide association studies (GWAS) have identified numerous common SNPs associated with prostate cancer (CaP) risk in men of European descent. This study evaluates GWAS SNPs associated with CaP in African Americans (AAs) and European Americans (EA). METHODS: Eight hundred SNPs were genotyped, including 32 from European-based GWAS and 35 flanking SNPs, in 417 AA and 455 EA cases from the NC-LA Prostate Cancer Project (PCaP) and compared to 925 AA and 1,687 EA controls from Illumina's iControlDB. The 32 GWAS SNPs were evaluated for their predictive power to discriminate between cases and controls using ROC curves. RESULTS: Of the 32 GWAS SNPs, 13 were significant at P < 0.05 in EA and 4 in AA (rs6983267, rs7017300, rs1859962, rs6501455). Three of 35 flanking SNPs, all from chromosome 8q, reached study-wide significance (P < 3.5 × 10(-5)); 2 in AA (rs10505476 rs6985504) and 1 in EA (rs16901970). Among the remaining 656 SNPs, 2 were associated with CaP (P < 3.5 × 10(-5)): rs1472606 (OR: 1.43 in EA) and rs9351265 (OR: 1.48 in AA) both in intergenic regions. For the 32 GWAS SNPs, ROC plots yielded AUC estimates too low for clinical use (EA AUC = 0.60 and AA AUC = 0.56). CONCLUSIONS: This study confirms a large proportion of CaP associated regions implicated by European-based GWAS and provides evidence that some regions may be important in AA CaP risk. Despite the identification of a large panel of GWAS replicated SNPs for CaP, this panel is not appropriate for clinical screening.
BACKGROUND: Genome-wide association studies (GWAS) have identified numerous common SNPs associated with prostate cancer (CaP) risk in men of European descent. This study evaluates GWAS SNPs associated with CaP in African Americans (AAs) and European Americans (EA). METHODS: Eight hundred SNPs were genotyped, including 32 from European-based GWAS and 35 flanking SNPs, in 417 AA and 455 EA cases from the NC-LA Prostate Cancer Project (PCaP) and compared to 925 AA and 1,687 EA controls from Illumina's iControlDB. The 32 GWAS SNPs were evaluated for their predictive power to discriminate between cases and controls using ROC curves. RESULTS: Of the 32 GWAS SNPs, 13 were significant at P < 0.05 in EA and 4 in AA (rs6983267, rs7017300, rs1859962, rs6501455). Three of 35 flanking SNPs, all from chromosome 8q, reached study-wide significance (P < 3.5 × 10(-5)); 2 in AA (rs10505476rs6985504) and 1 in EA (rs16901970). Among the remaining 656 SNPs, 2 were associated with CaP (P < 3.5 × 10(-5)): rs1472606 (OR: 1.43 in EA) and rs9351265 (OR: 1.48 in AA) both in intergenic regions. For the 32 GWAS SNPs, ROC plots yielded AUC estimates too low for clinical use (EA AUC = 0.60 and AA AUC = 0.56). CONCLUSIONS: This study confirms a large proportion of CaP associated regions implicated by European-based GWAS and provides evidence that some regions may be important in AA CaP risk. Despite the identification of a large panel of GWAS replicated SNPs for CaP, this panel is not appropriate for clinical screening.
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