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Prostate cancer (PCa) is one of the most common cancers in the world. Inflammation has been described as a risk factor for PCa and depends on the production of cytokines in response to tissue damage or the presence of stimuli that induces cellular stress. Interindividual variation in cytokine production is partially controlled by single-nucleotide polymorphisms (SNPs) that have been associated with differential production of cytokines. We have recently showed that SNP–SNP interactions of cytokine genes are associated with PCa risk. However, little is known about the association of cytokine SNPs and PCa aggressiveness. In this study, we evaluated the association of 15 SNPs in five cytokine genes and aggressiveness of PCa in African- and Caucasian-American individuals. Caucasian Americans with the genotypesIL10−1082GGorIL1B+3954TThad 2.31-fold [95% confidence interval (CI) = 1.13–4.72] and 3.11 (95% CI = 1.20–8.06)-fold risk, respectively, of developing aggressive PCa, as compared with individuals without those genotypes. We did not find any associations in the African-American group. Using Multivariate Adaptive Regression Splines modeling for exploratory SNP–SNP interactions, our results showed that more aggressive PCa in Caucasians Americans is associated with theCTgenotype atIL8−47[odds ratios (OR) = 3.50; 95% CI = 1.13–10.88] or combined genotypes ofIL1B−511CCandIL10−1082GG(OR = 3.38; 95% CI = 1.70–6.71). Unfortunately, the same analysis could not be performed in the African-Americans due to limited number of individuals. With limited sample size, the results from this study suggest that SNPs in cytokine genes may be associated with PCa aggressiveness. More extensive studies are warranted to validate our findings.

Cytokine genetic polymorphisms and prostate cancer aggressiveness