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  • Title: Interleukin-6 polymorphism is associated with more aggressive prostate cancer.
    Author: Tan D, Wu X, Hou M, Lee SO, Lou W, Wang J, Janarthan B, Nallapareddy S, Trump DL, Gao AC.
    Journal: J Urol; 2005 Aug; 174(2):753-6. PubMed ID: 16006970.
    Abstract:
    PURPOSE: : Interleukin-6 (IL-6) has an important role during prostate cancer progression and IL-6 levels in the serum of patients with hormone refractory and metastatic prostate cancer are significantly increased compared with those in patients with hormone sensitive and localized prostate cancer. The G>C polymorphism at position -174 in the promoter of the IL-6 gene has been associated with differences in IL-6 transcription in vitro and IL-6 protein levels in vivo. We determined the association of IL-6 polymorphism with prostate cancer progression. MATERIALS AND METHODS: : We examined the association of IL-6 polymorphism with the risk of advanced disease in 95 patients with different stages of prostate cancer using the tetra-primer polymerase chain reaction genotyping method. RESULTS: : We found that the -174G>C genotype of IL-6 gene was associated with an overall increased risk of advanced prostate cancer. A strong association between this genotype and Gleason score was observed at the -174G>C locus of the IL-6 gene (p <0.001). The distribution of this genotype was also significantly different between stages T3-T4 and T1-T2 tumors (p <0.001). In addition, the IL-6 genotype was linked with vascular invasion (p = 0.024), seminal vesicle involvement (p = 0.006) and capsular invasion (p <0.001). Furthermore, the -174G>C genotype of the IL-6 gene was significantly associated with increased serum prostate specific antigen (p = 0.004) and with recurrent prostate cancer compared with GG homozygotes (p = 0.027). CONCLUSIONS: : These data demonstrate a strong association of the -174G>C polymorphism of the IL-6 gene with the aggressiveness and recurrence of prostate cancer, suggesting that genetic predisposition of genetic differences in the human IL-6 gene could be linked to the risk of recurrent prostate cancer.
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