Interleukin-6 polymorphism is associated with more aggressive prostate cancer.
OBJECTIVE
: 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.


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.
Tan
Dongfeng
D
Department of Pathology, Gynecologic Oncology Group Statistical and Data Center, Roswell Park Cancer Institute, Buffalo, New York 14263, USA.
Wu
Xiuxian
X
Hou
Min
M
Lee
Soo Ok
SO
Lou
Wei
W
Wang
Jianmin
J
Janarthan
Bagirathan
B
Nallapareddy
Sujatha
S
Trump
Donald L
DL
Gao
Allen C
AC
D000273:Adipose Tissue / Q000473:pathology; D001808:Blood Vessels / Q000473:pathology; D020022:Genetic Predisposition to Disease / Q000235:genetics; D006801:Humans; D015850:Interleukin-6 / Q000235:genetics*; D008297:Male; D009361:Neoplasm Invasiveness; D009364:Neoplasm Recurrence, Local / Q000235:genetics*; D011110:Polymorphism, Genetic; D011471:Prostatic Neoplasms / Q000235:genetics* / Q000473:pathology; D012189:Retrospective Studies; D012669:Seminal Vesicles / Q000473:pathology
D015850:Interleukin-6