Interleukin (IL)-8 polymorphisms and risk of prostate disorders

Prostate cancer (PCa) and benign prostate hyperplasia (BPH) as two prevalent age-related disorders in male have some shared genetic and immunological underlying mechanisms. However, researchers have aimed at identification of specific biomarkers with the ability to differentiate between these disorders. In the present study, we genotyped the rs4073, rs2227306 and rs1126647 single nucleotide polymorphisms within IL-8 gene in 530 individuals including 130 PCa patients, 200 BPH patients and 200 male controls. The rs2227306 alleles and genotypes were distributed equally in the three study groups. The frequency of the A allele of the rs4073 was significantly lower in PCa group compared with BPH group (OR (95% CI) = 0.62 (0.46-0.84), adjusted P value = 0.006). This allele was negatively associated with PCa risk in dominant model (OR (95% CI) = 0.53 (0.34-0.83), adjusted P value = 0.02). When comparing PCa and BPH groups, the rs1126647 was associated with PCa risk in recessive model (OR (95% CI) = 2.14 (1.23-3.72), adjusted P value = 0.02). The A T A haplotype (rs4073, rs2227306 and rs1126647 respectively) was less frequent in PCa group compared with BPH group (OR (95% CI) = 0.4 (0.22-0.75), adjusted P value = 0.03). Consequently, our data demonstrated significant differences in allele, genotype and haplotype frequencies of IL-8 variants between BPH and PCa patients which might imply distinct role for this chemokine in the pathogenesis of these disorders. Future studies are needed to elaborate the underlying mechanism of these observations.