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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 …