Analysis of prostate cancer association with four single-nucleotide polymorphisms from genome-wide studies and serum phyto-estrogen concentrations.

BACKGROUND

Both genetics and the environment are implicated as risk factors for prostate cancer (PCa). This population-based case-control study evaluated four single-nucleotide polymorphisms (SNPs) previously identified by genome-wide association studies to be associated with increased PCa susceptibility. Potential relationships between serum concentrations of phyto-estrogens and SNPs were also investigated.

METHODS

Four SNPs (rs10993994, rs2660753, rs1016343 and rs6983267) were genotyped in 247 PCa patients, 125 BPH patients and 274 control men recruited in Scotland. Serum concentrations of the phyto-estrogens enterolactone, equol, genistein and daidzein were measured by isotope dilution gas chromatography-mass spectrometry.

RESULTS

Increased PCa risk was associated with TT genotype of rs10993994 compared with CC and CT genotypes combined (odds ratio (OR)=1.87; 95% confidence interval (CI), 1.26-2.77). TT homozygotes who had low serum enterolactone concentrations (below median) were more likely to have PCa (OR=2.90; 95% CI, 1.28-6.57) than individuals with CC/CT genotype and high serum enterolactone concentrations (above median). PCa was not associated with the other three SNPs tested.

CONCLUSIONS

PCa susceptibility was associated with TT genotype of SNP rs10993994 in this cohort of Scottish men and the increased risk of PCa was modified by serum enterolactone concentrations.