2. "The effects of a diet high in phytoestrogens on prostate cancer tumor progression differ between men with different genotypes of polymorphisms in the ERß gene". The men will be divided into two subgroups, those bearing TT or TC/CC alleles, of the single-nucleotide polymorphism (SNP) rs2987983-13950 T/C in the ERß-gene, in which the hypothesis will be tested.