Real-time quantitative polymerase chain reaction analysis and in some cases DNA sequencing was used to validate the presence and the expression levels of TMPRSS2-ERG gene fusions.     ///    In our series of patients with prostate cancer over expression of the ERG gene predicted the presence of TMPRSS2-ERG rearrangements in almost all cases.     ///    The expression level of the TMPRSS2-ERG gene was studied in various histological grades of prostate cancer and castration-resistant prostate cancer (CPRC).     ///    " To assess whether oestrogen-regulated gene (ERG) expression analysis using GeneChip arrays can predict transmembrane protease, serine 2 (TMPRSS2)-ERG fusion. "