Role of TMPRSS2-ERG gene fusion in negative regulation of PSMA expression..     ///    The purpose of this investigation is to determine whether PSMA expression can be regulated by the TMPRSS2-ERG gene fusion.     ///    Our data indicated that downregulation of PSMA in androgen-treated VCaP cells appears partially mediated by TMPRSS2-ERG gene fusion..     ///    "After 24 hours of androgen treatment, TMPRSS2-ERG mRNA level was increased in VCaP cells. "