Atypical adenomatous hyperplasia of prostate lacks TMPRSS2-ERG gene fusion..     ///    Fifty-five separate prostate specimens containing AAH were investigated by fluorescence in situ hybridization and immunohistochemistry for TMPRSS2-ERG rearrangement.     ///    TMPRSS2-ERG rearrangements were not identified in AAH either by fluorescence in situ hybridization or by immunohistochemistry.     ///    The prevalence of TMPRSS2-ERG alteration in AAH is unknown. 