TMPRSS2-ERG has also been detected in prostate intraepithelial neoplasia (PIN) lesions and more rarely in benign prostatic hyperplasia (BPH) regions mainly in PCa-bearing glands.
In this study, we examined adenocarcinomas, prostatic intraepithelial neoplasia (PIN), and normal epithelium of the prostate retrieved from radical prostatectomy specimens to determine the frequency, specificity, tissue heterogeneity, and prognostic value of TMPRSS2 genetic alterations using a direct-labeled TMPRSS2 dual-color break-apart fluorescence in situ hybridization (FISH) probe cocktail designed to detect all known TMPRSS2-associated deletions or translocations.
The TMPRSS2-ERG fusion, present in approximately 50% of prostate cancers, is less common in prostatic intraepithelial neoplasia (PIN), raising questions about whether TMPRSS2-ERG contributes to disease initiation.