Results: ERG-positive rate was 24.1 % (74/307) and significantly higher expression of ERG expression was observed in the subgroup that has lower Gleason score. (p<0.05) Analysis with the histologic pattern of prostate adenocarcinoma, tumors with discrete glandular unit (Gleason pattern 3) is shown higher frequency of ERG expression (p=0.007). Conclusion: ERG-positive case was smaller than that of western population (about 50 %) and other factors including age, tumor volume, initial PSA level, pathological stage and margin status were not significantly related with ERG expression. In conclusion, positive rate of ERG immunohistochemical staining is meaningful higher in the tumors with wellformed gland that is represented by lower Gleason score.