Purpose: We analyzed patterns of tumor distribution in radical prostatectomy specimens from patients with repeat biopsies to determine additional appropriate biopsy locations for repeat biopsy. Methods: Between January 2000 and June 2005, a total of 382 patients underwent transrectal ultrasound-guided prostate biopsy. Of these, 47 patients underwent repeat biopsy. Radical prostatectomy was performed for 7 of 22 cancer-positive cases. The 7 specimens were superimposed to create an idealized prostate gland at 3 levels: apex, mid-prostate, and base. We compared these tumor maps with those from 35 initial biopsy positive patients. Results: Prostate cancer was detected in 22 of 47 patients who underwent repeat biopsy. Tumor mapping showed that tumors detected on repeat biopsy in comparison with tumor maps of initial biopsy were dense at the periurethral area of the apex in prostate. Conclusions: Additional biopsy cores taken from periurethral area of the apex on repeat biopsy might further enhance the detection of cancers.

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