Transperineal template-guided saturation biopsy aimed at sampling one core for each milliliter of prostate volume: 103 cases requiring repeat prostate biopsy

Background We evaluated the cancer detection rate of prostate cancer using transperineal template-guided saturation biopsy aimed at sampling one core for each milliliter of prostate volume for patients requiring repeated prostate biopsies. Methods In total, 103 consecutive patients with repeated prostate biopsies were enrolled in this retrospective study. The number of biopsy cores was defined by prostate volume. In principle, one biopsy core covered 1 mL of prostate volume. We used a prostate brachytherapy template with a 5-mm grid and adopted a transperineal needle biopsy. Results The median age, prostate-specific antigen level, and prostate volume were 69 (range, 37–83) years, 9.2 (range, 1.9–107) ng/mL, and 34.7 (range, 18–76.7) mL, respectively. The median number of biopsy cores was 37 (range, 18–75 cores). Fifty-three patients (51.5%) were diagnosed with prostate cancer. The Gleason score was 6, 7, and 8–10 in 24.5, 64.2 and 11.3% patients, respectively. Forty-two patients (79.2%) were diagnosed with clinically significant PCa. Acute urinary retention was detected in 2 patients (1.9%). Conclusions Transperineal template-guided saturation biopsy with one core per milliliter of prostate volume helped achieve a high cancer detection rate and high significant cancer detection rate with acceptable biopsy-associated adverse events.