D’Amico risk classification
D’Amico risk classification was performed according to the preoperative total PSA value, prostate biopsy GS and clinical T stages. According to this classification, patients were divided into 3 groups as low risk, intermediate risk and high risk. Patients with preoperative total PSA <10 ng / dl, GS <7 and clinical stage cT1-2a were considered low-risk group. Patients with total PSA 10-20 ng / dl or GS 7 or clinical stage cT2b were defined as intermediate-risk group. Lastly, patients with total PSA value> 20 ng / dl or GS> 7 or clinical stage cT2c were identified as the high-risk group 3.