Fig. 1From: Clinical significance and risk factors of International Society of Urological Pathology (ISUP) grade upgrading in prostate cancer patients undergoing robot-assisted radical prostatectomyBiochemical recurrence-free survival of patients stratified by pre-operative ISUP grade. a All patients b Patients with preoperative ISUP grade 1 c Patients with preoperative ISUP grade 2 or higher. Comparisons of Kaplan-Meier curves for patients with and without ISUP grade upgrading are given for all groups. A statistically significant difference was found in group C (Log-rank test: P value = 0.013)Back to article page