Development and External Validation of a Nomogram Predicting the Probability of Significant Gleason Sum Upgrading among Japanese Patients with Localized Prostate Cancer

Figure 1

Nomogram based on 508 patients treated at Chiba Cancer Center, for predicting significant Gleason sum upgrading between biopsy and radical prostatectomy. PSA: prostate-specific antigen (ng/mL); Gl1: primary biopsy Gleason score; Gl2: secondary biopsy Gleason score. To obtain the nomogram-predicted probability of significant biopsy upgrading, locate the patient values at each axis, draw a vertical line to the “Points” axis to determine how many points are attributed to each variable value; total the points for all variables, and locate the sum on the “Total Points” line to assess the individual probability of significant biopsy Gleason sum upgrading on the Probability of Significant Upgrading line.