Fig. 4From: Predicting Gleason sum upgrading from biopsy to radical prostatectomy pathology: a new nomogram and its internal validationCalibration curve of the Gleason sum upgrading model. The nomogram-predicted probabilities are comparable to the actual probabilities of GSU. Perfect prediction would correspond to a slope of 1 (diagonal 45° broken line). The solid red line indicates the original predictive ability. The solid black line indicates the bootstrap-corrected model performanceBack to article page