KLK3 and posterior cortical atrophy: The radiomics signature yielded an AUC, sensitivity, and specificity of 0.982 (0.964–0.999), 0.953 (0.865–0.985), and 0.961 (0.909–0.984), respectively, for discriminating between PCa and non-PCa groups among patients with PSA in the gray zone in the training cohort and 0.941 (0.888–0.995), 0.808 (0.613–0.918), 0.965 (0.870–0.991), respectively, in the validation cohort (Table 3).