PON1 and posterior cortical atrophy: ROC analysis of this parameter showed that PON1 activity allowed identification of patients in whom biochemical recurrence of PCa was later diagnosed with an AUC value of 0.746 (sensitivity 81.8%, specificity 64.4%) for the value before RT and AUC value of 0.757 (sensitivity 88.9%, specificity 64.9%) for the value after RT (Figure 2).