KLK3 and neoplasm: In correlation analysis with serum PSA level and tumor SUV, weak positive correlations were observed between PPAT SUV and serum PSA level (p = 0.048, r = 0.216) and tumor SUV (p = 0.013, r = 0.282), while PPAT HU showed a significant positive correlation with serum PSA level only (p = 0.002, r = 0.411).