KLK3 and erectile dysfunction: At one month post treatment, PSA had declined from 5.1 ng/mL pretreatment to 1.2 ng/mL. By four months post treatment, he reported an International Prostate Symptom Score (IPSS) score of 0 (no urinary symptoms) and a Sexual Health Inventory for Men (SHIM) score of 22 (mild erectile dysfunction). He was very pleased with the results of the treatment. The PSA had further declined to 0.7 ng/mL.