@northoftheborder here is what Steve Arrivo just emailed me: “ PSE is a perfect test to show prostate treatment(s) were effective: focal ablation, prostatectomy, proton therapy, etc. as the cancer should be removed and therefore none detected. We have seen men with prostatectomies as far as 10 years out with a rising PSA and they have shown a high likelihood of cancer being present (which as we discussed is greater than 90% accurate – positive predictive value = 93%).”