Very interesting! This is the first I've heard of this approach. From what I just read online, it is an offlabel treatment for prostate cancer that has been approved for cancers in the liver and pancreas. It works by placing 3-5 needles around the tumor and generating a current between them during the interval when the heart is not beating (to avoid interfering with heart rhythms. As such, it works best when there is one or very few nodules of well-contained cancer cells, which could be a gleason 3+4.