This is, of course, anecdotal. A friend had prostate cancer with a PSA of 90 (less than 4 is normal, over 10 is almost always cancer). He researched alternatives, so sat on a neodymium super-conducting magnet. In 2 months his PSA was undetectable. He stopped sitting on the magnet and his PSA elevated. He is facing surgery.
I also know of 2 cases of advanced prostate cancer who were cured by taking 1 gram of Rock Simpson Oil (RSO) daily for 2 months. 1 gram is about 50 times the usual amount of RSO taken. I have not seen these two acquaintances for quite some time, so I do not know if their prostate cancer returned.