I sleep on a 32"X20" FIR heating pad.(40C) I found it took care of my joint pain. Scan showed I had arthritis everywhere. Not sure what it did for cancer.
But since I had metastasis to the groin lymph nodes, I decided to add in a 20"x20" (50C) pad which I lay on top of my groin when I get up to pee around 3:30. I am not sure what it did for cancer, but I noticed it reduced the inflammation in the prostate. I haven't taken a Flomax since 5/8/18. So it is like a heat sandwich over the groin area. If I turn on my side, I re position the pad to stay over that area.
When I add in that extra pad I take supplements that claim anti cancer properties. Will report later if any benefit on the swelling in the feet.