Hyperthermia Penny K. Sneed, MD The idea of using heat to help destroy tumors has been around for a long time. In the early 1800s, there were medical reports that some people with cancer showed signs of tumor shrinkage after they developed high fevers. By the end of the last century, there were reports of some complete remissions because of high body temperatures. But hyperthermia—the word means elevated temperature and refers to the use of heat in the treatment of cancer— has only recently been added to the