@stag1, are you referring to hyperthermic treatments?

See this definition from the National Cancer Institute
"Hyperthermia (also called thermal therapy or thermotherapy) is a type of cancer treatment in which body tissue is exposed to high temperatures (up to 113°F). Research has shown that high temperatures can damage and kill cancer cells, usually with minimal injury to normal tissues. By killing cancer cells and damaging proteins and structures within cells, hyperthermia may shrink tumors."

Hyperthermia is under study in clinical trials (research studies with people) and is not widely available.
https://www.cancer.gov/about-cancer/treatment/types/surgery/hyperthermia-fact-sheet
Stag, are you looking into this type of treatment for breast cancer?