The Wall Street Journal
Adding Heat to Cancer Therapy
By LAURA JOHANNES
April 18, 2006; Page D4
The next hot thing in cancer treatment may be...heat. Recent studies show that adding hyperthermia, or heat therapy, to traditional radiation and chemotherapy can boost their effectiveness in certain cancers. Oncologists say the newest research is promising, but there is still limited evidence that hyperthermia prolongs survival. In hyperthermia, the cancerous area of the body is heated to up to 113 degrees Fahrenheit using a variety of methods, including microwave antennas, hot-water baths and infrared lamps. The therapy can take two hours or more, and is often repeated over several weeks. Depending on the heating method, narcotics or sedatives may be used to ease discomfort. One big risk is accidental burns -- which range from minor blisters to third-degree scalding.
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In the Journal of Clinical Oncology last year, scientists at Duke University Medical Center found that heat boosted the effect of radiation on tumors that occur on or just under the skin, in a variety of cancers. The biggest benefit was in patients who weren't able to get a full dose of radiation because they had had it previously. In that group, 68.2% of the patients who got radiation plus heat had their tumors disappear entirely, compared with only 23.5% of those who got radiation alone.
Many of the patients in that study had breast cancer that recurred on the chest wall after mastectomy. Based on the study, heat therapy is now standard at Duke for these patients, says Ellen L. Jones, the paper's lead author. Since many of the patients had rapidly spreading cancer, the study didn't show a survival benefit. Dr. Jones believes the therapy does extend life for some patients. At least, she says, it makes patients' final months less painful by shrinking tumors.
Heat is also being used to treat cancers in the abdominal cavity, which are usually the result of the spread of other cancers. Surgeons cut open the patient and remove tumors in the abdomen. Then -- in the hopes of killing remaining cancer cells -- they bathe the abdominal cavity with hot water and chemotherapy medicine. The therapy appears to be enormously helpful to treat spreading cancer of the appendix, says Paul Mansfield, an oncologist at M.D. Anderson Cancer Center in Houston. However, he adds, for other cancers, such as gastric and colon, more research is needed.
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