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Large Animal Studies of Hyperthermia and Irradiation¹

Comparative Oncology Unit, Colorado State University, Fort Collins, Colorado 80523

Investigators who have studied hyperthermic response of spontaneous animal tumors have reported complete remission for variable periods of 15 to 38% of tumors treated. Normal tissue complications were minimal. Long-term control appears more likely if irradiation is combined with hyperthermia, but information is lacking to date to confirm this. Dose-response assays of radiation alone have been done which would make comparisons with hyperthermia and radiation more meaningful. Probabilities for increasing tumor control without significantly increasing normal tissue response can be estimated better from such assays. Spontaneous tumors in companion animals have advantages over rodent tumor systems of relatively larger treatment fields; longer follow-up times are possible, and serial monitoring of a variety of clinical data can be done. Experience of investigators using these tumors has shown that animal owners and referring veterinarians are most cooperative in reasonable, humane approaches to experimental cancer therapy.

¹ Presented at the Conference on Hyperthermia in Cancer Treatment, September 15 and 16, 1978, San Diego, Calif.