Abstract
Wistar Female rats bearing DMBA induced mammary tumours were subjected to whole body hyperthermia 42 degrees C dry heat exposure for 15 minutes daily for 6 weeks. The control group was maintained at a room temperature of 25 degrees C. Hyperthermia induced significant growth stimulation of breast tumour compared to the controls. Plasma estradiol was slightly decreased while total T4 and TSH values remained unchanged in heat stressed rats. Plasma prolactin was significantly increased together with enhanced synthetic activity of pituitary prolactin cells. It is concluded that heat acting as stressor accelerates breast tumor growth, probably by influencing synthesis of prolactin. Therefore the hormone dependency of tumours should be considered before hyperthermia is used as an anticancer modality.
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