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OF THE DISSERTATION CANCER THERAPY COMBINING THE MODALITIES OF HYPERTHERMIA AND CHEMOTHERAPY: IN VITRO CELLULAR RESPONSE AFTER RAPID HEAT ACCUMULATION IN THE CANCER CELL by Yuan Tang Florida International University, 2010 Miami, Florida Professor Anthony J. McGoron, Major Professor Hyperthermia is usually used at a sub-lethal level in cancer treatment to potentiate the effects of chemotherapy. The purpose of this study is to investigate the role of heating rate in achieving synergistic cell killing by chemotherapy and hyperthermia. For this purpose, in vitro cell culture experiments with a uterine cancer cell line (MES-SA) and its multidrug resistant (MDR) variant MES-SA/Dx5 were conducted. The cytotoxicitiy, mode of cell death, induction of thermal tolerance and P-gp mediated MDR following the two different modes of heating were studied. Doxorubicin (DOX) was used as the chemotherapy drug. Indocyanine green (ICG), which absorbs near infrared light at 808nm (ideal for tissue penetration), was chosen for achieving rapid rate hyperthermia. A slow rate hyperthermia was provided by a cell culture incubator. The results show that the potentiating effect of hyperthermia to chemotherapy can be maximized by increasing the rate of heating as evident by the results from the cytotoxicity assay. When delivered at the same thermal dose, a rapid increase in temperature from 37 °C to 43 °C caused more cell membrane damage than gradually heating the cells from 37 °C to 43 °C and

Cancer Therapy Combining Modalities of Hyperthermia and Chemotherapy: in vitro Cellular Response after Rapid Heat Accumulation in the Cancer Cell