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BACKGROUND: Cancer cells have increased steady state levels of reactive oxygen species (ROS; O2•and H2O2) compared to normal cells. It has been proposed that using redox active agents that further increase ROS levels will result is selective cancer cell death. This metabolic frailty can be targeted using drugs deemed safe for human use, ascorbate (ASC) and disulfiram (DSF), via a mechanism of H2O2 production. CuATSM is a drug being used in clinical trials to treat ALS disease. Imaging studies have shown that CuATSM preferentially concentrates in hypoxic tissues, releasing its Cu after entering cells. Copper (Cu) can participate in oxidation reactions that result in highly toxic hydroxyl radicals. Tumors often have areas of hypoxic tissue that exhibit resistance to ionizing radiation (IR). Our hypothesis is that CuATSM can be used to sensitize hypoxic regions of tumors to IR, ASC and/or DSF.

Abstract 3219: Sensitizing hypoxic small cell lung cancer cells to radiation and hydrogen peroxide-producing agents using CuATSM