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Pharmacological ascorbate (AscH−) selectively induces cytotoxicity in pancreatic cancer cells vs normal cells via the generation of extracellular hydrogen peroxide (H2O2), producing double-stranded DNA breaks and ultimately cell death. Catalytic manganoporphyrins (MnPs) can enhance ascorbate-induced cytotoxicity by increasing the rate of AscH− oxidation and therefore the rate of generation of H2O2...