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5-fluorouracil (5-FU), an inhibitor of thymidylate synthase (EC 2.1.1.45), is clinically used in the treatment of several solid tumors, including colorectal, head and neck, gastric, and pancreatic cancer. The drug effectively inhibits deoxynucleoside triphosphate de novo synthesis. However, this inhibition can be circumvented by increased thymidine kinase (EC 2.7.1.21) activity. In the present study...
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