Deoxyuridine as a surrogate marker of thymidylate synthase inhibition contributes to a multivariable model predicting 5-FU/LV response in metastatic colorectal cancer

The method used enables simultaneous analysis of multiple compounds within a tumor homogenate. Measuring dUr in homogenates before and after folate modulation, prior to initiation of FLV-based chemotherapy, could help predict tumor response and guide the choice between LV and ARF for optimal folate support.