Fluoropyrimidine Tailored-dose Based on Uracil Concentration in Patients Treated for Digestive Carcinomas: Evaluation of Clinical Practice

In each group with an uracil dosage; at cycle 1; capecitabine or continuous 5-FU dose percentage will be evaluate retrospectively in our database

For each patient, uracil concentration will be evaluate and patients will be compared based on 16 ng/mL as threshold.

For each group of patient, on 16 ng/mL as threshold for uracil concentration, overall survival will be compared betwen the two groups of patients (Uracil \<16 vs Uracil ≥16).