Safety, Feasibility and Cost-effectiveness of Genotype-directed Individualized Dosing of Fluoropyrimidines
Status:
Completed
Trial end date:
2018-03-01
Target enrollment:
Participant gender:
Summary
In this study it will be determined whether the rate of severe toxicity associated with
fluoropyrimidine treatment (capecitabine or 5-fluorouracil) can be significantly diminished
by individualized dosing of fluoropyrimidines based on upfront genotypic assessment of
dihydropyrimidine dehydrogenase (DPD) deficiency.
In addition to the genotyping, the DPD phenotype of all patients will be determined by
measuring the baseline dihydrouracil/uracil (DHU/U) ratio, in order to investigate whether
phenotype-guided treatment can further improve patient safety. In a subgroup of patients,
other phenotyping methods will be tested: measuring the plasma levels of uracil after a
uracil test dose and a uracil breath test after a dose of [2-13C] -labeled uracil. To
validate these tests, these phenotyping results will be compared with the results of a DPD
activity assay (which measures DPD enzyme activity in peripheral blood mononuclear cells),
which is considered the gold standard in measuring DPD phenotype.