Pharmacogenomic and Pharmacokinetic Safety and Cost-saving Analysis in Patients Treated With Fluoropyrimidines

"Patients to treat with capecitabine/5-FU will be screened prior to start of therapy for DPYD\*2A. Patients heterozygous or homozygous mutant for DPYD\*2A receive dose reductions of capecitabine/5-FU of at least 50% in the first two courses. In case this dose is tolerated well, doses will be increased.~In addition, the pharmacokinetics of capecitabine/5-FU and their metabolites will be assessed in these patients."