Identification of DPYD variants and estimation of uracil and dihydrouracil in a healthy Indian population - Supplementary File

Background: 5-fluorouracil (5-FU) is a medicine used in cancer treatment. It
is eliminated from body by the enzyme DPD. Identifying deficiency in DPD before initiating 5-FU can
save patients from oral, intestinal, and bone marrow toxic effects. Methods: The uracil and dihydrouracil
(DHU, produced by DPD enzyme action) levels were measured and DPD gene (for identifying defects)
was sequenced in 100 healthy adults. Results: Participants with DPD gene sequence that is known to be
defective had higher plasma uracil levels and a low DHU-to-uracil ratio compared with those who did
not have a defective gene. Conclusion: Measuring plasma uracil and DHU-to-uracil ratio can help identify
people with defective DPD genes.