Abstract:
AIMS:The importance of polymorphisms in the dihydropyrimidine dehydrogenase gene (DPYD) for the prediction of severe toxicity in 5-fluorouracil (5-FU)-based chemotherapy is still unclear. This study aims to assess the predictive value of DPYD variation with respect to previously described DPYD variants for 5-FU toxicity. It represents the first analysis of the gene at the haplotype level, also capturing potentially important genetic variation located outside the coding regions of DPYD. MATERIALS & METHODS:The entire coding sequence and exon-flanking intronic regions of DPYD were sequenced in 111 cancer patients receiving fluoropyrimidine-based chemotherapy. DPYD haplotypes were inferred and their associations with severe 5-FU toxicity were assessed. RESULTS:None of the previously described deleterious variants (IVS14+1G>A, c.2846A>T and c.1679T>G) were detected in 24 patients who experienced severe 5-FU toxicity. A potential association was observed between a haplotype containing three novel intronic polymorphisms (IVS5+18G>A, IVS6+139G>A and IVS9-51T>G) and a synonymous mutation (c.1236G>A), which was observed five- out of eight-times in patients with severe adverse effects. CONCLUSION:The association of a haplotype containing no nonsynonymous or splice-site polymorphisms indicates that additional important genetic variation may be located in noncoding gene regions. Furthermore, a comparison with other studies suggests that the relative importance of particular DPYD mutations (IVS14+1G>A and c.2846A>T) for predicting severe 5-FU toxicity differs geographically across Europe.
journal_name
Pharmacogenomicsjournal_title
Pharmacogenomicsauthors
Amstutz U,Farese S,Aebi S,Largiadèr CRdoi
10.2217/pgs.09.28subject
Has Abstractpub_date
2009-06-01 00:00:00pages
931-44issue
6eissn
1462-2416issn
1744-8042journal_volume
10pub_type
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