Abstract:
BACKGROUND:Severe toxicity to 5-fluorouracil (5-FU) based chemotherapy in gastrointestinal cancer has been associated with constitutional genetic alterations of the dihydropyrimidine dehydrogenase gene (DPYD). METHODS:In this study, we evaluated DPYD promoter methylation through quantitative methylation-specific PCR and screened DPYD for large intragenic rearrangements in peripheral blood from 45 patients with gastrointestinal cancers who developed severe 5-FU toxicity. DPYD promoter methylation was also assessed in tumor tissue from 29 patients RESULTS:Two cases with the IVS14+1G > A exon 14 skipping mutation (c.1905+1G > A), and one case carrying the 1845 G > T missense mutation (c.1845G > T) in the DPYD gene were identified. However, DPYD promoter methylation and large DPYD intragenic rearrangements were absent in all cases analyzed. CONCLUSIONS:Our results indicate that DPYD promoter methylation and large intragenic rearrangements do not contribute significantly to the development of 5-FU severe toxicity in gastrointestinal cancer patients, supporting the need for additional studies on the mechanisms underlying genetic susceptibility to severe 5-FU toxicity.
journal_name
BMC Cancerjournal_title
BMC cancerauthors
Savva-Bordalo J,Ramalho-Carvalho J,Pinheiro M,Costa VL,Rodrigues A,Dias PC,Veiga I,Machado M,Teixeira MR,Henrique R,Jerónimo Cdoi
10.1186/1471-2407-10-470subject
Has Abstractpub_date
2010-09-01 00:00:00pages
470issn
1471-2407pii
1471-2407-10-470journal_volume
10pub_type
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