• Clin Cancer Res · Apr 2011

    A polymorphism in the cytidine deaminase promoter predicts severe capecitabine-induced hand-foot syndrome.

    • Daniela Caronia, Miguel Martin, Javier Sastre, Julio de la Torre, José Angel García-Sáenz, Maria R Alonso, Leticia T Moreno, Guillermo Pita, Eduardo Díaz-Rubio, Javier Benítez, and Anna González-Neira.
    • Human Genotyping Unit-CeGen, Human Cancer Genetics Programme, Spanish National Cancer Research Centre, Madrid, Spain.
    • Clin Cancer Res. 2011 Apr 1; 17 (7): 2006-13.

    PurposeHand-foot syndrome (HFS) is one of the most relevant dose-limiting adverse effects of capecitabine, an oral prodrug of 5-fluorouracil used in the standard treatment of breast and colorectal cancer. We investigated the association between grade 3 HFS and genetic variations in genes involved in capecitabine metabolism.Experimental DesignWe genotyped a total of 13 polymorphisms in the carboxylesterase 2 (CES2) gene, the cytidine deaminase (CDD) gene, the thymidine phosphorylase (TP) gene, the thymidylate synthase (TS) gene, and the dihydropyrimidine dehydrogenase (DPD) gene in 130 patients treated with capecitabine. We correlated these polymorphisms with susceptibility to HFS.ResultsWe found an association of HFS appearance with rs532545 located in the promoter region of CDD (OR = 2.02, 95% CI = 1.02-3.99, P = 0.039). Because we found no association between the rs532545 genotype and CDD mRNA expression in Epstein-Barr virus lymphoblastoid cells, we explored additional genetic variations across the CDD promoter. We found an insertion, rs3215400, in linkage disequilibrium with rs532545 (D' = 0.92), which was more clearly associated with HFS (OR = 0.51, 95% CI = 0.27-0.95, P = 0.028) in patients and with total CDD gene expression (P = 0.004) in lymphoblastoid cells. In silico analysis suggested that this insertion might create a binding site for the transcriptional regulator E2F. Using a SNaPshot assay in lymphoblastoid cells, we observed a 5.7-fold increased allele-specific mRNA expression from the deleted allele.ConclusionsThe deleted allele of rs3215400 shows an increased allele-specific expression and is significantly associated with an increased risk of capecitabine-induced HFS.

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