predicting who will get severe hand-foot syndrome from Capecitabine

[Lani]

Clin Cancer Res. 2011 Feb 16. [Epub ahead of print]
A POLYMORPHISM IN THE CYTIDINE DEAMINASE PROMOTER PREDICTS SEVERE CAPECITABINE-INDUCED HAND-FOOT SYNDROME.
Caronia D, Martin M, Sastre J, De La Torre J, Garcia-Saenz JA, Alonso R, Moreno LT, Pita G, Diaz-Rubio E, Benitez J, Gonzalez-Neira A.

Genotyping Unit, Spanish National Cancer Research Centre.
Abstract
PURPOSE: Hand-foot syndrome (HFS) is one of the most relevant dose-limiting adverse effects of capecitabine, an oral prodrug of 5-fluouracil (5-FU) 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 DESIGN: We 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.

RESULTS: We 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-value=0.039). Since we found no association between the rs532545 genotype and CDD mRNA expression in EBV-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-value=0.028) in patients and with total CDD gene expression (p-value=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.

CONCLUSIONS: The deleted allele of rs3215400 shows an increased allele-specific expression and it is significantly associated with an increased risk of capecitabine-induced hand-foot syndrome.

PMID: 21325291