DNA repair gene XRCC2 and XRCC3 polymorphisms and susceptibility to cancers of the upper aerodigestive tract

International Journal of Cancer. Journal International Du Cancer
Simone BenhamouAri Hirvonen

Abstract

Cigarette smoke can generate reactive oxygen species, which are capable of inducing double-strand breaks (DSBs) in DNA. Polymorphisms in XRCC2 and XRCC3 genes, involved in DSBs repair pathways, may alter an individual's susceptibility to smoking-related cancers. We investigated the effect of XRCC2 Arg(188)His and XRCC3 Thr(241)Met polymorphisms in cancer proneness in 121 oral/pharynx cancer cases, 129 larynx cancer cases and 172 noncancer controls, all Caucasian smokers. The XRCC2 His-allele was associated with a significantly increased risk of pharyngeal cancer (OR=2.9, 95% CI: 1.3-6.2). No significant associations were observed between the XRCC3 Thr(241)Met polymorphism and overall risk of developing UADT cancers. However, quite opposite to the expectations, a reduced risk of supraglottic cancer was found for carriers of the XRCC3 Met variant allele (OR=0.3, 95% CI: 0.2-0.7). These findings provide evidence for the view that polymorphisms in DNA repair genes may modify individual susceptibility to smoking-related cancers.

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