Death receptor 4 variants and colorectal cancer risk.

The tumor necrosis factor-related apoptosis-inducing ligand receptor modulates apoptotic response by binding to the proapoptotic death receptor 4 (DR4). Perturbed apoptosis due to missense alterations in the candidate tumor suppressor gene DR4 leads to deregulated cell proliferation and cancer predisposition. Recent studies have discussed the association of DR4 variants with cancer risk. We evaluated, for the first time, the role of the Thr(209)Arg (626C>G) and Glu(228)Ala (683A>C) polymorphisms on colorectal cancer risk by genotyping 659 incident cases and 607 healthy controls drawn from the German population-based Darmkrebs: Chancen der Verhütung durch Screening (DACHS) study. Whereas DR4 Glu(228)Ala was not associated with colorectal cancer, Thr(209)Arg heterozygotes were at a significantly decreased colorectal cancer risk [odds ratio (OR), 0.73; 95% confidence interval (95% CI), 0.54-0.97]. Stratification according to sex and age exhibited a significant association of Thr(209)Arg with a decreased risk for male heterozygotes (OR, 0.68; 95% CI, 0.46-0.99) and for Arg(209) carriers > or =65 years of age (OR, 0.65; 95% CI, 0.46-0.92) as well as an enhanced risk for female Ala(228) carriers in a allele dose-dependent manner (P(trend) = 0.01). Subsite analysis revealed a protective effect of Thr(209)Arg for rectal cancer risk (OR, 0.67; 95% CI, 0.48-0.95) and a significant risk increase for Ala(228) carriers with advanced colorectal cancer stages (P(trend) = 0.04). Haplotype analysis revealed a 2.4-fold risk for carriers of the rare 626C-683C haplotype (1% prevalence in the general population; OR, 2.37; 95% CI, 0.98-5.76). The score statistic yielded an empirical P of 0.03 of the haplotype-specific test for 626C-683C based on 20,000 simulations, suggesting that DR4 626C-683C may affect colorectal cancer predisposition.