Association analysis, based on linkage disequilibrium between specific alleles in the candidate loci and nearby genetic markers, has been proposed to identify genes conferring susceptibility to multifactorial diseases. Using the affected sib-pair method, we previously mapped four candidate chromosomal regions, 1p32, 2q33-q35, 11p13-p14, and 21q21, for gastric cancer by linkage analysis. To identify genes involved in the disease, we performed a gene-based association analysis of 66 genes, located on 21p11-21q22, using 126 single nucleotide polymorphisms (SNPs) as genetic markers in 373 patients with 250 controls. We found a significant association of five SNPs in the stress70 protein chaperon family member STCH gene with gastric cancer, especially with the non-cardia localization subgroup (P=0.0005-0.02, odds ratio=1.44-1.72). Comparisons of haplotype frequency showed significant association between TTGGC haplotype and gastric cancer (P=0.0001, odds ratio=1.59). These results suggest that, in the Japanese population, STCH might be a new candidate for conferring susceptibility to this disease.
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