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The involvement of uracil-DNA glycosylase (UNG) in the pathogenesis of cancer is well documented. In contrast, the role of this protein in rheumatoid arthritis (RA) development is not well defined, although previous studies suggest a possible link between autoimmune diseases and malignancy. Therefore, we aimed to examine whether there is a link between UNG genetic polymorphisms and RA. Our present study investigated the effects of UNG (rs3219218 and rs246079) single nucleotide polymorphisms (SNPs) on RA among Taiwan's Han Chinese population. Polymorphism of the UNG gene was analyzed in 192 controls and 183 RA patients. Genotyping for UNG SNPs was performed by restriction fragment length polymorphism assay. Our data confirmed statistically significant variations in genotype frequency distributions at rs246079 SNP between RA patients and controls (P = 3.05 × 10(-4)). The G allele at rs246079 SNP is a high-risk factor in developing RA (odds ratio [OR] = 1.77; 95% confidence interval [CI] = 1.290-2.42). A comparison of haplotype frequencies between the case and the control revealed that RA patients with the Ht2 haplotype are at additional risk for RA development (P = 0.042). Our data yielded new information on UNG polymorphisms associated with RA development and as RA molecular markers. The polymorphisms revealed by the present study merit further investigation.

The involvement of the epidermal growth factor receptor (EGFR) in the pathogenesis of cancer is well documented. In contrast, its role in rheumatoid arthritis (RA) development is not that well defined although previous studies suggested the possible link between autoimmune diseases and malignancy. Therefore, we aimed to examine whether there is a link between the EGFR genetic polymorphisms and the RA. Our study gauged the effects of EGFR (rs11543848 and rs17337023) single-nucleotide polymorphisms (SNPs) on RA among Taiwan’s Han Chinese population. Polymorphism of EGFR gene was analyzed in 188 RA patients and 128 control subjects. Genotyping for EGFR SNPs was performed by restriction fragment length polymorphism (RFLP) assay. Our data confirmed statistically significant increased risk of RA development in subjects with A carrier at rs17337023 SNP (P

This study examines whether or not MBD4 polymorphism is a marker for rheumatoid arthritis (RA) susceptibility or severity for Chinese patients in Taiwan. This study included 193 patients with RA, while 190 unrelated healthy individuals living in Central Taiwan served as controls. The relationship between MBD4 polymorphism and clinical manifestations of RA was evaluated. For the genotype and allelic frequency of MBD4-1057 polymorphism, there were no statistically significant differences between patients with RA and controls. There were significant differences in the distribution of MBD4-8666 polymorphism frequencies between patients with RA and controls [P = 0.013; P (corrected) (Pc) = 0.039]. There were also significant relationships in the distribution of MBD4-9229 polymorphism genotype between patients with RA and controls (P = 0.007; Pc = 0.021). However, we did not detect any associations for MBD4-1057, MBD4-8666 or MBD4-9229 with rheumatoid factor presence, extra-articular involvement or bone erosion in patients with RA. Results suggest that MBD4-8666 and MBD4-9229, but not MBD4-1057, gene polymorphisms are related to RA in Chinese patients in Taiwan.