Rheumatoid arthritis (RA) is a common chronic autoimmune disease characterized by symmetric polyarthritis. This study was designed to investigate the associations between HLA-DRB1 gene polymorphisms and RA in the Chinese Han population of Shaanxi province, northwest of China. In total, we identified 31 high-resolution HLA-DRB1 alleles in 109 patients with RA. Compared with the controls, the AF of HLA-DRB1*04:05 (P = 0.000, Pc = 0.007, OR = 3.462, 95%CI: 1.749-6.852) was significantly higher in patients with RA. In addition, the patients with RA had higher allele frequency (AF) of the HLA-DRB1*04:03 (P = 0.030, Pc = NS, OR = 4.737, 95%CI: 1.012-22.180); DRB1*04:06 (P = 0.018, Pc = NS, OR = 5.288, 95%CI: 1.145-24.422) and the shared epitope (SE) alleles (P = 0.004, Pc = NS, OR = 2.166, 95%CI: 1.279-3.667), respectively. Moreover, positive possibilities of RF and anti-CCP were significant higher in SE-positive patients compared to SR-negative patients (OR = 4.787, 95%CI: 1.101-20.824; OR = 3.775, 95%CI: 1.106-12.876, respectively). Our results indicated that HLA-DRB1*04:05, *04:03, *04:06 and SE alleles might be susceptibility allele for RA in Chinese Han population of Shaanxi province, northwest of China.
© 2015 John Wiley & Sons Ltd.