PT  - JOURNAL ARTICLE
AU  - Naoyuki Tsuchiya
AU  - Shigeto Kobayashi
AU  - Aya Kawasaki
AU  - Chieko Kyogoku
AU  - Yoshihiro Arimura
AU  - Masaharu Yoshida
AU  - Katsushi Tokunaga
AU  - Hiroshi Hashimoto
TI  - Genetic background of Japanese patients with antineutrophil cytoplasmic antibody-associated vasculitis: association of HLA-DRB1*0901 with microscopic polyangiitis.
DP  - 2003 Jul 01
TA  - The Journal of Rheumatology
PG  - 1534--1540
VI  - 30
IP  - 7
4099  - http://www.jrheum.org/content/30/7/1534.short
4100  - http://www.jrheum.org/content/30/7/1534.full
SO  - J Rheumatol2003 Jul 01; 30
AB  - OBJECTIVE: To examine association of 8 candidate genes with susceptibility to antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) in Japanese patients. Little is known on the genetic background of AAV in Japanese patients mainly because of the difficulty in collecting a sufficient number of samples for the genetics study. METHODS: Sixty-nine patients, including 50 with microscopic polyangiitis (MPA), were recruited in a multicenter study. Among them, 64 patients were positive for myeloperoxidase (MPO)-ANCA. Associations of HLA-DRB1, tumor necrosis factor-alpha promoter (TNF), TNF receptor 2 (TNFR2), Fcgamma receptor IIa (FCGR2A), IIb (FCGR2B), IIIa (FCGR3A), IIIb (FCGR3B), and CTLA-4 (CTLA4) polymorphisms were examined in a case-control analysis. RESULTS: A significant association of HLA-DRB1*0901 with MPA (p = 0.0037, OR 2.44, 95% CI 1.33-4.46), as well as with MPO-ANCA positivity (p = 0.0014, OR 2.44, 95% CI 1.41-4.22), was detected. There was no difference in the TNF promoter haplotype frequencies between patients with MPA and controls, excluding the possibility that the association of DRB1*0901 was secondarily caused by linkage disequilibrium with TNF. No association was observed for TNFR2, FCGR, or CTLA4 with MPA, nor with the presence of MPO-ANCA, although the combined genotype FCGR2A-131H/H and 3A-176F/F was increased in patients with MPA (p = 0.025). CONCLUSION: There was an association of HLA-DRB1*0901 with MPA and MPO-ANCA positive vasculitis in Japanese patients.