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Clin Exp Nephrol. 2013; 17: 611–614.
Published online May 30, 2013. doi:  10.1007/s10157-013-0813-9
PMCID: PMC3824199
Epidemiology of vasculitides: differences between Japan, Europe and North America
Shigeto Kobayashicorresponding author and Shouichi Fujimoto
Rheumatology, Department of Internal Medicine, Juntendo University Koshigaya Hospital, 560 Fukuroyama, Koshigaya, Saitama 343-0032 Japan
Department of Hemovascular Medicine and Artificial Organs, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
Shigeto Kobayashi, shigeto/at/juntendo.ac.jp.
corresponding authorCorresponding author.
Received October 14, 2012; Accepted April 27, 2013.
The epidemiology of systemic vasculitides differs between Japan, Europe and North America. Takayasu’s arteritis occurs frequently in Japan, unlike giant cell arteritis. A collaborative international study comparing the epidemiology of anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis between Japan and the United Kingdom (UK) demonstrated that microscopic polyangiitis and myeloperoxidase-ANCA were more common in Japan whereas granulomatosis with polyangiitis and pronase 3-ANCA were more common in the UK. These differences may be attributed to differences in latitude and genetic backgounds. These findings provide useful information on the aetiology and pathogenesis of primary systemic vasculitides in various geographical regions.
Keywords: Microscopic polyangiitis, Granulomatosis with polyangiitis, Takayasu’s arteritis, Giant cell arteritis, Rapidly progressive glomerulonephritis, HLA-DRB1*09:01
The incidence and clinical features of several types of vasculitides differ between Japan, Europe and North America, unlike those of rheumatoid arthritis, systemic lupus erythematosus, and other rheumatic diseases in these geographical regions [1, 2]. These vasculitides are more rare and heterogeneous in terms of clinical features, types of anti-neutrophil cytoplasmic antibody (ANCA) and response to treatment. Because geographical differences in the incidence of ANCA-associated vasculitis (AAV) have been demonstrated in Europe [3], we extended our research to determine the incidence, clinical phenotype and the associated genetic factors of vasculitides between Japan, Europe, and North America. In this review, we present a brief account of the results of these studies.
TAK and GCA are two types of vasculitis characterized by inflammation of the large vessels.
Histologically, both demonstrate granulomatous vasculitis with giant cells. Fewer patients with GCA have been reported in the Japanese literature than in the European and North American literatures. In contrast, more patients with TAK have been reported in Japan than in Europe or the USA [4]. The point prevalence of GCA in Japan was 690 patients in 1997 (95 % confidence interval [CI] 400–980) [5]. The prevalence of patients ≥50 years of age was 1.47 cases (95 % CI 0.86–2.10) per 10 million people in Japan compared with 200 and 60 cases per 10 million people in the USA and Spain, respectively [6, 7].
The reason for the low incidence of GCA in Japan remains unclear; however, genetic factors affecting the incidence of these diseases are unique and important. The HLA-DRB1*0401 and HLA-DRB1*0404 haplotypes are predominantly (60 %) detected in patients with GCA in America. These haplotypes were less frequently detected in 493 Japanese healthy controls (2.9 and 0.7 %, respectively) than in 60 American healthy controls (15.9 and 3.2 %, respectively) [5]. This explains why the incidence and/or prevalence of GCA is not high in Japan. Moreover, our study found no significant differences in the clinical features of GCA between Japan and other countries, although GCA cases are less common in Japan than in the USA or Europe [8].
TAK, which predominantly affects young females in Japan, affects the aortic arch (Type I), as determined by angiography. The incidence of HLA-B52 (56 %) and HLA-B39 (17 %) was significantly higher in patients with TAK than in healthy controls (25 and 6 %, respectively) in a Japanese study. However, several patients with TAK in India and other East Asian countries are reportedly middle-aged males who express HLA-B39 and exhibit abdominal aorta involvement (Type III).
Geographic factors: the latitude of Japan
Japan is located between the latitudes of 26–45°N. Asahikawa city (43.5°N) on Hokkaido Island is close to the latitude of Lugo, Spain (42°N) [1]. On this island, there are more patients with microscopic polyangiitis (MPA); a higher number of patients with AAV are MPO-ANCA-positive than granulomatosis with polyangiitis (GPA)- or pronase 3 (PR3)-positive [1]. These data are compatible with the latitude theory of AAV [3] (Fig. 1).
Fig. 1
Fig. 1
Geographical differences in the incidences of vasculitides. GCA and GPA occur more frequently in North Europe and North America whereas Takayasu arteritis and MPA occur more frequently in Japan
On the other hand, it is interesting to note that a study from Beijing (39.5°N), China, demonstrated that 60.7 % (54/89) of patients with GPA were MPO-ANCA-positive and 38.2 % (34/89) were PR3-ANCA-positive. Patients with MPO-ANCA had multiorgan involvement with higher serum creatinine levels than PR3-ANCA-positive patients with GPA [9].
Differences in clinical phenotypes
Differences in renal involvement in GPA and MPA between patients in the UK and Japan were reported by Watts et al. [10]. Supporting data indicated that patients with localized GPA were more frequent than GPA patients with renal involvement in Japan, which was reported by Harabuchi et al. from Asahikawa Medical University and confirmed in our investigation [11]. Another report by certain otolaryngologists reached the same conclusion [12]. Moreover, two studies demonstrated renal involvement in 12–40 % of 21 patients with GPA [13, 14]. In another hospital-based, nationwide, retrospective study conducted in Japan from 1988 to 1998 by the Japanese Ministry of Health, Labour and Welfare, renal involvement was diagnosed in 39–63 % of 172 patients. In two studies by Gross et al. in Germany and Hoffman et al. in the USA, renal involvement was diagnosed in 77 % of 155 patients and 77 % of 70 patients with GPA, respectively [15, 16].
Genetic factors
A genetic analysis of patients with MPA was initiated in 1997 by the Research Committee of Intractable Vasculitis of the Japanese Ministry of Health and Welfare (Chief Investigator Prof. Hiroshi Hashimoto). A significant association between HLA-DRB1*0901 and MPA (P = 0.037; odds ratio [OR] 2.44; 95 % CI 1.33–4.46) as well as MPO-ANCA positivity (P = 0.014; OR 2.44; 95 % CI 1.41–4.22) was demonstrated by Tsuchiya et al. [17, 18]. Another report published in 1996 demonstrated an association between HLA-DR9 in 62.5 % patients and cANCA-positive GPA (10/16) compared with 26 % in healthy controls (P < 0.05) [19]. The decreased activation potential of natural killer cells and/or T cells associated with killer cell immunoglobulin-like receptor or HLA genotypes was demonstrated in patients with MPA, thus suggesting that these patients may have insufficient resistance to infections. An autoreactive T-cell response to the MPO fragments was detected in addition to the distinct epitopes of MPO fragments recognized by HLA-DR-restricted CD4 + T cells [20].
The Miyazaki-UK Study: a population-based, prospective study
The epidemiological manifestations of AAV differ between geographical regions [3]. However, there are no prospective studies comparing the incidence of AAV between Japan and Europe over the same time period using similar case definitions [10, 21]. The incidence of AAV in Miyazaki Prefecture, Japan, and Norfolk, UK, between 2005 and 2009, was prospectively determined using a population-based method. Patients with AAV were defined and classified according to the European Medicines Agency algorithm. The number of cases of AAV in Japan and the UK was 86 and 50, respectively, and the average annual incidence over the 5-year period was 22.6 per million people (95 % CI 19.1–26.2) and 21.8 per million people (95 % CI 12.6–30.9) in Japan and the UK, respectively. The average patient age was higher in Japan than the UK (mean [median]) 69.7 [72] vs 60.5 [61] years]. MPA was the predominant subtype in Japan (83 %), whereas GPA was more frequent in the UK (66 %). Regarding the pattern of ANCA positivity, >80 % patients in Japan were pANCA- and/or MPO-positive, whereas two-thirds of patients in the UK were cANCA- and/or PR3-positive. Renal involvement in patients with MPA was common in both countries but it was significantly less common in GPA patients in Japan than in GPA patients in the UK. There was no major difference in the incidence of AAV between Japan and the UK, but this prospective study found that MPA and MPO-ANCA were more common in Japan whereas GPA and PR3-ANCA were more common in the UK [21].
Conclusion
These findings provide useful information on the aetiology and pathogenesis [22, 23] of primary systemic vasculitides in various geographical regions.
Acknowledgments
The work of the authors (SK and SF) discussed in this study was supported by a Grant-in-Aid from the Ministry of Health, Labour and Welfare of Japan.
The authors have declared that no conflict of interest exists.
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