Prevalence and incidence of polymyositis and dermatomyositis in Japan. Issue 3 (May 2014)

• Record Type: Journal Article
• Authors: Ohta, Akiko; Nagai, Masaki; Nishina, Motoko; Tomimitsu, Hiroyuki; Kohsaka, Hitoshi
• Is Part Of: Modern rheumatology. Volume 24:Issue 3(2014)
• Page Start: 477
• Page End: 480
• Publication Date: 2014-05
• Subjects: Rheumatology -- Periodicals; 616.723005
• DOI: 10.3109/14397595.2013.844308
• Languages: English
• ISSNs: 1439-7595

Abstract

<abstract> <title>Abstract</title> <p> <italic>Objectives.</italic> To estimate the number of patients with polymyositis/dermatomyositis (PM/DM) in Japan and the prevalence rate and incidence rate of the disease.</p> <p> <italic>Methods.</italic> The electronic database in the nationwide registration system on intractable diseases from 2003 to 2010 was utilized to identify the number of prevalent and incident cases of PM/DM. The electronic data entry rate was used to establish the total number of registered cases.</p> <p> <italic>Results.</italic> The estimated total number of patients with PM/DM and the prevalence rate in Japan in 2010 were 17, 000 and 13.2 per 100, 000 population, respectively. The prevalence of PM/DM ranged from 10 to 13 per 100, 000 population with a trend toward increasing over time. The incidence of PM/DM was estimated within the range 10–13 per 1, 000, 000 person-years, except for 2003.</p> <p> <italic>Conclusions.</italic> We report the prevalence and incidence of PM/DM recently in Japan for the first time at the nationwide population level. Because the prevalence seems to be increasing recently, continued monitoring of these epidemiologic features is required.</p> </abstract>