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Mod Rheumatol. 2014 May;24(3):477-80. doi: 10.3109/14397595.2013.844308. Epub 2013 Oct 21.

Prevalence and incidence of polymyositis and dermatomyositis in Japan.

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1
Department of Public Health, Saitama Medical University Faculty of Medicine , Saitama , Japan.

Abstract

OBJECTIVES:

To estimate the number of patients with polymyositis/dermatomyositis (PM/DM) in Japan and the prevalence rate and incidence rate of the disease.

METHODS:

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.

RESULTS:

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.

CONCLUSIONS:

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.

PMID:
24252012
DOI:
10.3109/14397595.2013.844308
[Indexed for MEDLINE]
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