Multicenter questionnaire survey for sporadic inclusion body myositis in Japan

Naoki Suzuki, Madoka Mori-Yoshimura, Satoshi Yamashita, Satoshi Nakano, Ken ya Murata, Yukie Inamori, Naoko Matsui, En Kimura, Hirofumi Kusaka, Tomoyoshi Kondo, Itsuro Higuchi, Ryuji Kaji, Maki Tateyama, Rumiko Izumi, Hiroya Ono, Masaaki Kato, Hitoshi Warita, Toshiaki Takahashi, Ichizo Nishino, Masashi Aoki

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Background: Sporadic inclusion body myositis (sIBM) is the most prevalent acquired muscle disease in the elderly. sIBM is an intractable and progressive disease of unknown cause and without effective treatment. The etiology of sIBM is still unknown; however, genetic factors, aging, lifestyles, and environmental factors may be involved. The purpose of this study is to elucidate the cross-sectional profile of patients affected by sIBM in Japan. Methods: We surveyed patient data for 146 cases diagnosed at a number of centers across Japan. We also issued a questionnaire for 67 patients and direct caregivers to further elucidate the natural history of the disease. Results: The mean age at the onset was 63.4 ± 9.2 years. The mean length of time from the onset to diagnosis was 55.52 ± 49.72 months, suggesting that there is a difficulty in diagnosing this disease with long-term consequences because of late treatment. 73 % described the psychological/mental aspect of the disease. The most popular primary caregiver was the patient’s spouse and 57 % patients mentioned that they were having problems managing the finances. Conclusions: Through these surveys, we described the cross-sectional profiles of sIBM in Japan. Many patients described psychological/mental and financial anxiety because of the aged profile of sIBM patients. The profiles of sIBM patients are similar to those in Western countries.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalOrphanet Journal of Rare Diseases
Issue number1
Publication statusPublished - 2016 Nov 8


  • Aging
  • Multicenter survey
  • Muscle disease
  • Questionnaire
  • Sporadic inclusion body myositis


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