Anti-SS-A/Ro antibody positivity as a risk factor for relapse in patients with polymyositis/dermatomyositis

Noriko Tatebe, Kenei Sada, Yosuke Asano, Sonia Zeggar, Sumie Hiramatsu, Yoshia Miyawaki, Keiji Ohashi, Michiko Morishita, Takayuki Katsuyama, Eri Katsuyama, Haruki Watanabe, Mariko Narazaki, Katsue Watanabe, Tomoko Kawabata, Jun Wada

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Abstract

Objective: The objective of this study is to elucidate predictors of relapse in patients with polymyositis and dermatomyositis (PM/DM). Methods: Fifty PM/DM patients who achieved disease stabilization at Okayama University Hospital in 2004–2014 were enrolled retrospectively. Candidate predictors such as demographic factors, clinical symptoms, laboratory data, and treatment status were compared. Results: The mean age of enrolled patients was 58 years; 34 were female. The patient groupings were as follows: 21 with PM, 27 with DM, and two with clinically amyopathic DM. During a mean observation period of 685 d, 5 patients (10%) died and 20 (40%) relapsed. The relapsed patients displayed baseline muscle weakness less frequently (85% versus 100%, p = .03) and anti-SS-A/Ro antibody more frequently (65% versus 27%, p = .007). Anti-SS-A/Ro-positive patients exhibited a higher relapse rate than anti-SS-A/Ro-negative patients (log-rank test, p = .03). Anti-SS-A/Ro-positive patients also exhibited higher anti-Jo-1 antibody positivity and lower levels of serum complement. After adjusting anti-Jo-1 antibody positivity, age, sex, CK <500 IU/L, and lung involvement, anti-SS-A/Ro positivity was still an independent risk factor for higher relapse-rate (odds ratio, 5.5; 95% confidence interval, 1.4–25.1). Conclusions: Anti-SS-A/Ro antibody positivity may be a useful biomarker for prediction of relapse.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalModern Rheumatology
DOIs
Publication statusAccepted/In press - May 2 2017

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Keywords

  • Anti-SS-A/Ro antibodies
  • dermatomyositis
  • polymyositis

ASJC Scopus subject areas

  • Rheumatology

Cite this

Tatebe, N., Sada, K., Asano, Y., Zeggar, S., Hiramatsu, S., Miyawaki, Y., Ohashi, K., Morishita, M., Katsuyama, T., Katsuyama, E., Watanabe, H., Narazaki, M., Watanabe, K., Kawabata, T., & Wada, J. (Accepted/In press). Anti-SS-A/Ro antibody positivity as a risk factor for relapse in patients with polymyositis/dermatomyositis. Modern Rheumatology, 1-6. https://doi.org/10.1080/14397595.2017.1317377