Anti-HMGCR antibodies demonstrate high diagnostic value in the diagnosis of immune-mediated necrotizing myopathy following statin exposure

O. Shovman, B. Gilburd, C. Chayat, A. Dortort Lazar, H. Amital, M. Blank, C. Bentow, M. Mahler, Y. Shoenfeld

Research output: Contribution to journalArticlepeer-review

Abstract

Anti-HMGCR antibodies represent a characteristic serological feature of statin-exposed and statin-unexposed patients with immune-mediated necrotizing myopathy (IMNM). We assessed anti-HMGCR antibodies in patients with suspected IMNM following statin exposure and patients with other autoimmune rheumatic diseases. We evaluated the presence of anti-HMGCR autoantibodies in sera samples from 13 statin-exposed patients who were suspected of having IMNM, 38 patients with different inflammatory and autoimmune rheumatic diseases and 29 healthy subjects. The autoantibodies were evaluated by two assays: a new chemiluminescence QUANTA Flash HMGCR kit utilizing BIO-FLASH system and QUANTA Lite® HMGCR ELISA kit. Twelve samples from patients with suspicion for IMNM were found positive for anti-HMGCR antibodies by both assays. Only one of the 13 samples that were found positive by ELISA was negative by CIA. A very good qualitative correlation (κ = 0.95; 95 % CI 0.85–1.0) and quantitative agreement (Spearman’s rho 0.87; P value < 0.0001; 95 % CI 0.62–0.96) were found between these two assays. All samples from healthy subjects and from the disease-controlled patient cohort were negative for anti-HMGCR antibodies. In comparison with ELISA results, the CIA exhibited high sensitivity and specificity values of 92.3 and 100 %, respectively. Receiver operating characteristic analysis for CIA and ELISA yielded area under the curve values of 0.99. The presence of anti-HMGCR antibodies may be a useful biomarker of IMNM in statin-exposed patients. There is a good correlation between the two anti-HMGCR antibody assays evaluated in the present study.

Original languageEnglish
Pages (from-to)276-281
Number of pages6
JournalImmunologic Research
Volume65
Issue number1
DOIs
StatePublished - 1 Feb 2017

Keywords

  • Anti-HMGCR antibodies
  • Autoantibodies
  • Immune-mediated necrotizing myopathy (IMNM)
  • Myositis
  • Statins

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