Abstract
Background
It has long been known that the majority of patients with multiple sclerosis (MS) display an intrathecal, polyspecific humoral immune response to a broad panel of neurotropic viruses. This response has measles virus, rubella virus and varicella zoster virus as its most frequent constituents and is thus referred to as the MRZ reaction (MRZR).
Objective
Re-evaluation of the specificity of MRZR as a marker of MS.
Methods
Structured review of the existing English-, German- and Spanish-language literature on MRZR testing, with evaluation of MRZR in a cohort of 43 unselected patients with MS and other neurological diseases as a proof of principle.
Results
A positive MRZ reaction, defined as a positive intrathecal response to at least two of the three viral agents, was found in 78% of MS patients but only in 3% of the controls (p < 0.00001), corresponding to specificity of 97%. Median antibody index values were significantly lower in non-MS patients (measles, p < 0.0001; rubella, p < 0.006; varicella zoster, p < 0.02). The 30 identified original studies on MRZR reported results from 1478 individual MRZR tests. A positive MRZR was reported for 458/724 (63.3%) tests in patients with MS but only for 19/754 (2.5%) tests in control patients (p < 0.000001), corresponding to cumulative specificity of 97.5% (CI 95% 96–98.4), cumulative sensitivity of 63.3% (CI 95% 59.6–66.8) (or 67.4% [CI 95% 63.5–71.1] in the adult MS subgroup), a positive likelihood ratio of 25.1 (CI 95% 16–39.3) and a negative likelihood ratio of 0.38 (CI 95% 0.34–0.41). Of particular note, MRZR was absent in 52/53 (98.1%) patients with neuromyelitis optica or MOG-IgG-positive encephalomyelitis, two important differential diagnoses of MS.
Conclusion
MRZR is the most specific laboratory marker of MS reported to date. If present, MRZR substantially increases the likelihood of the diagnosis of MS. Prospective and systematic studies on the diagnostic and prognostic impact of MRZR testing are highly warranted.
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Abbreviations
- ADEM:
-
Acute disseminated encephalomyelitis
- AI:
-
Antibody index
- APL:
-
Antiphospholipid syndrome
- CI:
-
Confidence interval
- CNS:
-
Central nervous system
- EBV:
-
Epstein–Barr virus
- HIV:
-
Human immunodeficiency virus
- HSV:
-
Herpes simplex virus
- HTLV-1:
-
Human T-lymphotropic virus 1
- IgG:
-
Immunoglobulin G
- M:
-
Measles virus
- MRZR:
-
Measles virus, rubella virus, and varicella zoster virus reaction
- MS:
-
Multiple sclerosis
- NB:
-
Neuroborreliosis
- NDT:
-
Not detectable
- NIND:
-
Non-inflammatory neurological disorders
- nLR:
-
Negative likelihood ratio
- NMO:
-
Neuromyelitis optica
- OIND/CNS:
-
Other inflammatory neurological disorders of the CNS
- OND:
-
Other neurological disorders
- RD/CNS:
-
Rheumatic disorders with CNS involvement
- pLR:
-
Positive likelihood ratio
- PND:
-
Paraneoplastic neurological disorders
- Q:
-
Quotient
- R:
-
Rubella virus
- SLE:
-
Systemic lupus erythematosus
- Z or VZV:
-
Varicella zoster virus
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Acknowledgements
This work was supported by a research fellowship from the European Committee for Treatment and Research in Multiple Sclerosis (ECTRIMS) to SJ, by a research fellowship from the European Neurological Society (ENS) to SJ, and by research grants from Bayer Healthcare, from the Dietmar Hopp Foundation, and from MerckSerono to BW. We are grateful to Mrs D. Menzel, Mrs R. Herbst, Mrs M. Hoehne and Mrs H. Pahl, Department of Clinical Chemistry, Ludwig Maximilian University, Munich, Germany, and to Mrs Annemarie Eschlbeck, Department of Neurology, University of Heidelberg, Germany, for excellent technical assistance.
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Jarius, S., Eichhorn, P., Franciotta, D. et al. The MRZ reaction as a highly specific marker of multiple sclerosis: re-evaluation and structured review of the literature. J Neurol 264, 453–466 (2017). https://doi.org/10.1007/s00415-016-8360-4
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DOI: https://doi.org/10.1007/s00415-016-8360-4