Abstract
Background
The risk of developing progressive multifocal leukoencephalopathy in natalizumab-treated multiple sclerosis (MS) patients is related to serum anti-JCV antibody (JCVAb) index. However, the correlation of JCVAb index with other disease-modifying treatments (DMTs) is not well understood.
Objective
In this study, we investigated the JCVAb seropositivity rate/JCVAb indexes and its correlation with clinical profiles in Japanese MS patients, and the relationship between JCVAb indexes and DMTs.
Methods
JCVAb indexes were measured in 149 serum samples from 105 patients with MS. JCVAb indexes and seropositivity, and their correlation with age, sex, disease duration, Kurtzke expanded disability status scale and the duration of the DMTs were evaluated in each patient.
Results
JCVAb was positive in 73 of 105 MS patients. Within 40 fingolimod-treated patients, 27 were positive for JCVAb and JCVAb indexes were positively correlated with the duration of fingolimod treatment. No significant relation was found between JCVAb indexes and the duration of treatment for the other disease-modifying drugs.
Conclusion
JCVAb seropositivity was comparatively high in Japanese MS patients. Fingolimod treatment is likely to increase serum JCVAb index, possibly leading to the development of PML. Therefore, it is advised that JCVAb index should be serially monitored during fingolimod treatment to decrease PML risk.
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Abbreviations
- DMT:
-
Disease-modifying treatment
- EDSS:
-
Kurtzke expanded disability status scale
- JCV:
-
John Cunningham virus
- MS:
-
Multiple sclerosis
- PML:
-
Progressive multifocal leukoencephalopathy
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Acknowledgements
Part of this study was presented in a poster session at the 23rd WCN (World Congress of Neurology) held in Kyoto, Japan (September 2017).
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All patients provided informed consent prior to their inclusion to this study.
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The authors declare no conflicts of interest.
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This study was approved by the Ethics Committee of Chiba University School of Medicine (No.842) and all participants provided written informed consent.
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Aoyama, S., Mori, M., Uzawa, A. et al. Serum anti-JCV antibody indexes in Japanese patients with multiple sclerosis: elevations along with fingolimod treatment duration. J Neurol 265, 1145–1150 (2018). https://doi.org/10.1007/s00415-018-8813-z
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DOI: https://doi.org/10.1007/s00415-018-8813-z