Abstract
The risk of progressive multifocal leukoencephalopathy (PML) in patients treated with natalizumab for multiple sclerosis (MS) is a serious concern. The presence of anti-JC virus antibodies is a risk factor for PML development, but 2.5 % of the patients result falsely-negative, while the prognostic relevance of testing JCV-DNA in biological fluids of treated patients is debated. Aim of this work was to evaluate the utility of testing JCV-DNA, together with anti-JCV antibodies, in biological samples of treated patients as a tool for PML risk stratification. 126 subjects from 5 MS Centers in Italy were included in the study. We performed a cross-sectional study in 63 patients testing JCV-DNA in blood, peripheral blood cells and urine. We longitudinally assessed the presence of JCV-DNA in a cohort of 33 subjects, one of which developed PML. We could test retrospectively serum samples from another PML case occurred during natalizumab therapy. Anti-JCV antibodies and urinary JCV-DNA were both tested in 73 patients. No changes in JCV-DNA status occurred during natalizumab treatment. The subject who developed PML in the longitudinal cohort had detectable JCV-DNA in urine at all time-points while serum or blood from both PML patients were always negative before the onset of disease and, in one case, after. Four subjects with JCV-DNA in urine and undetectable anti-JCV antibodies were retested for anti-JCV antibodies and three out of four resulted positive. In conclusion, testing JCV-DNA in urine is complementary to testing anti-JCV antibodies in identifying patients at risk of PML.
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Acknowledgments
This work was partially supported by Italian Ministry of Health, grant CCM 2009
A. Laroni work was supported by a grant from Fondazione Italiana Sclerosi Multipla, FISM 2009 (Prot. N. 297/09/F14)
Conflict of interest
Laroni A. received honoraria for speaking by Biogen-Dompé, received funding for travel from Bayer-Schering, Biogen-Dompé, Merck Serono, and Sanofi Aventis and a grant from Fondazione Italiana Sclerosi Multipla.
Giacomazzi C.G., declares no conflict of interest
Grimaldi L. served on a scientific advisory board for Merck Serono; has received funding for travel or speaker honoraria from Merck Serono, Biogen-Dompé, Sanofi- Aventis, Bayer Schering, and Solvay Pharmaceuticals, Inc.; has received institutional research support from Teva, Biogen Idec, Genzyme Corporation, Sanofi-Aventis, Merck Serono, Novartis, and Eisai Inc.; has received research support from Merck Serono, Biogen-Dompé, and Ministero della Salute
Gallo P. has been a member of scientific boards supported by Novartis, Biogen-Elan, Merck Serono, Sanofi-Aventis, and Bayer-Schering; has been a consultant for Biogen-Elan, Sanofi-Aventis, and Bayer-Schering; has given expert testimony for Biogen-Dompé Italy, Sanofi-Aventis, and Merck Serono; has received honoraria from Novartis Farma, Biogen-Elan, Sanofi-Aventis, Merck Serono, and Bayer-Schering; and has had travel/accommodations expenses covered or reimbursed by University of Padova, Novartis Farma, Sanofi-Aventis, Biogen-Dompé Italy, Merck Serono, and Bayer-Schering
Sormani MP. serves on a scientific advisory board for Biogen Idec; has received funding for travel and speaker honoraria from Merck Serono; has served as a consultant to Actelion Pharmaceuticals Ltd., Merck Serono and Biogen Idec; and serves on speakers’ bureaus for Teva Pharmaceutical Industries Ltd., Merck Serono, and Biogen Idec.
Bertolotto A has been on steering committees in clinical trials sponsored by Biogen Idec, Roche; has received speaker honoraria from Biogen Idec, Merck Serono, Teva, Bayer Schering, Sanofi-Aventis, and Novartis; has been a member of scientific boards supported by Allergan, Almirall; has received research support from Biogen Idec, Bayer Schering, Merck Serono, Sanofi-Aventis, and from the Italian Multiple Sclerosis Society.
Gandoglia I., has received funding for travel by Sanofi Aventis
McDermott JL declares no conflict of interest
Martini I., declares no conflict of interest
Vitello G. declares no conflict of interest
Rinaldi F. received honoraria for speaking by Biogen-Dompé, received funding for travel fom Biogen-Dompé, Sanofi Aventis and Novartis
Barzon L., declares no conflict of interest
Militello V. declares no conflict of interest
Pizzorno M. declares no conflict of interest
Bandini F. declares no conflict of interest
Capello E. received honoraria for speaking by Biogen-Dompé and Innogenetics; received funding for travel fom Biogen-Dompé, Merck Serono, Sanofi-Aventis and Novartis
Palù G, declares no conflict of interest
Uccelli A., received financial support honoraria for consultation, speaking or both at meeting for Biogen Idec, Biogen-Dompé, Genetech, Roche, Allergan, Merck Serono, Bayer-Schering, Novartis and Sanofi-Aventis. He also received financial support for research form Fondazione Italiana Sclerosi Multipla, Fondazione CARIGE, Fondazione CARIPLO, the Italian Ministry of Health (Ricerca Finalizzata), the Italian Ministry of the University and Scientific Research (MIUR), the “Regione Liguria” (Limonte Project) and Merck Serono.
Mancardi G.L. received financial support for research, honoraria for consultation, speaking or both at meeting for Bayer-Schering, Biogen-Idec, Sanofi-Aventis and Merck Serono, the Fondazione Italiana Sclerosi Multipla (FISM), the Italian Ministry of Health (Ricerca Finalizzata), the Italian Ministry of the University and Scientific Research (MIUR) and the Fondazione CARIGE.
Varnier O.E. reports no disclosures. Received financial support for research from Biogen-Idec and the Italian Ministry of Health
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Laroni, A., Giacomazzi, C.G., Grimaldi, L. et al. Urinary JCV-DNA Testing during Natalizumab Treatment May Increase Accuracy of PML Risk Stratification. J Neuroimmune Pharmacol 7, 665–672 (2012). https://doi.org/10.1007/s11481-012-9366-z
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DOI: https://doi.org/10.1007/s11481-012-9366-z