Abstract
Late-onset Niemann-Pick type C (NP-C) is a rare, underdiagnosed lysosomal disease with neurological manifestations. A specific treatment, miglustat, can stabilize the disease if given early. Recently, three plasma screening biomarkers (PSBs) were developed [cholestane3β,5α,6βtriol (C-triol), 7-ketocholesterol (7-KC), and lysosphingomyelin-509 (LSM-509)], allowing a simpler and quite robust screening of patients suitable for genetic testing. The objective of our study was to evaluate practical utility and feasibility of large-scale PSB screening for NP-C in selected adult patients. Patients were prospectively enrolled if they showed, starting from 12 years of age, at least one of the three initial neuro-psychiatric manifestations described in NP-C: (1) gait disorder (cerebellar and/or dystonic); (2) cognitive decline with frontal lobe syndrome; (3) atypical psychosis. PSBs were measured in plasma of all patients and, if positive (LSM-509 and/or C-triol + 7-KC elevated), sequencing of NPC1 and NPC2 genes was performed. A total of 251 patients [136 males, 115 females; median age 42.1 (range 12.2–85.6) years] were screened. Six patients had positive PSBs. Two were confirmed to have NP-C (0.8% diagnostic yield, both with all three PSBs highly increased, especially LSM-509). False-positive rate was 1.2%, which was identical if only considering LSM-509. By contrast, false-positive rates were 8.1% and 5.7% for 7-KC and C-triol, respectively. We showed that selecting patients with neurologic and/or psychiatric symptoms consistent with NP-C for large-scale PSB screening is a simple and valid strategy to identify new adult NP-C patients, and would probably lead to earlier diagnosis and treatment administration if widely applied.
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We thank Actelion pharmaceutical and Claudia Bertonati for the financial support of this study.
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DM contributed to acquisition and analysis of data and drafting of the most part of manuscript and figures. MP, ILB, CE, AM, GC, AC, AD, AA, CM, MA, CT, NM, CRJ, JL, MS, LH, PE, SB, CG, DW, CP, MP, SB, and FL contributed to acquisition and analysis of data. YN contributed to conception and design of the study, acquisition and analysis of data, and drafting a significant portion of manuscript and figures.
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Dr Marion Plaze, Mathieu Anheim, Cécile Pagan, Cyril Goizet, and Yann Nadjar received travel grants and/or honoraria from Actelion Pharmaceuticals, which manufactures the drug Miglustat, used in NP-C; Mathieu Anheim also received honoraria and/or grants from Johnson and Johnson which is now part of Actelion Pharmaceuticals. Dr Daniele Mandia, Caroline Moreau, Isabelle Le Ber, Claire Ewenczyk, Alexandre Morin, Guilhem Carle, Angèle Consoli, Adrian Degardin, Ali Amad, Mathieu Anheim, Christine Tranchant, Nicolas Mélé, Carole Roue Jagot, Julien Lagarde, Marie Sarazin, Lorraine Hamelin, Pierre Ellul, Soumeya Bekri, Serge Belliard, David Wallon, and Foudil Lamari report no conflicts of interests relevant to this manuscript.
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Mandia, D., Plaze, M., Le Ber, I. et al. High diagnostic value of plasma Niemann-Pick type C biomarkers in adults with selected neurological and/or psychiatric disorders. J Neurol 267, 3371–3377 (2020). https://doi.org/10.1007/s00415-020-10020-4
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DOI: https://doi.org/10.1007/s00415-020-10020-4