[What are the applications of biomarkers in ALS today?].
Numerous biomarkers studies in ALS used targeted and non-targeted approaches, to help for the diagnosis, the prognosis or to identify new pathophysiological ways. The emerging approaches such as "omics" studies are very promising, but the practical and technical limits do not enable their optimization. Even if some biomarkers such as cystatin C or glutamate are highlighted in ALS, to date, no biomarker is currently used in routine practice. Diffusion-based neuroimaging has emerged as a tool to identify the involvement of the central neuron, but a recent meta-analysis shows a poor sensitivity and specificity. Spinal cord imaging has the advantage of simultaneoulsy investigating both the corticospinal tract and the peripheral motor neurons in the anterior horns of the spinal cord. Its interest to provide biomarkers in ALS is illustrated by recent studies that used a multiparametric approach. The limits of biomarkers studies are principally based on small cohorts, involving a control population who does not allow to assess specificity. The discrepancies between the biomarkers identified in the different studies are based on a strong heterogeneity of the disease and a lack of standardization of the research methodology, including the step of the validation of these molecules in independent cohorts. The perspectives in biomarker research in ALS imply the combination of analytical methods, human abilities and harmonization of the strategies.
CHRU de Tours, laboratoire de biochimie et biologie moléculaire, 37044 Tours, France; Université François-Rabelais, unité Inserm U930 « neurogénétique et neurométabolomique », 37044 Tours, France. Electronic address: helene.blasco@univ-tours.fr.
Hélène
H
Blasco
Université François-Rabelais, unité Inserm U930 « neurogénétique et neurométabolomique », 37044 Tours, France; CHRU de Tours, service de neurologie, centre SLA, 37044 Tours, France.
Philippe
P
Corcia
Assistance publique-Hôpitaux de Paris, hôpital de la Salpêtrière, département des maladies du système nerveux, 75013 Paris, France; Sorbonne Universités, UPMC Université Paris 06, Inserm, CNRS, laboratoire d'imagerie biomédicale, 75005 Paris, France.
Pierre-François
PF
Pradat
D000690:Amyotrophic Lateral Sclerosis / Q000175:diagnosis*; D015415:Biomarkers / Q000032:analysis; D006801:Humans; D059906:Neuroimaging
D015415:Biomarkers