2026-04-17T11:51:06Zhttps://recercat.cat/oai/request

oai:recercat.cat:2072/4670572025-10-27T10:36:19Zcom_2072_98col_2072_378192

00925njm 22002777a 4500 dc Lantero-Rodríguez, Juan author Vrillon, Agathe author Fernández-Lebrero, Aida author Ortiz-Romero, Paula author Snellman, Anniina author Montoliu-Gaya, Laia author Brum, Wagner S. author Cognat, Emmanuel author Dumurgier, Julien author Puig-Pijoan, Albert author Navalpotro-Gómez, Irene author García-Escobar, Greta author Karikari, Thomas K. author Vanmechelen, Eugeen author Ashton, Nicholas J. author Zetterberg, Henrik author Suárez-Calvet, Marc author Paquet, Claire author Blennow, Kaj author 2023 Cerebrospinal fluid (CSF) p-tau235 is a novel biomarker highly specific of Alzheimer's disease (AD). However, CSF p-tau235 has only been studied in well-characterized research cohorts, which do not fully reflect the patient landscape found in clinical settings. Therefore, in this multicentre study, we investigated the performance of CSF p-tau235 to detect symptomatic AD in clinical settings and compared it with CSF p-tau181, p-tau217 and p-tau231. CSF p-tau235 was measured using an in-house single molecule array (Simoa) assay in two independent memory clinic cohorts: Paris cohort (Lariboisière Fernand-Widal University Hospital Paris, France; n =212) and BIODEGMAR cohort (Hospital del Mar, Barcelona, Spain; n =175). Patients were classified by the syndromic diagnosis (cognitively unimpaired [CU], mild cognitive impairment [MCI] or dementia) and their biological diagnosis (amyloid-beta [Aβ]+ or Aβ ). Both cohorts included detailed cognitive assessments and CSF biomarker measurements (clinically validated core AD biomarkers [Lumipulse CSF Aβ ratio, p-tau181 and t-tau] and in-house developed Simoa CSF p-tau181, p-tau217 and p-tau231). High CSF p-tau235 levels were strongly associated with CSF amyloidosis regardless of the clinical diagnosis, being significantly increased in MCI Aβ+ and dementia Aβ+ when compared with all other Aβ- groups (Paris cohort: P ˂0.0001 for all; BIODEGMAR cohort: P ˂0.05 for all). CSF p-tau235 was pronouncedly increased in the A+T+ profile group compared with A-T- and A+T- groups (P ˂0.0001 for all). Moreover, CSF p-tau235 demonstrated high diagnostic accuracies identifying CSF amyloidosis in symptomatic cases (AUCs=0.86 to 0.96) and discriminating AT groups (AUCs=0.79 to 0.98). Overall, CSF p-tau235 showed similar performances to CSF p-tau181 and CSF p-tau231 when discriminating CSF amyloidosis in various scenarios, but lower than CSF p-tau217. Finally, CSF p-tau235 associated with global cognition and memory domain in both cohorts. CSF p-tau235 was increased with the presence of CSF amyloidosis in two independent memory clinic cohorts. CSF p-tau235 accurately identified AD in both MCI and dementia patients. Overall, the diagnostic performance of CSF p-tau235 was comparable to that of other CSF p-tau measurements, indicating its suitability to support a biomarker-based AD diagnosis in clinical settings. The online version contains supplementary material available at 10.1186/s13195-023-01201-0. Alzheimer's disease CSF Biomarkers P-tau235 P-tau181 P-tau217 P-tau231 Memory clinic Clinical performance and head-to-head comparison of CSF p-tau235 with p-tau181, p-tau217 and p-tau231 in two memory clinic cohorts