Description

Alzheimer's disease (AD) is a leading cause for individual and caregiver burden associated with neurodegenerative diseases (NDs) in an aging population, afflicting + 35 million people worldwide, and spiraling costs. Major advances have been made during the last 20 years in the understanding of AD pathophysiological process. It is now well demonstrated that the course of the disease extend over more than 20 years with long pre and pauci-symptomatic periods.

A major need and challenge in translational research on Alzheimer's disease (AD) is to predict disease progression rate and/or time to clinical conversion, notably in the early phases of the AD process, such as mild cognitive impairment (MCI). Current markers such as Aß and tau species measured in cerebrospinal fluid (CSF) can differentiate AD from control and are currently used in daily clinical practice to assess presence of AD pathological process in patients with cognitive complaints. However, they do not account for cellular compensation and resistance mechanisms, the so-called "resilience" process.

Consequently, both prediction of AD progression in single patients and personalized adaptation of management and treatment remain highly limited. Moreover, there is an important unmet need regarding targeted prevention.

AD-Resilience is a translational research study funded by Agence Nationale pour la Recherche (ANR) and Direction Générale de l'Organisation des Soins (DGOS) that aims at identifying and validating markers of the biological processes underlying the mechanisms of brain resilience toward AD pathological process. Using blood samples, the investigators will produce the molecular-profile data that are needed to assess the resilience and brain homeostasis status of patients facing the AD process. Results will be processed using high-end machine learning (ML) to overcome the limitations associated with sub-optimal reliability and precision of dimensional data analysis.

These biomarkers will be identified using data and samples from an already available nationwide research cohort (BALTAZAR). In order to ensure validity and facilitate transfer to clinical practice, results from this preliminary study will have to be confirmed in an independent, prospective cohort of patients reflecting the full spectrum and real-life heterogeneity of AD.

For this purpose, BioCogBankAD study aims at building this validation cohort. 244 patients with MCI or early dementia due to AD will be recruited in the present study and prospectively followed during three years. Blood samples (plasma, DNA and PaxGen) will be taken from these patients in order to measure the biomarkers previously identified in the exploratory study. Clinical follow-up including including standardized neuropsychological examination and blood sampling (plasma) will be performed annually.