ADOPIC cognitive composites predict amyloid-related decline and progression to mild cognitive impairment

Researchers in the Alzheimer's Dementia Onset and Progression in International Cohorts (ADOPIC) study developed and validated data-driven cognitive composites to track amyloid beta (Aβ)-related cognitive decline. The observational analysis included 1,964 cognitively unimpaired participants at baseline, with 1,110 in the longitudinal subset. Principal component analysis-derived domain-specific and general cognition composites were assessed for psychometric properties, sensitivity to Aβ-related decline, and prediction of progression to mild cognitive impairment (MCI), using the ADCS-PACC as a comparator.

The composites showed good to excellent psychometric properties and differentiated cognitive trajectories associated with Aβ status (p < 0.001). The general cognition composite demonstrated longitudinal sensitivity comparable to the ADCS-PACC, with a reported effect size of d = −0.20, and equivalent classification performance, with an area under the receiver operating characteristic curve of 0.70. All composites significantly predicted MCI progression (p < 0.001).

These findings support the composites as potential outcome measures in preclinical Alzheimer's disease research, including domain-specific assessment. They do not establish superiority over the ADCS-PACC. Only the abstract was available; follow-up duration, MCI event counts, confidence intervals, and details of cohort validation were not provided, limiting assessment of predictive precision and applicability to individual clinical decisions.