Abstract
AbstractBackgroundDown syndrome (DS) is an important population to include in clinical trials aiming to prevent or delay Alzheimer’s disease (AD). This talk will summarise previous work in trajectory modelling to identify the earliest ages of change in cognition and the optimal sample sizes needed for clinical trials in DS. It will present validate data on the new version of the Cambridge Cognitive Examination–Down syndrome version II (CAMCOG‐DS‐II) alongside established cognitive tests. The CAMCOG‐DS‐II has been developed to assess cognitive impairments associated with dementia in people with DS.MethodThis was an observational, multicentre, longitudinal study (n = 174) across seven existing cohorts in six different European languages to validate cognitive tests in adults with DS aged 25 years and older. It assessed the relationships between tests of cognition, behaviour, function, and health. Cognitive assessments included the CAMCOG‐DS‐II, the CANTAB Paired Associates Learning (PAL) Task, the modified Cued Recall Test (mCRT) and the Purdue Pegboard Test. We examined correlations between tests, group differences between those with and without dementia and explored test‐retest reliability of the CAMCOG‐DS‐II.ResultOur results showed that completion rates for the CAMCOG‐DS‐II were high, and floor and ceiling effects were low. The CAMCOG‐DS‐II memory sub‐score correlated significantly with the mCRT total recall score (Spearman’s ∼0.5), and the praxis sub‐score significantly correlated with the Purdue Pegboard total score (Spearman’s >0.7).ConclusionThere is currently a critical lack of suitable diagnostic and outcome measures that can be used in clinical trials. These results show that the CAMCOG‐DS‐II is a feasible test of cognition and will help to provide sensitive cognitive endpoints for clinical trials which are seeking to find suitable treatments for AD in adults with DS. Future analysis will include trajectories of change from baseline to one year of follow up for each primary outcome measure.
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