A δ Homolog for Dementia Case Finding with Replication in the Alzheimer's Disease Neuroimaging Initiative.

Journal Article (Journal Article)

Dementia can be empirically described by the latent dementia phenotype "δ" and its various composite "homologs". We have explored δ's blood-based protein biomarkers in the Texas Alzheimer's Research and Care Consortium (TARCC) study. However, it would be convenient to replicate those associations in the Alzheimer's Disease Neuroimaging Initiative (ADNI). To this end, we have engineered a δ homolog from observed cognitive performance measures common to both projects. Our findings were replicated in randomly selected 50% splits of TARCC data (Group 1, N = 1,747; Group 2, N = 1,755), and then independently in ADNI (N = 1,737). The new δ homolog, i.e., "dT2A" (d-TARCC to ADNI), fit the data of both studies well, and was strongly correlated with dementia severity, as rated by the Clinical Dementia Rating Scale "sum of boxes" (TARCC: r = 0.99, p < 0.001; ADNI: r = 0.96, p < 0.001). dT2A achieved an area under the receiver operating characteristic curve of 0.981 (0.976-0.985) for the discrimination of Alzheimer's disease from normal controls in TARCC, and 0.988 (0.983-0.993) in ADNI. dT2A is the 12th δ homolog published to date, and opens the door to independent replications across these and similar studies.

Full Text

Duke Authors

Cited Authors

  • Royall, DR; Palmer, RF; Alzheimer’s Disease Neuroimaging Initiative,

Published Date

  • 2019

Published In

Volume / Issue

  • 67 / 1

Start / End Page

  • 67 - 79

PubMed ID

  • 30507569

Electronic International Standard Serial Number (EISSN)

  • 1875-8908

Digital Object Identifier (DOI)

  • 10.3233/JAD-171053


  • eng

Conference Location

  • Netherlands