Premium
Biological heterogeneity in ADNI amnestic mild cognitive impairment
Author(s) -
Nettiksimmons Jasmine,
DeCarli Charles,
Landau Susan,
Beckett Laurel
Publication year - 2014
Publication title -
alzheimer's and dementia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.713
H-Index - 118
eISSN - 1552-5279
pISSN - 1552-5260
DOI - 10.1016/j.jalz.2013.09.003
Subject(s) - alzheimer's disease neuroimaging initiative , atrophy , neuroimaging , biomarker , cognitive impairment , cognition , magnetic resonance imaging , psychology , cluster (spacecraft) , alzheimer's disease , disease , medicine , neuroscience , oncology , biology , biochemistry , radiology , computer science , programming language
Background Previous work examining normal controls from the Alzheimer's Disease Neuroimaging Initiative (ADNI) identified substantial biological heterogeneity. We hypothesized that ADNI mild cognitive impairment (MCI) subjects would also exhibit heterogeneity with possible clinical implications. Methods ADNI subjects diagnosed with amnestic MCI ( n = 138) were clustered based on baseline magnetic resonance imaging, cerebrospinal fluid, and serum biomarkers. The clusters were compared with respect to longitudinal atrophy, cognitive trajectory, and time to conversion. Results Four clusters emerged with distinct biomarker patterns: The first cluster was biologically similar to normal controls and rarely converted to Alzheimer's disease (AD) during follow‐up. The second cluster had characteristics of early Alzheimer's pathology. The third cluster showed the most severe atrophy but barely abnormal tau levels and a substantial proportion converted to clinical AD. The fourth cluster appeared to be pre‐AD and nearly all converted to AD. Conclusions Subjects with MCI who were clinically similar showed substantial heterogeneity in biomarkers.