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- W2896801306 abstract "We previously demonstrated that a cerebral white matter reference region could improve the ability of longitudinal florbetapir standard uptake value (SUV) ratios (SUVR) to track changes in amyloid-β (Aβ) levels (Chen et al., 2015). Here we sought to compare white matter to two candidate reference regions to test their the ability to detect Aβ elevations and associations with age and memory decline with cross-sectional florbetapir SUVRs in Presenilin (PSEN1) E280A mutation carriers from the Colombian Autosomal Dominant Alzheimer's Disease (ADAD) kindred. Cerebral white matter (corpus callosum[CC], centrum semi-ovale[CSO], and combined[WM]), cerebellar, and pontine reference regions were used to compute cerebral-to-reference region SUVRs using florbetapir PET scans acquired as reported (Fleisher et al., 2012). Nineteen cognitively unimpaired mutation carriers (mean age=32), 11 impaired mutation carriers (mean age=47), and 20 age-matched non-carriers of the PSEN1 mutation were included in the analyses. We compared the ability of different reference regions to detect elevated SUVRs and characterize associations with age and memory performance in the carrier group. Finally, since deceased mutation carriers with cognitive impairment are known to have neuropathological evidence of Aβ burden in the cerebellum, we compared reference region SUVs between our three groups. There were significant between-group SUVR differences (impaired carriers>unimpaired carriers>non-carriers) using each of the five reference regions. All reference regions similarly detected elevated levels of Aβ, and showed significant associations of SUVRs with age and worse memory performance in mutation carriers. However, associations with memory performance were stronger when using CC (p=0.02), CSO (p=.002), and WM reference regions (p=.06) compared to pontine. In comparison with impaired mutation carriers and non-carriers, SUVs were significantly greater in impaired mutation carriers in the cerebellar region, but not in white matter or pontine regions. Use of a white matter reference region may increase the ability to characterize cross-sectional florbetapir PET measurements of Aβ burden in ADAD mutation carriers, aid in identifying individuals at preclinical stages, and better inform future clinical trials. While our previously employed pontine reference region may be an acceptable alternative, a cerebellar reference region may be confounded by Aβ burden in the clinical stages of ADAD." @default.
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- W2896801306 date "2018-07-01" @default.
- W2896801306 modified "2023-10-16" @default.
- W2896801306 title "IC‐P‐010: COMPARING CEREBRAL WHITE MATTER, CEREBELLAR, AND PONTINE REFERENCE REGIONS TO CHARACTERIZE FLORBETAPIR PET MEASUREMENTS OF AMYLOID‐β BURDEN IN PSEN1 E280A MUTATION CARRIERS AND NONCARRIERS FROM THE COLOMBIAN AUTOSOMAL DOMINANT ALZHEIMER'S DISEASE KINDRED" @default.
- W2896801306 doi "https://doi.org/10.1016/j.jalz.2018.06.2074" @default.
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