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JOURNAL ARTICLE
MULTICENTER STUDY

Cognition and amyloid load in Alzheimer disease imaged with florbetapir F 18(AV-45) positron emission tomography

Paul B Rosenberg, D F Wong, S L Edell, J S Ross, A D Joshi, J R Brašić, Y Zhou, V Raymont, A Kumar, H T Ravert, R F Dannals, M J Pontecorvo, D M Skovronsky, C G Lyketsos
American Journal of Geriatric Psychiatry 2013, 21 (3): 272-8
23395194

OBJECTIVE: To examine the association between regional brain uptake of a novel amyloid positron emission tomography (PET) tracer florbetapir F 18 ([(18)F]-AV-45) and cognitive performance in a pilot study.

DESIGN: Cross-sectional comparison of [(18)F]-AV-45 in AD patients versus controls.

SETTING: Three specialty memory clinics.

PARTICIPANTS: Eleven participants with probable Alzheimer disease (AD) by NINDS/ADRDA criteria and 15 healthy comparison (HC) participants.

MEASUREMENTS: Participants underwent PET imaging following a 370 MBq (10 mCi) intravenous administration of [(18)F]-AV-45. Regional/cerebellar standardized uptake value ratios (SUVRs) were calculated. Cognition was assessed using Mini-Mental State Examination, Alzheimer's Disease Assessment Scale-Cognitive subscale (ADAS-Cog), Wechsler Logical Memory IA (immediate recall) test (LMIA), and verbal category fluency.

RESULTS: Greater [(18)F]-AV-45 SUVR was associated with poorer performance on all cognitive tests. In the HC group, occipital, parietal, precuneus, temporal, and cortical average SUVR was associated with greater ADAS-Cog, and greater anterior cingulate SUVR was associated with lower LMIA. Two HC participants had [(18)F]-AV-45 cortical/cerebellar SUVR greater than 1.5, one of whom had deficits in episodic recall and on follow-up met criteria for amnestic mild cognitive impairment.

CONCLUSION: [(18)F]-AV-45 SUVR in several brain regions was associated with worse global cognitive performance particularly in HC, suggesting its potential as a marker of preclinical AD.

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