• Wei-Wei Li, Ying-Ying Shen, Ding-Yuan Tian, Xian-Le Bu, Fan Zeng, Yu-Hui Liu, Yang Chen, Xiu-Qing Yao, Hui-Yun Li, Dong-Wan Chen, Fa-Ying Zhou, Heng Yang, Qi-Ming Li, Wei-Qi Bao, Yi-Hui Guan, Hua-Dong Zhou, Rong-Bing Jin, and Yan-Jiang Wang.
• Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China.
• J. Alzheimers Dis. 2019 Jan 1; 69 (1): 169-178.

AbstractBrain amyloid-β (Aβ) deposition is a hallmark to define Alzheimer's disease (AD). We investigated the positive rate of brain amyloid deposition assessed with 11C-Pittsburgh compound (PiB)-PET and blood Aβ levels in a cohort of probable AD patients who were diagnosed according to the 1984 NINCDS-ADRDA criteria. Eighty-four subjects with a clinical diagnosis of probable AD dementia, amnestic mild cognitive impairment (MCI), and cognitively normal (CN) status were subjected to PiB-PET and 18F-fluorodeoxyglucose (FDG)-PET scans. Plasma biomarkers of Aβ42, Aβ40, and T-tau were measured using single molecule array technology. The positive rate of PiB-PET, the associations between PiB-PET status and FDG-PET, plasma biomarkers, and clinical manifestations were analyzed. PiB-PET was positive in 77.36% of probable AD patients, 31.80% of MCI patients, and 0 of NC. Plasma Aβ42/Aβ40 ratio was associated with PiB-PET, the ROC curve analysis revealing an AUC of 0.77 (95% CI: 0.66-0.87), with a sensitivity of 82% and specificity of 64%. Some clinical manifestations were associated with PiB-PET imaging. Our findings indicate that only three-fourths of patients diagnosed with probable AD fit the pathological criteria, suggesting that we should be cautious regarding the accuracy of AD diagnosis when no biomarker evidence is available in our clinical practice.

37 keywords...

hide…