Clinical Evaluation of 18F-PI-2620 as a Potent PET Radiotracer Imaging Tau Protein in Alzheimer Disease and Other Neurodegenerative Diseases Compared With 18F-THK-5351.
Clin Nucl Med
; 45(11): 841-847, 2020 Nov.
Article
in En
| MEDLINE
| ID: mdl-32910050
ABSTRACT
PURPOSE:
PET is a useful tool for detecting the presence and extent of brain tau accumulation. However, most first-generation tau PET tracers are limited for high off-target binding and detection of tau in non-Alzheimer disease (AD). This study evaluated potential clinical applications of F-PI-2620 as a novel PET tracer with a high binding affinity for tau deposition in AD and non-AD tauopathies.METHODS:
Twenty-six participants diagnosed with either mild cognitive impairment, probable AD, frontotemporal dementia, or parkinsonism, as well as healthy controls underwent a 60- to 90-minute brain PET scan after 7 mci (259 MBq) injection of F-PI-2620. Some participants had previous PET scans using F-THK-5351 or F-FP-CIT for dopamine transporter imaging.RESULTS:
All participants showed no increase in off-target binding in basal ganglia on F-PI-2620 PET images, as noted for first-generation tau tracers. Aß+ mild cognitive impairment or AD patients showed diverse cortical F-PI-2620 uptake in frontotemporoparietal cortex that correlated with Mini-Mental Status Examination (ρ = -0.692, P = 0.013). Aß+ Parkinson disease with dementia and (Aß unknown) primary progressive aphasia patients also showed increased F-PI-2620 uptakes in the frontotemporoparietal cortex. Patients with parkinsonism showed increased uptakes in the pallidum compared with Aß- healthy controls (left 1.41 ± 0.14 vs 1.04 ± 0.13, P = 0.014; right 1.18 ± 0.16 vs 0.95 ± 0.07, P = 0.014).CONCLUSIONS:
F-PI-2620 PET might be a sensitive tool to detect cortical tau deposits in patients with Aß+ AD and Aß+ non-AD tauopathies. Furthermore, this study showed that "off-target" binding in the basal ganglia does not affect F-PI-2620.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Quinolines
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Fluorine Radioisotopes
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Tau Proteins
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Positron-Emission Tomography
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Alzheimer Disease
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Aminopyridines
Limits:
Aged
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Female
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Humans
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Male
/
Middle aged
Language:
En
Journal:
Clin Nucl Med
Year:
2020
Document type:
Article