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January 17, 2023; 100 (3) Research Article

Impact of Amyloid and Tau PET on Changes in Diagnosis and Patient Management

Sho Shimohama, Toshiki Tezuka, View ORCID ProfileKeisuke Takahata, Shogyoku Bun, Hajime Tabuchi, Morinobu Seki, Yuki Momota, Natsumi Suzuki, Ayaka Morimoto, Yu Iwabuchi, Masahito Kubota, Yasuharu Yamamoto, Yasunori Sano, Ryo Shikimoto, Kei Funaki, Yu Mimura, Yoshinori Nishimoto, Ryo Ueda, Masahiro Jinzaki, Jin Nakahara, Masaru Mimura, Daisuke Ito
First published September 29, 2022, DOI: https://doi.org/10.1212/WNL.0000000000201389
Sho Shimohama
From the Departments of Neurology (S.S., T.T., M.S., M.K., Y.N., J.N.), Neuropsychiatry (T.K., S.B., H.T., Yuki Momota, N.S., A.M., Y.Y., Y.S., R.S., K.F., Yu Mimura, M.M.), Radiology (Y.I., M.J.), Physiology (D.I.), and Memory Center (D.I.), Keio University School of Medicine, Tokyo; Department of Functional Brain Imaging (T.K.), Institute for Quantum Medical Science, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Chiba; and Office of Radiation Technology (R.U.), Keio University Hospital, Tokyo, Japan.
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Toshiki Tezuka
From the Departments of Neurology (S.S., T.T., M.S., M.K., Y.N., J.N.), Neuropsychiatry (T.K., S.B., H.T., Yuki Momota, N.S., A.M., Y.Y., Y.S., R.S., K.F., Yu Mimura, M.M.), Radiology (Y.I., M.J.), Physiology (D.I.), and Memory Center (D.I.), Keio University School of Medicine, Tokyo; Department of Functional Brain Imaging (T.K.), Institute for Quantum Medical Science, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Chiba; and Office of Radiation Technology (R.U.), Keio University Hospital, Tokyo, Japan.
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Keisuke Takahata
From the Departments of Neurology (S.S., T.T., M.S., M.K., Y.N., J.N.), Neuropsychiatry (T.K., S.B., H.T., Yuki Momota, N.S., A.M., Y.Y., Y.S., R.S., K.F., Yu Mimura, M.M.), Radiology (Y.I., M.J.), Physiology (D.I.), and Memory Center (D.I.), Keio University School of Medicine, Tokyo; Department of Functional Brain Imaging (T.K.), Institute for Quantum Medical Science, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Chiba; and Office of Radiation Technology (R.U.), Keio University Hospital, Tokyo, Japan.
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Shogyoku Bun
From the Departments of Neurology (S.S., T.T., M.S., M.K., Y.N., J.N.), Neuropsychiatry (T.K., S.B., H.T., Yuki Momota, N.S., A.M., Y.Y., Y.S., R.S., K.F., Yu Mimura, M.M.), Radiology (Y.I., M.J.), Physiology (D.I.), and Memory Center (D.I.), Keio University School of Medicine, Tokyo; Department of Functional Brain Imaging (T.K.), Institute for Quantum Medical Science, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Chiba; and Office of Radiation Technology (R.U.), Keio University Hospital, Tokyo, Japan.
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Hajime Tabuchi
From the Departments of Neurology (S.S., T.T., M.S., M.K., Y.N., J.N.), Neuropsychiatry (T.K., S.B., H.T., Yuki Momota, N.S., A.M., Y.Y., Y.S., R.S., K.F., Yu Mimura, M.M.), Radiology (Y.I., M.J.), Physiology (D.I.), and Memory Center (D.I.), Keio University School of Medicine, Tokyo; Department of Functional Brain Imaging (T.K.), Institute for Quantum Medical Science, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Chiba; and Office of Radiation Technology (R.U.), Keio University Hospital, Tokyo, Japan.
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Morinobu Seki
From the Departments of Neurology (S.S., T.T., M.S., M.K., Y.N., J.N.), Neuropsychiatry (T.K., S.B., H.T., Yuki Momota, N.S., A.M., Y.Y., Y.S., R.S., K.F., Yu Mimura, M.M.), Radiology (Y.I., M.J.), Physiology (D.I.), and Memory Center (D.I.), Keio University School of Medicine, Tokyo; Department of Functional Brain Imaging (T.K.), Institute for Quantum Medical Science, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Chiba; and Office of Radiation Technology (R.U.), Keio University Hospital, Tokyo, Japan.
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Yuki Momota
From the Departments of Neurology (S.S., T.T., M.S., M.K., Y.N., J.N.), Neuropsychiatry (T.K., S.B., H.T., Yuki Momota, N.S., A.M., Y.Y., Y.S., R.S., K.F., Yu Mimura, M.M.), Radiology (Y.I., M.J.), Physiology (D.I.), and Memory Center (D.I.), Keio University School of Medicine, Tokyo; Department of Functional Brain Imaging (T.K.), Institute for Quantum Medical Science, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Chiba; and Office of Radiation Technology (R.U.), Keio University Hospital, Tokyo, Japan.
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Natsumi Suzuki
From the Departments of Neurology (S.S., T.T., M.S., M.K., Y.N., J.N.), Neuropsychiatry (T.K., S.B., H.T., Yuki Momota, N.S., A.M., Y.Y., Y.S., R.S., K.F., Yu Mimura, M.M.), Radiology (Y.I., M.J.), Physiology (D.I.), and Memory Center (D.I.), Keio University School of Medicine, Tokyo; Department of Functional Brain Imaging (T.K.), Institute for Quantum Medical Science, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Chiba; and Office of Radiation Technology (R.U.), Keio University Hospital, Tokyo, Japan.
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Ayaka Morimoto
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Yu Iwabuchi
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Masahito Kubota
From the Departments of Neurology (S.S., T.T., M.S., M.K., Y.N., J.N.), Neuropsychiatry (T.K., S.B., H.T., Yuki Momota, N.S., A.M., Y.Y., Y.S., R.S., K.F., Yu Mimura, M.M.), Radiology (Y.I., M.J.), Physiology (D.I.), and Memory Center (D.I.), Keio University School of Medicine, Tokyo; Department of Functional Brain Imaging (T.K.), Institute for Quantum Medical Science, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Chiba; and Office of Radiation Technology (R.U.), Keio University Hospital, Tokyo, Japan.
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Yasuharu Yamamoto
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Yasunori Sano
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Ryo Shikimoto
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Kei Funaki
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Yu Mimura
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Yoshinori Nishimoto
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Ryo Ueda
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Masahiro Jinzaki
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Impact of Amyloid and Tau PET on Changes in Diagnosis and Patient Management
Sho Shimohama, Toshiki Tezuka, Keisuke Takahata, Shogyoku Bun, Hajime Tabuchi, Morinobu Seki, Yuki Momota, Natsumi Suzuki, Ayaka Morimoto, Yu Iwabuchi, Masahito Kubota, Yasuharu Yamamoto, Yasunori Sano, Ryo Shikimoto, Kei Funaki, Yu Mimura, Yoshinori Nishimoto, Ryo Ueda, Masahiro Jinzaki, Jin Nakahara, Masaru Mimura, Daisuke Ito
Neurology Jan 2023, 100 (3) e264-e274; DOI: 10.1212/WNL.0000000000201389

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Abstract

Background and Objectives Previous studies have evaluated the diagnostic effect of amyloid PET in selected research cohorts. However, these studies did not assess the clinical impact of the combination of amyloid and tau PETs. Our objective was to evaluate the association of the combination of 2 PETs with changes in diagnosis, treatment, and management in a memory clinic cohort.

Methods All participants underwent amyloid [18F]florbetaben PET and tau PET using [18F]PI-2620 or [18F]Florzolotau, which are potentially useful for the diagnosis of non-Alzheimer disease (AD) tauopathies. Dementia specialists determined a pre- and post-PET diagnosis that existed in both a clinical syndrome (cognitive normal [CN], mild cognitive impairment [MCI], and dementia) and suspected etiology, with a confidence level. In addition, the dementia specialists determined patient treatment in terms of ancillary investigations and management.

Results Among 126 registered participants, 84.9% completed the study procedures and were included in the analysis (CN [n = 40], MCI [n = 25], AD [n = 20], and non-AD dementia [n = 22]). The etiologic diagnosis changed in 25.0% in the CN, 68.0% in the MCI, and 23.8% with dementia. Overall changes in management between pre- and post-PET occurred in 5.0% of CN, 52.0% of MCI, and 38.1% of dementia. Logistic regression analysis revealed that tau PET has stronger associations with change management than amyloid PET in all participants and dementia groups.

Discussion The combination of amyloid and tau PETs was associated with changes in management and diagnosis of MCI and dementia, and the second-generation tau PET has a strong impact on the changes in diagnosis and management in memory clinics.

Classification of Evidence This study provides Class I evidence that the combination of amyloid and tau PETs was associated with changes in management and diagnosis of MCI and dementia.

Glossary

4R=
4-repeat;
Aβ=
β-amyloid;
AD=
Alzheimer disease;
ANOVA=
analysis of variance;
CBD=
corticobasal degeneration;
CBS=
corticobasal syndrome;
CDR=
Clinical Dementia Rating;
CI=
cognitively impaired participants;
CN=
cognitive normal;
FBB=
florbetaben;
FDA=
US Food and Drug Administration;
FTLD=
frontotemporal lobar degeneration;
GDS=
Geriatric Depression Scale;
GMP=
good manufacturing practices;
IDEAS=
Imaging Dementia-Evidence for Amyloid Scanning;
MCI=
mild cognitive impairment;
MMSE=
Mini-Mental State Examination;
PSP=
progressive supranuclear palsy;
SUVR=
standardized uptake value ratios;
TBI=
traumatic brain injury

Footnotes

  • Go to Neurology.org/N for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.

  • Submitted and externally peer reviewed. The handling editor was Linda Hershey, MD, PhD, FAAN.

  • Editorial, page 109

  • Class of Evidence: NPub.org/coe

  • Received June 8, 2022.
  • Accepted in final form August 26, 2022.
  • © 2022 American Academy of Neurology
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Neurology | Print ISSN:0028-3878
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