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Teng E, Manser PT, Sanabria Bohorquez S, Wildsmith KR, Pickthorn K, Baker SL, Ward M, Kerchner GA, Weimer RM. Baseline [ 18F]GTP1 tau PET imaging is associated with subsequent cognitive decline in Alzheimer's disease. Alzheimers Res Ther 2021; 13:196. [PMID: 34852837 PMCID: PMC8638526 DOI: 10.1186/s13195-021-00937-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 11/16/2021] [Indexed: 12/14/2022]
Abstract
Background The role and implementation of tau PET imaging for predicting subsequent cognitive decline in Alzheimer’s disease (AD) remains uncertain. This study was designed to evaluate the relationship between baseline [18F]GTP1 tau PET and subsequent longitudinal change across multiple cognitive measures over 18 months. Methods Our analyses incorporated data from 67 participants, including cognitively normal controls (n = 10) and β-amyloid (Aβ)-positive individuals ([18F] florbetapir Aβ PET) with prodromal (n = 26), mild (n = 16), or moderate (n = 15) AD. Baseline measurements included cortical volume (MRI), tau burden ([18F]GTP1 tau PET), and cognitive assessments [Mini-Mental State Examination (MMSE), Clinical Dementia Rating (CDR), 13-item version of the Alzheimer’s Disease Assessment Scale-Cognitive Subscale (ADAS-Cog13), and Repeatable Battery for the Assessment of Neuropsychological Status (RBANS)]. Cognitive assessments were repeated at 6-month intervals over an 18-month period. Associations between baseline [18F]GTP1 tau PET indices and longitudinal cognitive performance were assessed via univariate (Spearman correlations) and multivariate (linear mixed effects models) approaches. The utility of potential prognostic tau PET cut points was assessed with ROC curves. Results Univariate analyses indicated that greater baseline [18F]GTP1 tau PET signal was associated with faster rates of subsequent decline on the MMSE, CDR, and ADAS-Cog13 across regions of interest (ROIs). In multivariate analyses adjusted for baseline age, cognitive performance, cortical volume, and Aβ PET SUVR, the prognostic performance of [18F]GTP1 SUVR was most robust in the whole cortical gray ROI. When AD participants were dichotomized into low versus high tau subgroups based on baseline [18F]GTP1 PET standardized uptake value ratios (SUVR) in the temporal (cutoff = 1.325) or whole cortical gray (cutoff = 1.245) ROIs, high tau subgroups demonstrated significantly more decline on the MMSE, CDR, and ADAS-Cog13. Conclusions Our results suggest that [18F]GTP1 tau PET represents a prognostic biomarker in AD and are consistent with data from other tau PET tracers. Tau PET imaging may have utility for identifying AD patients at risk for more rapid cognitive decline and for stratification and/or enrichment of participant selection in AD clinical trials. Trial registration ClinicalTrials.gov NCT02640092. Registered on December 28, 2015 Supplementary Information The online version contains supplementary material available at 10.1186/s13195-021-00937-x.
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Affiliation(s)
- Edmond Teng
- Early Clinical Development, Genentech, Inc., South San Francisco, CA, USA.
| | - Paul T Manser
- Clinical Biostatistics, Genentech, Inc., South San Francisco, CA, USA
| | | | | | - Karen Pickthorn
- Early Clinical Development, Genentech, Inc., South San Francisco, CA, USA
| | - Suzanne L Baker
- Clinical Imaging Group, Genentech, Inc., South San Francisco, CA, USA.,Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Michael Ward
- Early Clinical Development, Genentech, Inc., South San Francisco, CA, USA.,Current Address: Alector, Inc., South San Francisco, CA, USA
| | - Geoffrey A Kerchner
- Early Clinical Development, Genentech, Inc., South San Francisco, CA, USA.,Current Address: F. Hoffmann-La Roche AG, Basel, Switzerland
| | - Robby M Weimer
- Biomedical Imaging, Genentech, Inc., South San Francisco, CA, USA
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Mahdavi KD, Jordan SE, Barrows HR, Pravdic M, Habelhah B, Evans NE, Blades RB, Iovine JJ, Becerra SA, Steiner RA, Chang M, Kesari S, Bystritsky A, O'Connor E, Gross H, Pereles FS, Whitney M, Kuhn T. Treatment of Dementia With Bosutinib: An Open-Label Study of a Tyrosine Kinase Inhibitor. Neurol Clin Pract 2021; 11:e294-e302. [PMID: 34484904 PMCID: PMC8382351 DOI: 10.1212/cpj.0000000000000918] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 07/07/2020] [Indexed: 11/15/2022]
Abstract
OBJECTIVE The pursuit of an effective therapeutic intervention for dementia has inspired interest in the class of medications known as tyrosine kinase inhibitors such as bosutinib. METHODS Thirty-one patients with probable Alzheimer dementia or Parkinson spectrum disorder with dementia completed 12 months of bosutinib therapy and an additional 12 months of follow-up. The Clinical Dementia Rating scale (as estimated by the Quick Dementia Rating System [QDRS]) was the primary cognitive status outcome measure. Secondary outcome measures included the Repeatable Battery Assessment of Neuropsychological Status (RBANS) and the Montreal Cognitive Assessment. Cox regression methods were used to compare results with population-based estimates of cognitive decline. RESULTS The present article reports on cognitive outcomes obtained at 12 months for 31 participants and up to 24 months for a 16-participant subset. Safety and tolerability of bosutinib were confirmed among the study population (Mage = 73.7 years, SDage = 14 years). Bosutinib was associated with less worsening in Clinical Dementia Rating (CDR) scores (hazard ratio = -0.62, p < 0.001, 95% confidence interval [CI]: -1.02 to -0.30) and less decline in RBANS performance (hazard ratio = -3.42, p < 0.001, 95% CI: -3.59 to -3.72) during the year of treatment than population-based estimates of decline. In the 24-month follow-up, wherein 16 patients were observed after 1 year postintervention, 31.2% of participants exhibited worsened CDR levels compared with their 12-month performances. CONCLUSIONS Results support an overall positive outcome after 1 year of bosutinib. Future studies should explore the relationship between tyrosine kinases and neurodegenerative pathology as well as related avenues of treatment.
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Affiliation(s)
- Kennedy D Mahdavi
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Sheldon E Jordan
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Hannah R Barrows
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Maša Pravdic
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Barshen Habelhah
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Natalie E Evans
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Robin B Blades
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Jessica J Iovine
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Sergio A Becerra
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Rachel A Steiner
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Marisa Chang
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Santosh Kesari
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Alexander Bystritsky
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Ed O'Connor
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Hyman Gross
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - F Scott Pereles
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Mike Whitney
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
| | - Taylor Kuhn
- Neurological Associates - The Interventional Group (KDM, MP, BH, NEE, RBB, JJI, RAS, MC), Santa Monica, CA; Department of Neurology (SEJ), University of California, Los Angeles; Neurological Associates of West Los Angeles (HRB, EOC), Santa Monica, CA; Synaptec Network (SAB), Santa Monica, CA; Pacific Neuroscience Institute (SK), Santa Monica, CA; Department of Psychiatry and Biobehavioral Sciences (AB, TK) University of California, Los Angeles; Department of Neurology (HG), University of Southern California, Los Angeles; and Rad Alliance, Inc. (FSP, MW), Los Angeles, CA
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