plasma alzheimer .pdf

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THE PLASMA FOR ALZHEIMER SYMPTOM
AMELIORATION (PLASMA) STUDY.

Sharon J. Sha1, Gayle K. Deutsch1, Lu Tian2, Kara Richardson3, Maria Coburn3, Jennifer Guadioso1, Tatiana
Marcal4, Ethan Solomon5, Athanasia Boumis1, Anthony Bett3, Steven P. Braithwaite6, Sam Jackson6, Karoly
Nikolich6, Darby Stephens1, Geoffrey A. Kerchner1, Tony Wyss-Coray1,6 ((1) Department of Neurology and
Neurological Sciences, Stanford University, Stanford, CA, USA; (2) Department of Health Research and Policy,
Stanford University, Stanford, CA, USA; (3) Department of Neurosurgery, Stanford University, Stanford, CA,
USA; (4) Department of Pediatrics, Stanford University, Stanford, CA, USA Endocrinology; (5) Alzheimer’s
Therapeutic Research Institute, University of Southern California, Los Angeles, CA, USE;(6) Alkahest, San Carlos
CA, USA)

Background : Plasma obtained from young mice has been demonstrated in aged mice to restore
memory and to stimulate synaptic plasticity in the hippocampus. Whether these findings
translate to man is unknown as the effects of plasma on cognitive function have not yet been
studied in aged humans or in patients with Alzheimer’s disease (AD). The primary objective of
this study was to assess the safety, tolerability and feasibility of infusions of plasma from 1830-year-old donors in patients with mild to moderate AD. Secondary objectives were to
determine the effect of plasma infusions on cognition, functional ability, and mood. Evaluation
of potential effects on functional connectivity in the default mode network and the identification
of plasma components associated with aging and Alzheimer’s disease were exploratory
endpoints.
Methods : Patients with mild to moderate AD were recruited for a safety, tolerability and
feasibility study of infusions of young plasma in humans. Nine subjects were enrolled and
randomized to treatment under a double-blind crossover protocol with four once-weekly
infusions of either ~250mL of plasma from 18 to 30-year-old male donors or saline, followed
by a 6-week washout and then crossover to four once-weekly infusions of the alternate
treatment. An additional 9 subjects were enrolled and treated under an open label amendment
with four once-weekly infusions of ~250mL of plasma from male donors aged 18-30. As part
of this study, patients and/or informants were administered the ADAS-Cog 13-item version,
Trail Making Test Part A (TMTA) and Part B (TMTB), Geriatric Depression Scale (GDS),
Neuropsychiatric Inventory (NPI-Q), Clinical Dementia Rating Scale Sum of Boxes (CDRSB), the Functional Activities Questionnaire (FAQ) and the Alzheimer’s Disease Cooperative
Study Activities of Daily Living Inventory (ADCS-ADL) prior to infusions, after the fourth
infusion, and after the eighth infusion (when applicable). All analyses were carried out in the R
programing language and environment. Safety measures were compared between baseline and
4-week post-treatment timepoints using paired nonparametric rank tests. For each cognitive and
functional measure, we performed a linear mixed-effects regression analysis of both the
crossover and open-label patients. The linear mixed-effect regression model also takes into
account performance at baseline, repeated measures, and missing data.
Results : Results describing the primary endpoints of safety, tolerability and feasibility will be
presented and analyzed. Results describing the secondary and exploratory endpoints will be
presented and analyzed.
Conclusion : Conclusions will be presented.


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