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2014 ; 6
(2
): 19
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Modulation of ?-amyloid by a single dose of GSK933776 in patients with mild
Alzheimer s disease: a phase I study
#MMPMID24716469
Leyhe T
; Andreasen N
; Simeoni M
; Reich A
; von Arnim CA
; Tong X
; Yeo A
; Khan S
; Loercher A
; Chalker M
; Hottenstein C
; Zetterberg H
; Hilpert J
; Mistry P
Alzheimers Res Ther
2014[]; 6
(2
): 19
PMID24716469
show ga
INTRODUCTION: In this study, we evaluated the safety and pharmacodynamic effects
of the Fc-inactivated anti-?-amyloid (anti-A?) monoclonal antibody GSK933776 in
patients with mild Alzheimer's disease and mild cognitive impairment. A? and tau
levels were investigated in cerebrospinal fluid (CSF), and the relationship
between A? levels and A? modulation in plasma was explored. The feasibility of a
continuous sampling method using a lumbar catheter was assessed. METHODS: This
trial was a phase I, open-label, uncontrolled, single-dose, exploratory
experimental medicine study of intravenous GSK933776 at doses of 1 mg/kg, 3 mg/kg
or 6 mg/kg (n?=?6/group). The time course of plasma and CSF concentrations of
GSK933776 and A? was assessed. Sample size was based on feasibility, and no
formal statistical analyses were performed. RESULTS: Following administration of
GSK933776 at doses of 1 mg/kg, 3 mg/kg and 6 mg/kg, there were decreases from
baseline in CSF A?1-42 (from 0 to 12 hours) by 22.8 pg/ml (6.2%), 43.5 pg/ml
(9.2%) and 60.5 pg/ml (12.5%), respectively. Plasma concentrations of total
A?18-35 and A?4228-42 increased immediately after infusion and CSF tau
concentration increased slightly, but did not significantly change, following
administration of all doses of GSK933776. Pharmacokinetics confirmed the presence
of GSK933776 in the CSF, which exhibited a dose-response relationship. One
patient underwent minor surgery without sequelae following a ruptured lumbar
catheter. CONCLUSION: GSK933776 demonstrated pharmacological activity and target
engagement in CSF and plasma, and the continuous sampling method via a catheter
successfully assessed the A? changes following single-dose administration of
GSK933776. TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT01424436.
Registered 4 August 2011.