The AMBAR study

AMBAR is an international and multicenter clinical trial designed by Grifols in collaboration with Fundació ACE in Barcelona, Spain; and the Alzheimer Disease Research Center in Pittsburgh, PA, U.S. Following a successful pilot, phase I and phase II, phase IIb/III of the trial aimed to evaluate the efficacy of plasma exchange to slow the progression of Alzheimer's.

Phase IIb/III of the trial has been carried out in 41 hospitals across the U.S. and Spain, with 496 patients with mild and moderate Alzheimer's taking part. The study was double-blind –neither patients nor evaluators knew who was receiving which treatment– and placebo-controlled.

AMBAR was designed to evaluate the efficacy of plasma exchange using different replacement volumes and concentrations of albumin.

The treatment lasted 14 months and was split into two phases: an initial phase common to all patients, followed by a second phase in which different volumes and concentrations of albumin were administered to different groups. In some cases, the albumin was alternated with intravenous immunoglobulin to correct a possible endogenous immunoglobulin decrease. The plasma exchange in placebo-controlled group was simulated in both phases.

The primary objectives were to evaluate the efficacy of the treatment by measuring variations in the patients' cognitive function and ability to carry out daily activities.

Clinical Study Design

The video explains the characteristics of the study and how the clinical trial has been carried out.

496 patients

with mild to moderate Alzheimer's

41 hospitals

22 US and 19 Spain

14 months

of treatment


It is currently estimated that 35 million people worldwide suffer from Alzheimer's, and this figure is continuing to grow.

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Grifols and Alzheimer's

Since 2004, we have led a broad range of research initiatives on Alzheimer's

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The AMBAR hypothesis

AMBAR is an innovative treatment proposal aimed at slowing the progression of Alzheimer's disease through periodic plasma exchange.

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The results

The new results of AMBAR, an innovative treatment approach for Alzheimer's disease (AD) using plasma science, show that both mild and moderate patients improve after treatment.