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Four Alzheimer's Clinical Trials Address a Variety of Treatment Targets - Amyloid, Tau, Synapse Formation
Date:7/29/2008

first time by Robert C. Green, MD, MPH, of Boston University School of Medicine. Tarenflurbil is classified as a selective amyloid lowering agent, which was shown in nonclinical studies to modulate gamma secretase activity. The drug was in trials in people with mild Alzheimer's to determine if its ability to lower the amount of toxic beta-amyloid would slow or stop the course of the disease.

In the randomized, double-blind, placebo-controlled trial, 1,649 individuals with mild Alzheimer's (mean MMSE in both groups = 23.3) were randomized 1:1 to receive tarenflurbil 800 mg twice-a-day or placebo for 18 months. The co-primary outcome measures of efficacy were two standard measures of cognition and the ability to accomplish activities of daily living, respectively the ADAS-cog and the ADCS-ADL, with assessments conducted every three months. The secondary outcome measure was the Clinical Dementia Rating scale. Exploratory outcomes included the Neuropsychiatric Inventory (NPI), Quality of Life-Alzheimer's test, and Caregiver Burden Inventory.

The researchers found that the drug did not achieve statistical significance in either of its primary endpoints of cognition and activities of daily living. Also, it did not achieve statistical significance on the secondary endpoint. By the end of the 18-month trial, patients in both the tarenflurbil and placebo groups had declined approximately seven points on the ADAS-cog scale and 10 points on the ADCS-ADL scale.

According to the researchers, the reported adverse effects reflect the expected profile of the elderly population with Alzheimer's and, in most participants, symptoms were well balanced between the tarenflurbil and placebo groups. However, in the tarenflurbil treatment group, there was increased frequency of anemia (9.7 percent vs. 4.5 percent), infections (pneumonia, H. zoster, sepsis) (6.9 percent vs. 2.9 percent), and gastrointestinal ulcers (1.7 percent vs. 0.4 percent).

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SOURCE Alzheimer's Association
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