Amyloid Detected in the Lens of the Eye Strongly Correlates to Amyloid Levels Detected in the Brain
At AAIC 2014, Paul D. Hartung, M.S, President and CEO of Cognoptix, Inc. and colleagues reported the results of a study of a novel fluorescent ligand eye scanning (FLES) system that detects beta-amyloid in the lens of the eye using a topically-applied ointment that binds to amyloid and a laser scanner.
The researchers studied 20 people with probable Alzheimer's disease, including mild cases, and 20 age-matched healthy volunteers; all participants' Alzheimer's status was masked from the observers. The ointment was applied to the inside of participants' lower eyelids the day before measurement. Laser scanning detected beta-amyloid in the eye by the presence of a specific fluorescent signature. Brain amyloid positron emission tomography (PET) scanning was performed on all participants to estimate amyloid plaque density in the brain.
Using results from the fluorescent imaging, researchers were able to differentiate people with Alzheimer's from healthy controls with high sensitivity (85 percent) and specificity (95 percent). In addition, amyloid levels based on the eye lens test correlated significantly with results obtained through PET brain imaging. No serious adverse events were reported, according to the scientists.
"There is a critical need for a fast, dependable, low-cost and readily available test for the early diagnosis and management of Alzheimer's disease," said Pierre N. Tariot, M.D., Director of the Banner Alzheimer's Institute in Phoenix, and a principal investigator in the study.
"The results of this small Phase 2 feasibility study validate our previously reported results and demonstrate the ability of the FLES system to reproduce the findings of clinical diagnosis of Alzheimer's with high sensitivity and specificity," said Hartung. "This system shows p
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