Currently, Alzheimer's disease can only be definitively confirmed through the detection of amyloid plaques and/or tangles in the brain during autopsy after death or with a brain tissue biopsy. The new method uses the drug florbetaben as a tracer during a PET scan of the brain to visualize amyloid plaques during life.
In order to prove that the florbetaben PET scan detects beta-amyloid in the brain, the global phase III study directly compared brain regions in the PET scan to respective brain regions after death during autopsy.
For the study, more than 200 participants nearing death (including both participants with suspected Alzheimer's disease and those without known dementia) and who were willing to donate their brain underwent MRI and florbetaben PET scan. The amount of plaque found in the 31 participants who reached autopsy was then compared to the results of the scans. A total of 186 brain regions from these donors were analyzed along with 60 brain regions from healthy volunteers. Based on these 246 brain regions the study found florbetaben to detect beta-amyloid with a sensitivity of 77 percent and a specificity of 94 percent.
Comparison of the visual assessment method proposed for florbetaben for clinical practice with the post mortem diagnosis revealed a sensitivity of 100 percent and a specificity of 92 percent. Sensitivity is the percentage of actual positives that are correctly identified as positive, and specificity is the percentage of negatives that are correctly identified.
"These results confirm that florbetaben is able to detect beta-amyloid plaques in the brain during life with great accuracy and is a suitable biomarker," said study author Marwan Sabbagh, MD, director of Banner Sun Health Research Institute in Sun City, Ariz., and a Fellow of the American Academy of Neurology. "This is an easy, non-invasive way to assist an Alzheimer's diagnosis at an early stage. Also exciting is the possibility of using florbetaben as tool in future therapeutic clinical research studies where therapy goals focus on reducing levels of beta-amyloid in the brain."
The study was supported by Bayer Healthcare Berlin.
Learn more about Alzheimer's disease at http://www.aan.com/patients.
The American Academy of Neurology, an association of more than 25,000 neurologists and neuroscience professionals, is dedicated to promoting the highest quality patient-centered neurologic care. A neurologist is a doctor with specialized training in diagnosing, treating and managing disorders of the brain and nervous system such as stroke, Alzheimer's disease, epilepsy, Parkinson's disease and multiple sclerosis. For more information about the American Academy of Neurology, visit http://www.aan.com or find us on Facebook, Twitter, Google+ and YouTube.Media Contacts:
Rachel Seroka | EurekAlert!
New discoveries predict ability to forecast dementia from single molecule
12.12.2018 | UT Southwestern Medical Center
Pain: Perception and motor impulses arise in the brain independently of one another
12.12.2018 | Technische Universität München
What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...
A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.
The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...
A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.
Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...
Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...
What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.
Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...
12.12.2018 | Event News
10.12.2018 | Event News
06.12.2018 | Event News
13.12.2018 | Life Sciences
13.12.2018 | Physics and Astronomy
13.12.2018 | Earth Sciences