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SCVNews.com | FDA Facilitates Research on Earlier Stages of Alzheimer’s Disease | 11-17-2016
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To advance urgently needed research in Alzheimer’s disease, the Food and Drug Administration, or FDA, is engaging with researchers, drug companies, and the public as they design new clinical studies for promising drugs, especially in light of it being National Alzheimer’s Disease Awareness Month.

Alzheimer’s disease is a nightmare haunting many Americans.

More than 5 million Americans have been diagnosed with the disease, which is the sixth leading cause of death in the United States and the most common cause of dementia among people 60 or older. Alzheimer’s is an irreversible, progressive brain disease that slowly destroys memory and thinking skills. It eventually robs sufferers of the ability to perform even the simplest tasks of daily life.

Despite years of intensive efforts by scientists to develop new safe and effective treatments for Alzheimer’s, options remain limited. In the last 20 years, FDA has approved five drugs for the disease—the most recent one in 2003. Although the drugs can provide some benefit, more needs to be done.

A recent development could bring better results: three years ago, FDA scientists released a draft guidance that may help companies conduct clinical trials focused on what could be a more treatable stage of the disease, before the onset of noticeable dementia.

Research has shown that there is a lag of many years between the beginning of changes in a patient’s brain and the onset of Alzheimer’s symptoms. Yet in the past, clinical trials examined Alzheimer’s patients when their symptoms had become clearly apparent, long after the changes in their brains had started. Some researchers have theorized that the greatest benefits will be available if a treatment can be developed for very early in the disease course, when people have the very first symptoms of Alzheimer’s—or even earlier.

For that reason, the development of drugs for the treatment of Alzheimer’s disease has increasingly focused on the stages before the onset of overt dementia. A 2013 FDA draft guidance responded to this development by discussing the design of clinical trials for drugs for Alzheimer’s patients who are still in the very early stages of the disease, when only subtle symptoms are present.

“There may be a window of opportunity to affect the disease before people experience symptoms,” says Eric Bastings, M.D., a neurologist and the deputy director of FDA’s Division of Neurology Products.

FDA’s draft guidance may help researchers design clinical trials for early stage Alzheimer’s therapies. The agency hopes that the guidance will serve as a focus for continued discussions among FDA, sponsors of new drugs, the academic community, and the public.

“Earlier and more precise identification of patients with early changes in the brain who will go on to develop Alzheimer’s is important for the success of these clinical studies,” says Billy Dunn, M.D., a neurologist and the director of FDA’s Division of Neurology Products. “We hope that earlier interventions, before further extensive damage to the brain sets in, will be more successful. We’re very excited about the potential for this research to result in safe and effective treatments for early Alzheimer’s disease.”

FDA’s draft guidance aims to encourage research and discusses FDA’s thinking about conducting new clinical trials at the very early stages of Alzheimer’s disease—in patients with no obvious symptoms, or even no symptoms at all.

One example of how clinical trials are changing is the Anti-Amyloid Treatment in Asymptomatic Alzheimer’s study, a landmark public-private partnership funded in part by the National Institute on Aging. Participants are people ages 65 to 85 who have normal thinking and memory function but might be at risk for developing Alzheimer’s, based on an advanced brain scan. The three-year study is testing whether a new investigational treatment can slow the memory loss caused by Alzheimer’s.

One of the biggest challenges is correctly identifying patients at risk for developing Alzheimer’s. In recent years, researchers have identified biomarkers (measurements, often based on a laboratory test, of a condition or disease) that may indicate a higher risk for developing Alzheimer’s. Some of them are gene mutations.

“In a small proportion of patients, having someone in the family with Alzheimer’s dramatically raises the risk that they, too, will have the disease,” Dunn says.

For most people, however, the risk of Alzheimer’s is not quite as readily identified.

“If we can use biomarkers to better choose who should be in which clinical trials, these biomarkers hopefully will help increase the likelihood that we’ll be able to show the drug effect in clinical trials,” Bastings says.

Prompt detection of the disease may lead to the development of early treatments that could help patients retain their brain function for a long time, even if their underlying Alzheimer’s may not be reversed.

“We’re very excited about increasing our ability to find beneficial treatments for so many people with this devastating disease,” Dunn says.

This article appears on the FDA’s Consumer Updates page, which features the latest on all FDA-regulated products.

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