There is no cure or long-term treatment for Alzheimer’s disease, a neurodegenerative condition that destroys brain cells and inevitably leads to memory loss and death.
The few drugs available on the market today only treat symptoms, not the underlying, disabling cause of the disease.
But after years of research, Dr. Cherian Verghese, a certified physician investigator and medical director of Keystone Clinical Studies in Norristown, believes drugs that attack Alzheimer’s in its early stages are enticingly within reach.
“At Keystone we conduct studies on medicines that affect the brain; basically neurology and psychology,” Verghese said, sipping a mid-afternoon cup of coffee at Starbucks.
“For 20 or 30 years we have done research without any new understanding of what is going on, and now we’re looking at it from at least three or four different approaches.”
Alzheimer’s will surely be one of the “defining diseases” for the coming decade, “globally, nationally, and even locally,” Verghese said. “The prevalence is rising. Currently, 5.2 million Americans have Alzheimer’s, and it is expected to quadruple by the year 2040. About 5 percent of the population over 65 has it, and this percentage roughly doubles with every five years of age, such that by age 85, nearly 50 percent could develop Alzheimer’s.”
With its roughly 16 percent elderly population, Montgomery County is above the national average of around 11 percent, he noted.
“And even Pennsylvania has a higher percentage of elderly people than the rest of the country. There are a few reasons for that, with many of our families staying in the same neighborhood here; they don’t go far. There are very stable communities here and we have a lot of retirement communities. “All of this is impressionistic, however; not fact.”
His pride in the Keystone State partly inspired the name of his company, Verghese added.
“We wanted to fly the Pennsylvania flag in the national spotlight, but we also see ourselves as the connection between the pre-clinical world — the drug-development world — and the clinical world of patients.”
As they are supervised by the Food and Drug Administration, all approved drugs must undergo clinical trials for safety and effectiveness, Verghese explained.
“Every drug we have now, including Prozac, went through the same testing at one time,” he said.
While Keystone also conducts clinical trials on drugs to treat depression, bipolar disorder and other conditions, its focus is on developing drugs to treat the “ticking time bomb” that is Alzheimer’s.
“Many baby boomers will have Alzheimer’s. The Medicare cost alone of Alzheimer’s was $91 billion in 2005, and it is expected to go to $160 billion in 2010. This does not count the cost of other insurance plans, Medicaid and indirect costs. Experts fear that just this one illness can result in the bankruptcy of our health care system.
“Worldwide, it is felt to be among the most disabling and burdensome illnesses. In 2005 we spent $10 billion and that will go up to $116 billion by 2010 … a 65 percent jump.”
Because the disease is incurable, currently available drugs are simply used to modify it somewhat, Verghese said.
“They don’t change the course of the illness. For example, the statins we take for heart disease are disease modifers. Once statins come on board, the incidence and problems of heart disease have gone down dramatically.
We have no such thing with Alzheimer’s. The medications that are available for regular clinical treatment have a very modest effect. They have a small, short-lived effect of improving memory in some persons with AD. However, they have no effect on other aspects like personality change and problems with communication. The downward progression of the illness continues uninterrupted.”
But his research tells him there is a light shining at the end of the tunnel, Verghese noted.
“A lot of the historical factors are now coming together. The exact cause of Alzheimer’s is not known. But it has been known for over 100 years now that the main change in the brain is the accumulation of a sticky protein called amyloid. There are many other changes, like the presence of neurofibrillary tangles inside cells, inflammatory changes, and progressive cell death.
“There is no doubt that beta amyloid is the first part of the cascade of the things going wrong that will cause AD.”
Keystone Clinical Studies is conducting clinical trials on drugs that remove amyloids from the brain, Verghese said.
“Very high technology methods have been used to understand the structure and genesis of amyloid at a molecular level. Highly specific antibodies have been designed to break up the amyloid, and these compounds are in clinical trials currently.
“There has been some restrained excitement in scientific circles regarding a compound called Dimebon, after the publication of an article last year, in a major medical journal, The Lancet. In a one-year long study, Dimebon prevented deterioration and maybe even improved memory and other functions like behavior and global function. In the scientific world, the results of studies need to be confirmed again in other studies before they are accepted as a real fact and not an observation by chance in one study.”
Dimebon is going through large-scale Phase III clinical trials at Keystone, which if positive, could lead to approval from the FDA for regular clinical use of the medication, Verghese said.
Patients are welcome to participate in future trials for potential treatments of both Alzheimer’s and depression.
Verghese explained that the clinical trial process is divided into two parts: the pre-clinical phase of animal research, before the drug is given to people, and the clinical phase.
“The clinical portion is divided into four phases: safety, proof of concept — does it actually improve the condition? — and third is the big study that gets a drug approved. Phase IV is after the drug is approved, with post-marketing studies to find out how it is working. Keystone takes part in phase two, three and four studies.
“We are doing a lot of outreach efforts to get the word out,” Verghese added. “We’ve talked to doctors, visited senior centers … I would like to get the word out to people that there are options and treatments available.”
As Keystone’s primary investigator, Verghese becomes a patient’s primary physician, he said.
“It’s like the family doctor referring a patient to a cardiologist, who looks after the cardiology part but everything else falls under the family doctor. So I would look after the Alzheimer’s part, the depression part, depending on what kind of study is being done. We work very closely with family doctors because it’s important to know what medicines the patient is on.”
With the sound of the cappuccino machine going full throttle in the background, Verghese was asked what he thought of recent studies that suggest coffee drinking might prevent Alzheimer’s.
“There is no discussion in the scientific community to this extent,” he said. “None of the nutritional approaches have been shown to have an effect in rigorous clinical trials with sound methodology and good statistics. “There is any number of products that are marketed, some with ‘studies’ to back up. However, there are studies and then there are studies. There is a product that is marketed in Europe, which is made by taking pigs’ brains, dissolving them with enzymes, and then administering the resultant mixture intravenously to patients with Alzheimer’s.
“They say it works, and have a few studies to show that it does. Would I give it to any of my patients? No.”
To contact Keystone Clinical Trials, call 610-277-8073.