‘The Memory Thief’ Still Eludes Grasp Of Pharma R&D

Over several decades, in fact, since its very inception, pharma R&D has been playing a crucial role in alleviating diseases of various types – from severe acute infections, to a large variety of non-infectious chronic illnesses, including many dreaded diseases, such as, cancer.

In the battle against diseases, pharma research and development initiatives, both by a large number of academia and also the pharma players, have mostly won, decisively. R&D has been consistently coming out with flying colors, both in finding cures and also in effective disease management, to prolong and improve the quality of life of billions of people, the world over.

However, there is still an important disease area, where pharma R&D has not been successful yet. Without any prior warning, this disease stealthily affects the human brain and completely erases the entire lifetime memory of the person, gradually but surely, over a relatively short period of time. This disease is known as Alzheimer’s, following the name of Dr.  Dr. Alois Alzheimer, who first detected it in 1906. Due to its devastating impact on human memory, some, very appropriately, term the Alzheimer’s disease – ‘The memory thief’.

I discussed this subject in one of my previous articles titled, “It Took 90 Years To Accept The Dreaded Disease Discovered In A Mental Asylum”, published in this Blog on December 01, 2014.

A recent alarm for a future epidemic:

A January 6, 2016 paper titled, “Sounding the alarm on a future epidemic: Alzheimer’s disease”, published by the well reputed public research university in the United States, ‘The University of California, Los Angeles (UCLA), made the following noteworthy observation:

“If the aging trend illustrates the success of public health strategies, it also raises the specter of a major public health crisis – a sharp rise in the number of people living with Alzheimer’s disease.”

Causing havoc in many lives and families:

‘Alzheimer’s Disease Education and Referral (ADEAR) Center’ of the United States, currently ranked Alzheimer’s disease as the sixth leading cause of death in the United States, but recent estimates indicate that the disorder may rank third, just behind heart disease and cancer, as a cause of death for older people.

According to Mayo Clinic, the frightful disease – Alzheimer’s, is progressive in nature. At the onset, the afflicted persons may exhibit just mild confusion and some difficulty in remembering.

Tragically, in around five years or a little after, Alzheimer’s would erase the entire lifetime memory of most of the affected persons, when they may even forget the important people in their lives and undergo dramatic personality changes.

The dreaded disease – Alzheimer’s, still without any effective medication in place, has been causing havocs in many lives and families since long, involving many great international personalities too. It is one of those ailments, where the disease process mostly commences almost a decade before the visible appearance of above clinical symptoms.

Worldwide Projections of Alzheimer’s Disease Prevalence:  

The above UCLA report highlights the worldwide projections of Alzheimer’s disease prevalence from 2005 to 2050, which includes both the early and late stage patients.

According to this report, the number of people afflicted by this total memory-erasing disease, would grow from 35.26 million in 2015 to as high as 106.23 million populations in 2050, as follows:

Year Alzheimer’s disease prevalence (in Millions)
2005 25.73
2010 30.12
2015 35.26
2020 41.27
2025 56.55
2040 77.49
2050 106.23
Similar situation in India: 

The situation in India seems to be no different, though we are living today in the midst of the hype of ‘Demographic Dividend’.

According to the March 2012 report of ‘The Population Reference Bureau’ of Washington DC of the United States, India’s population with ages 60 and older, who are more prone to Alzheimer’s disease, is projected to increase dramatically over the next four decades, from 8 percent in 2010 to 19 percent in 2050. By mid-century, this age group is expected to encompass 323 million people, a number greater than the total US population in 2012.

Currently available treatment:

At present, there are no treatments available that can stop or slow down the progression of Alzheimer’s disease in the brain of the affected persons.

As I wrote earlier, very often the onset of this disease starts decades before the visible manifestation of even preliminary symptoms. Thus, there is a critical need for early medical interventions to arrest the disease progression.

Again, quoting Mayo Clinic, current Alzheimer’s disease medications and management strategies may at best temporarily improve symptoms. These symptomatic treatments can sometimes, help Alzheimer’s patients maximize cognitive and other related functions to the extent possible, and thereby maintain independence for a little while longer.

Primary reasons:

Many earlier research had postulated that plaques and tangles are primarily responsible for the permanent damage and destruction of nerve cells.

While the plaques are abnormal clusters of beta-amyloid protein fragments between nerve cells, tangles are twisted fibers made primarily of a protein called “tau” that accumulates in the brain cells, damaging and killing them.

The appearance of these two in the brain structure makes the affected persons suffer from almost irreversible memory loss, altered thinking pattern and associated behavioral changes, which are usually serious in nature.

However, I shall discuss below about a very recent research that is focusing on a different and novel target.

Key hurdles in Alzheimer’s drug development:

Despite all these, almost at a regular interval, we have been getting to know about various new studies on Alzheimer’s disease, mostly from academic and scientific institutions. It clearly vindicates, at least, the global academia and also some pharma players, are working hard to get an effective key to unlock the pathway of Alzheimer’s disease process.

The hurdles in developing a suitable drug for effective treatment of Alzheimer’s disease are many. A paper titled, “Researching Alzheimer’s Medicines: Setbacks and Stepping Stones Summer 2015”, published by the Pharmaceutical Research and Manufacturers of America (PhRMA) – a trade association of leading biopharmaceutical researchers and biotechnology companies of the United States, cited the following three major reasons as examples:

  • Scientists still do not understand the underlying causes and mechanisms of the disease. It remains unknown whether many of the defining molecular characteristics of the disease are causes, effects, or signs of progression. This scientific knowledge gap makes the identification and selection of viable targets for new medicines difficult. 
  • Current preclinical models of Alzheimer’s disease are limited in the extent to which they can be extrapolated or translated to the human condition. Better models are needed to facilitate preclinical testing of drug candidates and better predict the effects of the drug in humans. 
  • The absence of validated, non-invasive biomarkers to identify disease presence and progression means the diagnosis is delayed until an individual becomes symptomatic. This makes it particularly challenging to evaluate, enroll, retain, and follow up with patients in clinical studies. It also makes it challenging to assess the effects of the drug candidate. Ultimately, this leads to long and very expensive clinical trials. 

The PhRMA publication also states that “researchers believe that no single medicine will be able to defeat Alzheimer’s; rather, several medicines will probably be needed to combat the disease. Thus, researchers need not one, but an array of options to prevent or treat Alzheimer’s disease.”

High rate of R&D failure, with flickers of success:

The above PhRMA publication also indicates, between 1998 and 2014, 123 medicines in clinical development have been halted and have not received regulatory approval.

In this rather gloomy R&D scenario, there are also some flickers of success in this pursuit.

In a recent study, the scientists at the University of Southampton announced that their findings added weight to evidence that inflammation in the brain is what drives the disease. A drug, used to block the production of these microglia cells in the brains of mice, had a positive effect. The study, therefore, concluded that blocking the production of new immune cells in the brain could reduce memory problems seen in Alzheimer’s disease. This finding is expected to pave the way for a new line of treatment for Alzheimer’s disease.

Currently, most drugs used for the treatment of dementia targeted amyloid plaques in the brain, which are considered as a key characteristic of people with the Alzheimer’s disease. According to an article published in Forbes on March 20, 2015, several amyloid-clearing drugs have failed to show statistically significant benefits in large clinical trials. Notable among those are Bapineuzumab – developed by Elan Pharmaceuticals, Pfizer and Johnson & Johnson failed in 2009; Solanezumab of Eli Lilly failed in 2012; and so did Gantenerumab of Roche in 2014.

The latest study, as quoted above, published in the journal ‘Brain’, on January 8, 2016 suggests that targeting inflammation in the brain, caused by a build-up of immune cells called microglia, could halt progression of the disease.

Another flicker of hope is, another drug being developed by Biogen Idec for the treatment of Alzheimer’s disease appeared to slow down the inexorable cognitive decline of patients’, though in a small and a preliminary study.

Lack of research funding is a critical impediment:

Be that as it may, many experts believe that not enough is still being done in Alzheimer’s research, especially in the area of funding.

In an article titled, “Alzheimer’s disease: are we close to finding a cure?” published by ‘Medical News Today (MNT)’ on August 20, 2014, quoted the Alzheimer’s Society, as follows:

“Dementia is the biggest health and social care challenge of our generation, but research into the condition has been hugely underfunded. This lack of funding has hampered progress and also restricted the number of scientists and clinicians working in the dementia field.”

As an illustration, MNT mentioned that in the United States Alzheimer’s research received US$504 million in funding from the National Institutes of Health (NIH) in 2014, while cancer received more than US$5 billion. Breast cancer alone received more funding than Alzheimer’s at US$674 million. 

Quoting an expert in this field the report highlighted, “Other diseases have demonstrated that sustained investment in research can improve lives, reduce death rates and ultimately produce effective treatments and preventions. We have the tools and the talent to achieve breakthroughs in Alzheimer’s disease, but we need the resources to make this a reality.”

Conclusion:

From the published research reports, it appears that the quest to decipher the complicated Alzheimer’s disease process continues, at least by the academic and scientific institutions, with equal zest. 

These scientists remain committed to finding out the ‘magic bullet’, which would be able to effectively address the crippling disease. As a result, the research has also moved from discovery of effective amyloid-clearing drugs to search for new molecules that targets inflammation in the brain, caused by a build-up of immune cells called microglia. 

Undeniably, the challenges ahead are still too many.

Nevertheless, enough confidence is also building up to halt the epidemic of Alzheimer’s by overcoming those hurdles, the world over. Experts are hoping that both a cure and also successful preventive measures for the disease, are not too far anymore.

Though some Global Pharma majors invested significantly to discover effective drugs for Alzheimer’s disease, overall research funding in this area is still far from adequate, according to the Alzheimer’s Society. 

For various reasons, not many pharma players today seem to believe that it would be financially prudent for them to make significant investments in developing new molecules for the treatment of Alzheimer’s – the disease that robs memory of millions of people, completely, and without any prior warning whatsoever.

‘The Memory Thief’ continues to prowl, undeterred, still eluding otherwise brilliant Pharma R&D, across the world.

By: Tapan J. Ray

Disclaimer: The views/opinions expressed in this article are entirely my own, written in my individual and personal capacity. I do not represent any other person or organization for this opinion.

 

Alzheimer’s Disease: Robs Memory: Steals Dignity: Escapes Treatment

At a well reputed Mumbai Club, quite unexpectedIy, I bumped into Sumeet (name changed). It has indeed been a long while since we met at his home in South Mumbai. He came there with his wife Shilpa (name changed). Sumeet, was literally an icon of yesteryears in every respect, a bright engineer with MBA and a much-accomplished leader of his time who retired at the turn of the new millennium.

“How are you Sumeet da?”, I started off cheerfully, as he was looking all around.

“Very well, very well and you?”, he replied softly with a faint quivering of his lips, but without any eye contact.

“I am good Sumeet da, but have you recognized me?” I queried with apprehension.

Turning his face towards Shilpa, Sumeet hesitatingly replied, “No. But have we met before?”

The innocent question struck me as lightning from nowhere, making me a bundle of emotion momentarily. With a lump in my throat and clenching my fists, I struggled hard to regain my composure.

Sumeet, one of the the brightest of brights, from earlier years of our generation, is now a victim of a dreaded illness called Alzheimer’s Disease (AD). The disease has robbed him of his priceless memory, changed his behavior beyond recognition, kidnapped him from his own self, and has stolen most of his much-valued dignity in life, mercilessly.

Alzheimer’s Disease (AD) in brief:

Alzheimer’s Disease (AD), as known to many, is the most common form of dementia, accounting for 60 to 80 percent of all cases, that results in serious memory loss and other intellectual and behavioral traits of individuals, serious enough to interfere with a person’s daily life and tasks.

AD has been defined as, a neurodegenerative type of dementia, in which the death of brain cells causes memory loss and cognitive decline. The total brain size shrinks with AD, as the tissue has progressively fewer nerve cells and connections. Brains affected by AD would always show tiny inclusions in the nerve tissue, called plaques and tangles.

Plaques are found between the dying cells in the brain – from the build-up of a protein called beta-amyloid, while the tangles are within the brain neurons and from a disintegration of another protein, called tau.

Though the abnormal protein clumps and inclusions in the brain tissues are always present in AD, there could be another underlying process also that is actually causing the disease, which scientists are not sure of, as yet.

Be that as it may, with the progression of the disease, besides memory loss, AD precipitates other serious symptoms, such as, deepening confusion about events, time and place; mood and behavior changes; unfounded suspicions about family, friends and even professional caregivers; disorientation; other behavior changes; then difficulty speaking, swallowing and walking. At a late stage, the patients lose the ability to carry on even a conversation and respond to their environment.

Cause:

Although the causes of AD are not quite clear to the scientists, as yet, the disease results from a combination of genetic, lifestyle and environmental factors that adversely affect the brain over a period of time.

Scientists opine that in less than 5 percent of the cases, the causative factors of the AD are specific genetic changes that can almost definitively indicate that a person would develop AD. According to published reports, while the strongest risk gene found so far is apolipoprotein e4 (APOE e4), other risk genes have not been conclusively confirmed, just yet.

Survival rate:

According to published reports, the survival rate of AD patients, after their symptoms become noticeable to others, can range from 4 to 20 years, depending on health conditions, the average being 8 years. In the United States, AD is the sixth leading cause of death.

Not a normal part of the aging process:

Although majority of people with AD are over 60 years of age, it is not just a disease of old age. Up to 5 percent of cases the disease may strike even younger people in 40s or 50s. Women are found to be more prone to AD than men.

Prevalence:

The World Health Organization (WHO) declared dementia, in general, as a priority condition in 2008, through the Mental Health Gap Action Program.

Each year, the total number of new cases of dementia worldwide has been reported as nearly 7.7 million, which means one new case every four seconds.

According to AC Immune SA of Switzerland, AD will be one of the biggest burdens of the future society showing dramatic incidence rates. Over 44 million people were now affected with AD worldwide. Since the incidence and prevalence of AD increase with age, the number of patients will grow dramatically as our society gets older. By 2050 the patient numbers are expected to triple, touching 135 million AD patients worldwide.

India:

According to another report titled, “Priority Medicines for Europe and the World – A Public Health Approach to Innovation” By Béatrice Duthey, Ph.D published on 20 February 2013, the fastest growth of AD in the elderly population is now taking place in China, India, and their south Asian and western Pacific neighbors and has become a major public health concern as the population ages.

AD is the most common kind neurodegenerative disease in India. There are reportedly around 5 million dementia patients in the country of which, roughly 70 to 80 per cent have AD. This number is expected to double by 2030, and the costs involved are expected to increase three times. Besides drugs, costs of ‘care giving’ for AD patients are also expected to rise significantly.

The market and economic impact:

According to AC Immune SA, AD market is currently estimated at US$ 5 billion annually and is expected to exceed US$ 20 billion by 2020.

The global economic impact of AD is shown by its worldwide cost of US$ 640 billion, exceeding 1 percent of gross world product. It can be seen as the most significant health crisis in the 21st century. The 2010 annual costs of treating and caring for patients was  $183 billion in the US alone. This figure is expected to increase to $ 1.1 trillion in 2015.

AD is becoming the third most expensive disease, counting for 30 percent of the US healthcare costs. The medical costs for Alzheimer´s Disease patients are three times higher than for other older patients. Moreover, AD patients mostly live at home resulting in high impact on family’s health, emotional well being, as well as their employment and financial security.

India:

Many elderly people in India live with AD without any treatment, accepting the condition as an unavoidable one and related to the aging process of an individual.

The present day costs of maintaining a patient with AD in India, who has been diagnosed, are reportedly any where between Rs. 50,000 to Rs. 4,50,000. Additionally, many elderly couples are just not frail and living alone these days, as their children may be working in a far off country.

Currently, AD market in India is reportedly around US$ 50 million, growing around 25 percent. More disease awareness initiatives are expected to accelerate the market growth by manifold. Sun Pharma is the market leader in the AD segment. Other, key players are Dr. Reddy’s Laboratories (DRL), Torrent, Glenmark, Ranbaxy, Cipla and Alkem

In fact, Cipla recently reportedly announced an investment of US$ 21 million in Chase Pharmaceuticals of the United States, which is an early-stage drug development company focused on developing novel approaches to improve treatments for Alzheimer’s disease.

In addition, DRL is also making rapid strides in this area. In 2013, the company launched generic Donepezil Hydrochloride tablets for AD in the US market.

Treatment:

There is no cure for AD as of date. There is no disease-modifying treatment for AD even in the global market, either.

Since 2003, there has not been any single innovative drug launched in the global market either for prevention or cure of AD. The available drugs cannot stop the progression of the disease. They just temporarily slow the worsening of dementia symptoms. The situation gets even more complicated as the disease is usually diagnosed late, when already 70 percent of the nerve cells in the brain are dead.

Global researchers are looking for new treatments to alter the course of the disease and improve the quality of life for people suffering from this dreaded disease.

For the treatment of AD, the U.S. Food and Drug Administration (FDA) has approved two types of medications, namely,

-      Cholinesterase inhibitors, such as, Aricept, Exelon, Razadyne, Cognex

-      Memantine, such as, Namenda to treat the cognitive symptoms (memory loss, confusion, and problems with thinking and reasoning) of the disease.

Many doctors prescribe both types of medications together, along with Vitamin E for cognitive changes.

However, Aricept is the only cholinesterase inhibitor approved to treat all stages of AD, from moderate to severe.

Although, Tacrine (Cognex) was the first cholinesterase inhibitor approved, very few doctors prescribe this drug today because of more serious side effects.

According to The Alzheimer’s Association, the world’s leading voluntary health organization in Alzheimer’s care, support and research; the current treatments for AD at a glance are as follows:

Treatments at a glance:

Generic Brand Approved For Side Effects
donepezil Aricept (Eisai/Pfizer) All stages Nausea, vomiting, loss of appetite and increased frequency of bowel movements.
galantamine Razadyne (Janssen) Mild to moderate Nausea, vomiting, loss of appetite and increased frequency of bowel movements.
memantine Namenda/Ebixa (Actavis/Lundbeck) Moderate to severe Headache, constipation, confusion and dizziness.
rivastigmine Exelon (Novartis) Mild to moderate Nausea, vomiting, loss of appetite and increased frequency of bowel movements.
tacrine Cognex (Pfizer) Mild to moderate Possible liver damage, nausea, and vomiting.
vitamin E Not applicable Not approved Can interact with antioxidants and medications prescribed to lower cholesterol or prevent blood clots; may slightly increase risk of death.

India:

In India the treatment is much the same. Besides, patented versions, relatively cheaper generic equivalents of all these drugs are available in the country.

On going drug trials: 

As there are no effective therapies for AD, this therapy segment remains at the top of the list for unmet needs, globally. Disease-modifying therapies could transform this market appreciably.

At the Alzheimer’s Association International Conference held in Copenhagen, Denmark from July 12 to 17, 2014, scientists described five trials that may prevent the onset of the neurodegenerative disease in people not yet experiencing cognitive decline, as follows:

  • Gantenerumab and Solanezumab: Two experimental drugs, , both of which are antibodies designed to bind to amyloid and prevent it from forming brain-damaging plaques.
  • Solanezumab: An experimental anti-amyloid compound.
  • The trial will first pilot a screening test for two genes to see if it can accurately predict risk of mild cognitive impairment. The next phase of the trial will test an experimental compound designed to delay symptoms of mild cognitive impairment and Alzheimer’s disease in people without symptoms.
  •  Crenezumab: Anti-amyloid antibody
  •  An immunotherapy that prompts the body’s immune system to produce antibodies against amyloid protein, and a beta-secretase inhibitor that blocks the production of certain forms of amyloid.

According to Alzheimer’s Disease Therapeutics and Diagnostics: World Market 2013-2023 the following global players hold greatest potential. In particular, the analysis investigates these companies:

• Pfizer
• Eisai
• Actavis
• Lundbeck
• Novartis
• TauRx Therapeutics
• AC Immune.

A large pharma industry association of the United States has indicated in a report that dedicated researchers are currently working on nearly 100 medicines in development for Alzheimer’s and other dementias. These could give future patients a new hope for a future free of AD.

Conclusion:

AD can strike anyone at any time without any visible warning whatsoever. It then robs the person’s memory, steals the individual’s dignity of life, evades all available current treatments, till it is able to extinguish slowly and agonizingly the last flicker of life, mostly much sooner than otherwise it would have been.

Like many other countries, India – the world’s 2nd largest population, is also facing a crisis in dealing with the growing number of AD patients.

These patients require constant support from family/professional caregivers along with medical attention. The progression of the disease leaves patients mostly in semi-vegetative states, at times for years.

If no cure is available for AD, arresting the disease progression becomes a major health challenge in the country. Currently only short term symptomatic treatment is available. Neither is there any organized mechanism for early diagnosis of AD with specific markers, which could lead to early intervention with the most appropriate and effective drugs to address the disease sooner.

Alzheimer’s Disease that turns millions of otherwise boisterous individuals, like Sumeet, into living dead, snatching away everything that a life would possibly demand at its minimum, must feature in the areas of focus of the new national heath policy of India under the new dispensation.

By: Tapan J. Ray

Disclaimer: The views/opinions expressed in this article are entirely my own, written in my individual and personal capacity. I do not represent any other person or organization for this opinion.