How Leqembi became the biggest news in Alzheimer’s disease in 40 years, and what comes next
A few months ago, Betsy Groves traveled less than a mile from her home in Cambridge, Mass. to give a talk to a bunch of scientists. The scientists, who worked for the pharmaceutical companies Biogen and Eisai, wanted to know how she lived her life, how she thought about her future, and what it was like when a doctor’s appointment in 2021 gave her the worst possible news. Groves, 73, has Alzheimer’s disease. She caught it early, through a lumbar puncture that showed evidence of amyloid, an Alzheimer’s hallmark, in her cerebrospinal fluid. As a way of dealing with her diagnosis, she joined the Alzheimer’s Association’s National Early-Stage Advisory Board, which helped her shift into seeing her diagnosis as something she could use to help others.
After her talk, Groves stayed for lunch with the scientists, who were eager to put a face to their work. Biogen and Eisai were about to release the first drug to successfully combat Alzheimer’s in 40 years of experimental disaster. Their drug, which is known by the scientific name lecanemab and the marketing name Leqembi, was granted accelerated approval by the U.S. Food and Drug Administration last Friday, Jan. 6, after a study in 1,800 people showed that it reduced cognitive decline by 27 percent over 18 months.
It is no exaggeration to say that this result is a huge deal. The field of Alzheimer’s drug development has been absolutely littered with failures. Almost everything researchers have tried has tanked in clinical trials. “Most of the things that we've done have proven not to be effective, and it's not because we haven’t been taking a ton of shots at goal,” says Anton Porsteinsson, director of the University of Rochester Alzheimer's Disease Care, Research, and Education Program, who worked on the lecanemab trial. “I think it's fair to say you don't survive in this field unless you're an eternal optimist.”
As far back as 1984, a cure looked like it was within reach: Scientists discovered that the sticky plaques that develop in the brains of those who have Alzheimer’s are made up of a protein fragment called beta-amyloid. Buildup of beta-amyloid seemed to be sufficient to disrupt communication between, and eventually kill, memory cells. If that was true, then the cure should be straightforward: Stop the buildup of beta-amyloid; stop the Alzheimer’s disease.
It wasn’t so simple. Over the next 38 years, hundreds of drugs designed either to interfere with the production of abnormal amyloid or to clear it from the brain flamed out in trials. It got so bad that neuroscience drug divisions at major pharmaceutical companies (AstraZeneca, Pfizer, Bristol-Myers, GSK, Amgen) closed one by one, leaving the field to smaller, scrappier companies, like Cambridge-based Biogen and Tokyo-based Eisai. Some scientists began to dismiss the amyloid hypothesis altogether: If this protein fragment was so important to the disease, why didn’t ridding the brain of it do anything for patients? There was another abnormal protein that showed up in the brains of Alzheimer’s patients, called tau. Some researchers defected to the tau camp, or came to believe the proteins caused damage in combination.
The situation came to a head in 2021, when the FDA granted provisional approval to a drug called aducanumab, marketed as Aduhelm, against the advice of its own advisory council. The approval was based on proof that Aduhelm reduced beta-amyloid in the brain, even though one research trial showed it had no effect on people’s symptoms or daily life. Aduhelm could also cause serious side effects, like brain swelling and amyloid related imaging abnormalities (known as ARIA, these are basically micro-bleeds that appear on MRI scans). Without a clear benefit to memory loss that would make these risks worth it, Medicare refused to pay for Aduhelm among the general population. Two congressional committees launched an investigation into the drug’s approval, citing corporate greed, lapses in protocol, and an unjustifiably high price. (Aduhelm was also produced by the pharmaceutical company Biogen.)
To be clear, Leqembi is not the cure Alzheimer’s researchers hope for. While the drug is the first to show clear signs of a clinical benefit, the scientific establishment is split on how much of a difference Leqembi will make in the real world.
So far, Leqembi is like Aduhelm in that it has been given accelerated approval only for its ability to remove amyloid from the brain. Both are monoclonal antibodies that direct the immune system to attack and clear dysfunctional beta-amyloid. The difference is that, while that’s all Aduhelm was ever shown to do, Leqembi’s makers have already asked the FDA to give it full approval – a decision that would increase the likelihood that Medicare will cover it – based on data that show it also improves Alzheimer’s sufferer’s lives. Leqembi targets a different type of amyloid, a soluble version called “protofibrils,” and that appears to change the effect. “It can give individuals and their families three, six months longer to be participating in daily life and living independently,” says Claire Sexton, PhD, senior director of scientific programs & outreach for the Alzheimer's Association. “These types of changes matter for individuals and for their families.”
To be clear, Leqembi is not the cure Alzheimer’s researchers hope for. It does not halt or reverse the disease, and people do not get better. While the drug is the first to show clear signs of a clinical benefit, the scientific establishment is split on how much of a difference Leqembi will make in the real world. It has “a rather small effect,” wrote NIH Alzheimer’s researcher Madhav Thambisetty, MD, PhD, in an email to Leaps.org. “It is unclear how meaningful this difference will be to patients, and it is unlikely that this level of difference will be obvious to a patient (or their caregivers).” Another issue is cost: Leqembi will become available to patients later this month, but Eisai is setting the price at $26,500 per year, meaning that very few patients will be able to afford it unless Medicare chooses to reimburse them for it.
The same side effects that plagued Aduhelm are common in Leqembi treatment as well. In many patients, amyloid doesn’t just accumulate around neurons, it also forms deposits in the walls of blood vessels. Blood vessels that are shot through with amyloid are more brittle. If you infuse a drug that targets amyloid, brittle blood vessels in the brain can develop leakage that results in swelling or bleeds. Most of these come with no symptoms, and are only seen during testing, which is why they are called “imaging abnormalities.” But in situations where patients have multiple diseases or are prescribed incompatible drugs, they can be serious enough to cause death. The three deaths reported from Leqembi treatment (so far) are enough to make Thambisetty wonder “how well the drug may be tolerated in real world clinical practice where patients are likely to be sicker and have multiple other medical conditions in contrast to carefully selected patients in clinical trials.”
Porsteinsson believes that earlier detection of Alzheimer’s disease will be the next great advance in treatment, a more important step forward than Leqembi’s approval.
Still, there are reasons to be excited. A successful Alzheimer’s drug can pave the way for combination studies, in which patients try a known effective drug alongside newer, more experimental ones; or preventative studies, which take place years before symptoms occur. It also represents enormous strides in researchers’ understanding of the disease. For example, drug dosages have increased massively—in some cases quadrupling—from the early days of Alzheimer’s research. And patient selection for studies has changed drastically as well. Doctors now know that you’ve got to catch the disease early, through PET-scans or CSF tests for amyloid, if you want any chance of changing its course.
Porsteinsson believes that earlier detection of Alzheimer’s disease will be the next great advance in treatment, a more important step forward than Leqembi’s approval. His lab already uses blood tests for different types of amyloid, for different types of tau, and for measures of neuroinflammation, neural damage, and synaptic health, but commercially available versions from companies like C2N, Quest, and Fuji Rebio are likely to hit the market in the next couple of years. “[They are] going to transform the diagnosis of Alzheimer's disease,” Porsteinsson says. “If someone is experiencing memory problems, their physicians will be able to order a blood test that will tell us if this is the result of changes in your brain due to Alzheimer's disease. It will ultimately make it much easier to identify people at a very early stage of the disease, where they are most likely to benefit from treatment.”
Learn more about new blood tests to detect Alzheimer's
Early detection can help patients for more philosophical reasons as well. Betsy Groves credits finding her Alzheimer’s early with giving her the space to understand and process the changes that were happening to her before they got so bad that she couldn’t. She has been able to update her legal documents and, through her role on the Advisory Group, help the Alzheimer’s Association with developing its programs and support services for people in the early stages of the disease. She still drives, and because she and her husband love to travel, they are hoping to get out of grey, rainy Cambridge and off to Texas or Arizona this spring.
Because her Alzheimer’s disease involves amyloid deposits (a “substantial portion” do not, says Claire Sexton, which is an additional complication for research), and has not yet reached an advanced stage, Groves may be a good candidate to try Leqembi. She says she’d welcome the opportunity to take it. If she can get access, Groves hopes the drug will give her more days to be fully functioning with her husband, daughters, and three grandchildren. Mostly, she avoids thinking about what the latter stages of Alzheimer’s might be like, but she knows the time will come when it will be her reality. “So whatever lecanemab can do to extend my more productive ways of engaging with relationships in the world,” she says. “I'll take that in a minute.”
Researchers Are Experimenting With Magic Mushrooms' Fascinating Ability to Improve Mental Health Disorders
Mental illness is a dark undercurrent in the lives of tens of millions of Americans. According to the World Health Organization, about 450 million people worldwide have a mental health disorder, which cut across all demographics, cultures, and socioeconomic classes.
One area of research seems to herald the first major breakthrough in decades — hallucinogen-assisted psychotherapy.
The U.S. National Institute on Mental Health estimates that severely debilitating mental health disorders cost the U.S. more than $300 billion per year, and that's not even counting the human toll of broken lives, devastated families, and a health care system stretched to the limit.
However, one area of research seems to herald the first major breakthrough in decades — hallucinogen-assisted psychotherapy. Drugs like psilocybin (obtained from "magic mushrooms"), LSD, and MDMA (known as the club drug, ecstasy) are being tested in combination with talk therapy for a variety of mental illnesses. These drugs, administered by a psychotherapist in a safe and controlled environment, are showing extraordinary results that other conventional treatments would take years to accomplish.
But the therapy will likely continue to face an uphill legal battle before it achieves FDA approval. It is up against not only current drug laws (all psychedelics remain illegal on the federal level) and strict FDA regulations, but a powerful status quo that has institutionalized fear of any drug used for recreational purposes.
How We Got Here
According to researchers Sean Belouin and Jack Henningfield, the use of psychedelic drugs has a long and winding history. It's believed that hallucinogenic substances have been used in healing ceremonies and religious rituals for thousands of years. Indigenous people in the U.S., Mexico, and Central and South America still use distillations from the peyote cactus and other hallucinogens in their religious ceremonies. And psilocybin mushrooms, also capable of causing hallucinations, grow throughout the world and are thought to have been used for millennia.
But psychedelic drugs didn't receive much research until 1943, when LSD's psychoactive effects were discovered by chemist Albert Hoffman. Hoffman tested the compound he had discovered years earlier on himself and found that the drug had profound mind-altering effects. He made the drug available to psychiatrists who were interested in testing it out as an adjunct to talk therapy. There were no truly effective drugs at the time for mental illnesses, and psychiatrists early on saw the possibility of psychedelics providing a kind of emotional catharsis that might represent therapeutic breakthroughs for many mental conditions.
During the 1950s and early 1960s, psychedelic drugs saw an increase in use within psychology, according to a 2018 article in Neuropharmacology. During this time, research on LSD and other hallucinogens was the subject of over 1,000 scientific papers, six international conferences, and several dozen books. LSD was widely prescribed to psychiatric patients, and by 1958, Hoffman had identified psilocybin as the hallucinogenic in "magic mushrooms," which was also administered. By 1965 some type of hallucinogenic had been given to more than 40,000 patients.
Then came a sea change. Psychedelic drugs caught the public's attention and there was widespread experimentation. The association with Hippie counterculture alarmed many and led to a legal and cultural backlash that stigmatized psychedelics for decades to come. In the mid-1960s, psychedelics were designated Schedule 1 drugs in the U.S., meaning they were seen as having "no accepted medical use and a high potential of abuse." Schedule 1 also implied that the drugs were more dangerous than cocaine, methamphetamine, Vicodin, and oxycodone, a perception that was far from proven but became an institutionalized part of drug enforcement. Medical use ceased and research dwindled down to close to zero.
For years, research into hallucinogenic-assisted therapy was basically dormant, until the 1990s when interest started to revive. In the 2000s, the first modern clinical trials of psilocybin were done by Francisco Moreno at the University of Arizona and Matthew Johnson at Johns Hopkins. Scientists in the 2010s, including Robin Carhart-Harris, started studying the use of psychedelics in the treatment of major depressive disorder (MDD).
In small trials with these patients, results showed significant and long-term improvement (for at least six months) after only two episodes of psilocybin-assisted therapy. In several studies, the guided experience of administering one of the psychedelic drugs along with psychotherapy seemed to result in marked improvement in a variety of disorders, including depression, anxiety, PTSD, and addiction.
The drugs allowed patients to experience a radical reframing of reality, helping them to become "unstuck" from the anxious and negative tape loops that played in their heads. According to Michael Pollan, an American author and professor of journalism who wrote the book, "How to Change Your Mind: What the New Science of Psychedelics Teaches Us About Consciousness, Dying, Addiction, Depression and Transcendence," psychedelics allow patients to see their lives through a kind of wide angle, where boundaries vanish and they're able to experience "consciousness without self." This perspective is usually accompanied by profound feelings of oneness with the universe.
Pollan likens the effect to a fresh blanketing of snow over the deep ruts of unproductive thinking, which characterize depression and other mental disorders. Once the new snow has fallen, the ruts disappear and a new path can be chosen. Relief from symptoms comes immediately, and in numerous studies, is sustained for months.
In spite of growing evidence for the safety and efficacy of psychedelic-assisted psychotherapy, the practice has major hurdles to cross on its quest for FDA approval.
Some of the most influential studies have focused on testing the use of psilocybin to treat end-of-life anxiety in patients diagnosed with a terminal illness. In 2016, Stephen Ross and colleagues tested a single dose of psilocybin on 29 subjects with end-of-life anxiety due to a terminal cancer diagnosis. A control group received a niacin pill. The researchers reported that of the 29 receiving psilocybin, all of the patients had "immediate, substantial, and sustained clinical benefits," even after six months.
In spite of growing evidence for the safety and efficacy of psychedelic-assisted psychotherapy, the practice has major hurdles to cross on its quest for FDA approval. The National Institutes of Health is not currently supporting any clinical trials and the research relies on private sources of funding, often with small research organizations that cannot afford the high cost of clinical trials.
Given the controversial nature of the drugs, researchers in psychedelic-assisted therapies may be cautious about publicity. Leapsmag reached out to several leaders in the field but none agreed to an interview.
Looking Ahead
Still, interest is building in the combination of psychedelic drugs and psychotherapy for treatment-resistant mental illnesses. Two months ago, Johns Hopkins University launched a new psychedelic research center with an infusion of $17 million from private investors. The center will focus on psychedelic-assisted therapies for opioid addiction, Alzheimer's disease, PTSD and major depression, to name just a few. Currently, of 51 cancer patients enrolled in a Hopkins study, more than half reported a decrease in depression and anxiety after receiving therapy with psilocybin. Two thirds even claimed that the experience was one of the most meaningful of their lives.
It is not unheard of for Schedule 1 drugs to make their way into medical use if they're shown to provide a bonafide improvement in a medical condition through well-designed clinical trials. MDMA, for example, has been designated a Breakthrough Therapy by the FDA as part of an Investigational New Drug Application. The FDA has agreed to a special protocol assessment that could speed up phase three clinical trials. The next step is for the data to be submitted to the FDA for an in-depth regulatory review. If the FDA agrees, MDMA-assisted therapy could be legalized.
Will the positive buzz around psychedelics persuade the NIH to provide the millions of dollars needed to push the field forward?
Robin Carhart-Harris believes the first drug that will receive FDA clearance is psilocybin, which he speculates could become legal in the next five to ten years. However, the field of psychedelic-assisted therapy needs more and larger clinical trials, preferably with the support of the NIH.
As Rucker and colleagues noted, the scientific literature bends toward the theme that the drugs are not necessarily therapeutic in and of themselves. It's the use of hallucinogens within a "psychologically supportive context" with a trained expert that's helpful. It's currently unknown how many users of recreational drugs are self-medicating for depression, anxiety, or other mental illnesses. But without the guidance of a knowledgeable psychotherapist, those who are self-medicating may not be helping themselves at all.
Will the positive buzz around psychedelics persuade the NIH to provide the millions of dollars needed to push the field forward? Given the changing climate in public opinion around these drugs and the need for breakthroughs in mental health therapies, it's possible that in the foreseeable future, this bold new therapy will become part of the mental health arsenal.
How 30 Years of Heart Surgeries Taught My Dad How to Live
[Editor's Note: This piece is the winner of our 2019 essay contest, which prompted readers to reflect on the question: "How has an advance in science or medicine changed your life?"]
My father did not expect to live past the age of 50. Neither of his parents had done so. And he also knew how he would die: by heart attack, just as his father did.
In July of 1976, he had his first heart attack, days before his 40th birthday.
My dad lived the first 40 years of his life with this knowledge buried in his bones. He started smoking at the age of 12, and was drinking before he was old enough to enlist in the Navy. He had a sarcastic, often cruel, sense of humor that could drive my mother, my sister and me into tears. He was not an easy man to live with, but that was okay by him - he didn't expect to live long.
In July of 1976, he had his first heart attack, days before his 40th birthday. I was 13, and my sister was 11. He needed quadruple bypass surgery. Our small town hospital was not equipped to do this type of surgery; he would have to be transported 40 miles away to a heart center. I understood this journey to mean that my father was seriously ill, and might die in the hospital, away from anyone he knew. And my father knew a lot of people - he was a popular high school English teacher, in a town with only three high schools. He knew generations of students and their parents. Our high school football team did a blood drive in his honor.
During a trip to Disney World in 1974, Dad was suffering from angina the entire time but refused to tell me (left) and my sister, Kris.
Quadruple bypass surgery in 1976 meant that my father's breastbone was cut open by a sternal saw. His ribcage was spread wide. After the bypass surgery, his bones would be pulled back together, and tied in place with wire. The wire would later be pulled out of his body when the bones knitted back together. It would take months before he was fully healed.
Dad was in the hospital for the rest of the summer and into the start of the new school year. Going to visit him was farther than I could ride my bicycle; it meant planning a trip in the car and going onto the interstate. The first time I was allowed to visit him in the ICU, he was lying in bed, and then pushed himself to sit up. The heart monitor he was attached to spiked up and down, and I fainted. I didn't know that heartbeats change when you move; television medical dramas never showed that - I honestly thought that I had driven my father into another heart attack.
Only a few short years after that, my father returned to the big hospital to have his heart checked with a new advance in heart treatment: a CT scan. This would allow doctors to check for clogged arteries and treat them before a fatal heart attack. The procedure identified a dangerous blockage, and my father was admitted immediately. This time, however, there was no need to break bones to get to the problem; my father was home within a month.
During the late 1970's, my father changed none of his habits. He was still smoking, and he continued to drink. But now, he was also taking pills - pills to manage the pain. He would pop a nitroglycerin tablet under his tongue whenever he was experiencing angina (I have a vivid memory of him doing this during my driving lessons), but he never mentioned that he was in pain. Instead, he would snap at one of us, or joke that we were killing him.
I think he finally determined that, if he was going to have these extra decades of life, he wanted to make them count.
Being the kind of guy he was, my father never wanted to talk about his health. Any admission of pain implied that he couldn't handle pain. He would try to "muscle through" his angina, as if his willpower would be stronger than his heart muscle. His efforts would inevitably fail, leaving him angry and ready to lash out at anyone or anything. He would blame one of us as a reason he "had" to take valium or pop a nitro tablet. Dinners often ended in shouts and tears, and my father stalking to the television room with a bottle of red wine.
In the 1980's while I was in college, my father had another heart attack. But now, less than 10 years after his first, medicine had changed: our hometown hospital had the technology to run dye through my father's blood stream, identify the blockages, and do preventative care that involved statins and blood thinners. In one case, the doctors would take blood vessels from my father's legs, and suture them to replace damaged arteries around his heart. New advances in cholesterol medication and treatments for angina could extend my father's life by many years.
My father decided it was time to quit smoking. It was the first significant health step I had ever seen him take. Until then, he treated his heart issues as if they were inevitable, and there was nothing that he could do to change what was happening to him. Quitting smoking was the first sign that my father was beginning to move out of his fatalistic mindset - and the accompanying fatal behaviors that all pointed to an early death.
In 1986, my father turned 50. He had now lived longer than either of his parents. The habits he had learned from them could be changed. He had stopped smoking - what else could he do?
It was a painful decade for all of us. My parents divorced. My sister quit college. I moved to the other side of the country and stopped speaking to my father for almost 10 years. My father remarried, and divorced a second time. I stopped counting the number of times he was in and out of the hospital with heart-related issues.
In the early 1990's, my father reached out to me. I think he finally determined that, if he was going to have these extra decades of life, he wanted to make them count. He traveled across the country to spend a week with me, to meet my friends, and to rebuild his relationship with me. He did the same with my sister. He stopped drinking. He was more forthcoming about his health, and admitted that he was taking an antidepressant. His humor became less cruel and sadistic. He took an active interest in the world. He became part of my life again.
The 1990's was also the decade of angioplasty. My father explained it to me like this: during his next surgery, the doctors would place balloons in his arteries, and inflate them. The balloons would then be removed (or dissolve), leaving the artery open again for blood. He had several of these surgeries over the next decade.
When my father was in his 60's, he danced at with me at my wedding. It was now 10 years past the time he had expected to live, and his life was transformed. He was living with a woman I had known since I was a child, and my wife and I would make regular visits to their home. My father retired from teaching, became an avid gardener, and always had a home project underway. He was a happy man.
Dancing with my father at my wedding in 1998.
Then, in the mid 2000's, my father faced another serious surgery. Years of arterial surgery, angioplasty, and damaged heart muscle were taking their toll. He opted to undergo a life-saving surgery at Cleveland Clinic. By this time, I was living in New York and my sister was living in Arizona. We both traveled to the Midwest to be with him. Dad was unconscious most of the time. We took turns holding his hand in the ICU, encouraging him to regain his will to live, and making outrageous threats if he didn't listen to us.
The nursing staff were wonderful. I remember telling them that my father had never expected to live this long. One of the nurses pointed out that most of the patients in their ward were in their 70's and 80's, and a few were in their 90's. She reminded me that just a decade earlier, most hospitals were unwilling to do the kind of surgery my father had received on patients his age. In the first decade of the 21st century, however, things were different: 90-year-olds could now undergo heart surgery and live another decade. My father was on the "young" side of their patients.
The Cleveland Clinic visit would be the last major heart surgery my father would have. Not that he didn't return to his local hospital a few times after that: he broke his neck -- not once, but twice! -- slipping on ice. And in the 2010's, he began to show signs of dementia, and needed more home care. His partner, who had her own health issues, was not able to provide the level of care my father needed. My sister invited him to move in with her, and in 2015, I traveled with him to Arizona to get him settled in.
After a few months, he accepted home hospice. We turned off his pacemaker when the hospice nurse explained to us that the job of a pacemaker is to literally jolt a patient's heart back into beating. The jolts were happening more and more frequently, causing my Dad additional, unwanted pain.
My father in 2015, a few months before his death.
My father died in February 2016. His body carried the scars and implants of 30 years of cardiac surgeries, from the ugly breastbone scar from the 1970's to scars on his arms and legs from borrowed blood vessels, to the tiny red circles of robotic incisions from the 21st century. The arteries and veins feeding his heart were a patchwork of transplanted leg veins and fragile arterial walls pressed thinner by balloons.
And my father died with no regrets or unfinished business. He died in my sister's home, with his long-time partner by his side. Medical advancements had given him the opportunity to live 30 years longer than he expected. But he was the one who decided how to live those extra years. He was the one who made the years matter.