For Huntington’s Disease Awareness Month, reflections on teaching about this devastating disorder at the University of San Diego

  

First proclaimed by President George H. W. Bush in 1991, Huntington’s Disease Awareness Month (May) encourages affected families to share their stories about this rare neurological disorder with the wider world.

 

For that reason, among others, I served on the board of the San Diego Chapter of the Huntington’s Disease Society of America (HDSA) from 1998-2010. In this blog, begun in 2005, I have written articles commemorating HD Awareness Month.

 

A 2019 posting about HD Awareness Month featured a photo of me pointing to HDSA #LetsTalkAboutHD flyers posted on my office door at the University of San Diego (USD), where I teach history and research science and technology studies.

 

As a fulfillment of a long-term goal to advance both awareness-building and deepen my knowledge of HD science, in the spring semester of 2025 I inaugurated a new course, A History of the Brain: Examining Huntington’s Disease. Professors often say that the best way to learn a subject is to teach it. Student feedback is crucial in this process.

 

This month, in the third offering of the course, I distributed a flyer containing HD Awareness Month promotional material from HDSA and the Huntington’s Disease Foundation.

 

Each holding a flyer, three students – Ana-Lucia Moreno, Ava Puorro, and Mia Wilde – had a picture of me taken with them in the classroom and posted it on Wilde’s Instagram with the title “National Huntington’s Disease Awareness Month.”

 

“Best class ever with Dr. Serbin, who has Huntington’s disease and taught us so much about it in class!” they wrote on the posting.

 

They included the link to this blog. “Watch his blog to learn more about HD and how we can make all people feel included.”

 

 

From left to right, Mia Wilde, Gene Veritas (aka Kenneth P. Serbin), Ana-Lucia Moreno, and Ava Puorro in Wilde’s Instagram post about HD Awareness Month. The jacket I am wearing is much-appreciated swag from the Annual HD Therapeutics Conference, sponsored by CHDI Foundation, Inc., the biggest private funder of HD research (personal photo).

 

Keys to understanding the history of HD

 

A History of the Brain has great relevance to the present. At the outset, I acknowledge that I am not a neuroscientist but a historian, HD gene carrier, and advocate.

 

An introductory course that fulfills the history requirement in USD’s core curriculum, A History of the Brain teaches basic skills in how to interpret history. The students have a wide variety of majors and career interests, including premed, neuroscience, biotech, business, natural sciences, engineering, and the humanities. The course also counts towards a major or minor in history.

 

I lecture on the basic scientific understanding of the brain from antiquity to the present, based on the masterful book by Andrew P. Wickens, A History of the Brain: From Stone Age surgery to modern neuroscience. It helps provide an overview of humanity’s understanding of the brain in understandable terms.

 

To launch discussion about the disease, students do short writing assignments based on the course readings. They include neurologist Thomas Bird’s Can You Help Me? Inside the Turbulent World of Huntington Disease. As I stated in my review of the book, “With non-technical, limpid prose, Dr. Bird tells the full story of HD’s wide-ranging medical, socioeconomic, and legal implications through a series of poignant vignettes, based on hundreds of HD cases."

 

The students also read two classic works by prominent HD family member and historian Alice Wexler, Ph.D. In The Woman Who Walked into the Sea: Huntington’s and the Making of a Genetic Disease, Dr. Wexler explains the deep stigma and misunderstanding about HD that developed in the nineteenth and twentieth centuries. In Mapping Fate: A Memoir of Family Risk and Genetic Research she chronicles the crucial work by her family and a myriad of scientists to discover the huntingtin gene in 1993.

 

Emotional debates and discussions

 

Many days in the course produce deeply emotional debates and discussions.

 

My students’ recognition of the need for social inclusion for all echoes the course’s deep exploration of the stigma and discrimination associated with HD, other neurological disorders, mental illness, and disabilities.

 

Those themes emerge in the books about HD and in the selection of articles from my blog included in the course readings. For its contributions in giving a voice to the HD community, last year my blog received the 11th Victor Gonzalez Santos Community Award, which supports local families in San Diego with HD. My articles, which include stories of my family’s struggles with HD, and my discussions with the students add a deeply personal element to HD and the cause to defeat it.

 

The course studies in details HD’s triad of devastating symptoms: involuntary movements, cognitive loss, and behavioral and psychiatric difficulties. We also delve into many other difficult challenges faced by the HD community, such as genetic testing, family planning, and bioethical issues like abortion and suicide. We also discuss the quest for treatments of this still incurable disorder.

 

Students see how I bared my heart in blog articles like the one about my mother’s final moments before dying from HD and the revelation that I carried the HD gene. As a result, I need to be prepared to talk in class about the most devastating aspects of the disease and the fears of experiencing them myself.

 

College classes provide an exercise in intellectual freedom and debate, with a professor being open to all views. In one class last year we intensely debated police misunderstanding and mishandling of HD-affected individuals, who are often seen as being under the influence of drugs or alcohol.

 

I introduced the students to something new for most of them: the Psychiatric Emergency Response Team, which has specialists trained to interact with and identify resources for those with behavioral health issues and who may pose a threat to themselves or others. The students concluded that this team was the appropriate alternative to calling the police in the case of HD or other disorder.

 

Invaluable insights

 

The course closes with an important religious perspective on the HD cause. We ponder the question, “how could God allow people to suffer from disease?” We examine Pope Francis’s historic audience with the HD community in 2017 and his declaration that HD should be “hidden no more!”

 

One of my projects at USD is to publish an annotated collection of about a dozen or some of my blog articles.

 

My interaction with the students and their thoughts on my blog and the HD cause will provide invaluable insights for that project.

 

A ‘very meaningful’ experience

 

The course has also underscored for me the fact that Huntington’s disease is still not a household word in the U.S. as compared to Alzheimer’s, Parkinson’s, ALS (amyotrophic lateral sclerosis), and other disorders. For most of the students, it is their first exposure to HD.

 

HD families still lack an effective therapy.

 

In a very poignant way, the course introduces young people to something we all share: mortality. Tragically, last year a vibrant and accomplished 42-year-old USD sociology professor, Greg Prieto, Ph.D., died of cancer – after offering his own reflections on facing death.

 

With A History of the Brain, I hope to have move us a bit further towards the greater awareness that the HD community still needs.

 

My students’ HD Awareness Month Instagram post is an example of the impact the course has had.

 

In an e-mail to me, Mia Wilde reported that the post had some 600 views and 100 likes, “a really great amount of engagement.”

 

“Another person reached out asking what Huntington’s disease was, so I gave them a brief overview about it being a hereditary disease and shared some of what we learned in class,” Wilde wrote.

 

Another person told Wilde that “it was such a thoughtful thing that we were doing because they had a friend who had Huntington’s disease before, which I thought was very meaningful to hear.”

CHDI chief scientist: ‘at the precipice’ of treatments, Huntington’s disease community must ‘persevere’ through the stress

  

As researchers have hypothesized that lowering (reducing) the amount of abnormal huntingtin protein in the brains of people afflicted with Huntington’s disease hits at the root causes of the disease, leading companies have sought to develop drugs in response, like uniQure’s AMT-130 gene therapy.

 

The huntingtin-lowering approach has become central to the search for disease-modifying therapies that slow, halt, or reverse the course of HD, a progressive disorder still without a treatment after the discovery of the huntingtin gene in 1993.

 

"We have multiple shots on goal in the huntington-lowering arena, things like uniQure, like PTC, like Skyhawk,” Robert Pacifici, Ph.D., chief scientific officer for CHDI Foundation, told me in a video interview on February 27. “While it's true that none of them have made it out the other end with a positive ruling in a pivotal Phase III trial, we're at the precipice of the types of signals that will indicate that there is a clinically meaningful benefit by lowering huntingtin.”

 

In our interview, Dr. Pacifici gave his customary overview of the CHDI-sponsored 21st HD Therapeutics Conference, held February 23-26 in Palm Springs.

 

Dr. Robert Pacifici (right), interviewed by Gene Veritas, aka Kenneth P. Serbin, February 27, 2026 (screenshot by Gene Veritas)

 

In my introduction, I noted that, because “it had a lot of progress,” scientifically this was the most “exciting” of the conferences that I have attended since my first in 2010.

 

However, I added, “there was stress for us in the HD community about the uniQure gene therapy program” because we were “shocked” at the abrupt backtracking of the U.S. Food and Drug Administration (FDA) on the drug despite its historic efficacy. This prompted two petitions with 48,000-plus signatures. I recalled that “so many of us in the community are still living with the burden of symptoms, including my sister, now disabled.”

 

Dr. Pacifici agreed that, until the arrival of an effective therapy, the HD community will have “some high degree of hope, but also a high degree of stress, because I think the closer we get, the more stressful it is that we're at the precipice of actually realizing this incredible journey.”

 

Dr. Pacific urged that people “continue to persevere.”

 

Watch my full interview with Dr. Pacifici in the video blow. 

 

 

A 75-percent slowing of the disease

 

At the Therapeutics Conference, a uniQure scientist presented an updated analysis of AMT-130 that “supports the validity” of its “efficacy results.”

 

With uniQure’s announcement last September that AMT-130 had demonstrated a 75 percent slowing in the progression of the disease over a three-year period, the HD community was jubilant (click here and here to read more).

 

Reports such as the BBC’s optimistically portrayed AMT-130.

 

HD and uniQure thrust into the national spotlight

 

Observers and news reports have described the Trump administration’s FDA as dysfunctional and more conservative. After the FDA surprisingly reversed field in November regarding AMT-130, the anxiety and raw tensions over the drug underscored the HD community’s yearning for an effective therapy.

 

On March 2 uniQure revealed that the FDA declined to accept its request to keep the agency’s original promise, in which the firm could apply for accelerated approval for AMT-130. Instead, the FDA “strongly recommended” that the company conduct a full-blown, Phase III clinical trial (click here to read more).

 

The controversy over AMT-130 has highlighted the FDA’s rejection of rare-disease drug programs, thrusting HD and uniQure into the national spotlight. Outlets providing coverage have included STAT, The New York Times, Bloomberg, CNN, CNBC, and the The Wall Street Journal.

 

On March 6 Vinay Prasad, M.D., the controversial head of the division within the FDA charged with evaluating gene therapies like AMT-130, resigned for the second time. While no reason was stated, the Times noted, leaders in the biotech and investor communities had long pressed the White House for his ouster.

 

Assisting the 60-plus companies involved

 

Dr. Pacifici told me that he was an “optimist” regarding the “interaction between the companies and the regulators,” who are “scientific people.”

 

“I truly believe that politics and money and all of the other perverse things that surround us, notwithstanding, that at the end of the day, the truth conquers all,” he said. “I think that they're going to look at the body of data and evidence, and eventually I think they're going to make the very best decision to get things out as quickly and as safely as possible to the patients who so desperately need these treatments.”

 

Because of the progress with huntingtin-lowering drugs like AMT-130, Dr. Pacifici noted that companies continue to allocate the “significant resources” necessary for Phase III trials.

 

The feedback from trials has enabled scientists to “hone the next generation of huntingtin-lowering therapies” and to address related questions, he added.

 

Dr. Pacifici emphasized that CHDI will continue to advise and assist uniQure and all companies seeking to develop HD therapies. More than 60 firms attended the Therapeutics Conference, which had a record attendance of 445.

 

Other key techniques

 

The conference also focused on other potential techniques in the search for therapies, such as the splicing of DNA “either to make less of a toxic protein or make more of a protein that is beneficial,” Dr. Pacifici explained.

 

Several presentations also discussed potential ways of impacting somatic expansion, the tendency of the abnormal huntingtin gene to expand over time to the point where symptoms are triggered.

 

Dr. Pacifici emphasized the need to intervene in the disease process long before symptoms arise.

 

“There's a long phase in Huntington's disease where people have the gene, but overtly, to at least the lay eye, look perfectly normal and healthy,” he explained. However, because they carry the genetic expansion, “deleterious things” can already occur, he added.

 

Another focus included the ongoing study of brain tissue donated by deceased HD-affected individuals, known as post-mortem tissue. This “unbelievably technological marvel of investigations can then look literally cell by cell at those post-mortem brain sections,” Dr. Pacifici explained.

 

Vast data from Enroll-HD

 

Dr. Pacifici and I both wore caps from Enroll-HD, the global registry of more than 22,000 affected individuals and relatives.

 

CHDI runs Enroll-HD, which provides free data to companies seeking to develop therapies.

 

uniQure’s use of Enroll-HD data as an external comparison for AMT-130 clinical trial participants caused the FDA to oppose the company’s request for an accelerated drug approval.

 

Dr. Pacifici called Enroll-HD “one of the most remarkable prospective registry trials that's ever been run.”

 

The Therapeutics Conference included a presentation on Enroll-HD’s whole-genome-sequencing – mapping a person’s entire DNA – of nearly 20,000 of the people in its database. Announced a year ago, this project has already generated 450 terabytes of data.

 

It has revealed some crucial new clues about the genetics of HD onset: new discoveries about potential modifier genes that slow or hasten the start of the disease.

 

Scientists learn much about HD from studying so-called animal models of the disease, but, as Dr. Pacifici reminded me, only humans actually get HD.

 

Enroll-HD safely and non-invasively collects people’s blood, semen, tears, cerebrospinal fluid and DNA and tracks their symptoms, Dr. Padcific said. Enroll-HD thus helps to answer the big question of “how the disease manifests itself in people” over time and how their individual genetics influence the disease.

 

People’s participation in Enroll-HD “makes a huge difference,” Dr. Pacifici observed, adding that the program is positioned to prepare for future research needs as the field evolves.

 

The ‘urgent necessity’ for a therapy

 

On March 5 Amy Gray, the president and CEO of the Huntington's Disease Society of America e-mailed the HD community an update on the controversy involving the FDA, AMT-130, and Enroll-HD.

 

Gray noted the “urgent necessity” of a disease-modifying treatment. She recalled that Congress had directed the FDA to apply “‘regulatory flexibility’ for rare diseases – tailoring approaches when traditional trials are not feasible or would unduly delay access.”

 

Gray added that “innovative trial designs” such as Enroll-HD are appropriate when scientifically justified.

 

“We appreciate uniQure’s stated intent to continue engaging with the FDA,” Gray wrote.

 

Conquering HD

 

Like last year, the 2026 meeting had a session on “new enabling technologies and breakthrough science for neurodegenerative diseases.”

 

“The techniques that people are using would literally have been considered science fiction five years ago,” Dr. Pacifici said.

 

These included a bioengineered “mini-brain,” using actual human cells, that assembled all of the different broad classes of cell types in the brain, Dr. Pacifici explained.

 

The mini-brain was developed and presented at the conference by Alice Stanton, Ph.D., of Massachusetts General Hospital and Harvard Medical School.

 

“We're going to get her to now introduce cells that have the expanded gene and see how that changes so that we could do experiments in a dish instead of in the living organism,” Dr. Pacifici said. "We've got the best, the brightest doing-state-of-the art work."

 

To fill remaining “gaps” and “solve bottlenecks” on the way to therapies, yet more discoveries will be needed, he added.

 

With CHDI’s multi-million-dollar resources, the involvement of big companies, and the participation of HD families, “we’re going to conquer this thing,” Dr. Pacifici predicted.

 

 

Dr. Alice Stanton presenting her talk on her human "mini-brain" invention (above) and taking questions from the audience (below) (photos by Gene Veritas)

 

 

uniQure’s AMT-130 at the forefront of 21st Huntington’s Disease Therapeutics Conference

  

AMT-130, the uniQure gene therapy that successfully slowed the progression of Huntington’s disease before being obstructed from approval by the U.S. Food and Drug Administration (FDA), stands at the forefront of the leading HD research conference that starts today, February 23, in Palm Springs, CA.

 

The 21st Annual Huntington’s Disease Therapeutics Conference, which I have described as the Super Bowl of HD research, takes place at the Parker hotel. It is sponsored by CHDI Foundation, Inc., the largest private funder of HD research.

 

“In recent years HD drug discovery has become increasingly anchored in strong human genetic and clinical evidence, allowing us to focus on mechanisms most likely to yield disease-modifying benefit,” wrote Robert Pacifici, Ph.D., the CHDI chief scientific officer, in his welcome letter to the conference attendees. “Few developments capture this momentum more clearly than the recent topline results announced by uniQure from the pivotal Phase I/II study of AMT-130 suggesting that lowering [decreasing] mutant huntingtin in people confers a real clinical benefit, an important proof of biological principle.”

 

Dr. Pacific did not refer to the FDA roadblock but asserted that the AMT-130 “findings represent an encouraging milestone for the HD community.”

 

For its clinical trial analysis uniQure has relied on the CHDI-backed Enroll-HD, the global registry of HD-affected individuals and their families. uniQure has presented its data at the therapeutics conferences.

 

Dr. Robert Pacifici, wearing a Team Hope shirt from the Huntington's Disease Society of America, overseeing the 2025 Therapeutics Conference (photo by Gene Veritas, aka Kenneth P. Serbin)

 

AMT-130 talk in the lead-off

 

Dr. Pacifici and the conference planners scheduled a report on AMT-130 as the first presentation at the start of the opening science session on February 24.

 

David Margolin, M.D., Ph.D., uniQure’s vice president for clinical development, will give a talk titled “AMT-130 slows Huntington's disease progression at 3 years: Propensity score weighting mitigates potential bias from striatal volume absence in Enroll-HD.”

 

Because AMT-130 has been administered via a spinal injection that involves 12-plus hours of surgery, uniQure had no placebo group – those not getting an operation –but instead chose to use data from Enroll-HD as a comparison group.

 

After extensive consultations with the FDA in 2024, uniQure had gotten permission from the agency to use the Enroll-HD data. In November 2025, the FDA told uniQure that Enroll-HD data might no longer be “adequate.”

 

The HD community mobilized immediately, garnering 48,000-plus signatures on two petitions delivered to FDA headquarters on January 22.

 

The abstract of Dr. Margolin’s presentation does not reference the FDA but states that the Enroll-HD data about loss of striatal volume (shrinkage in the striatum, located deep in the brain and severely affected in HD) was helpful in the analysis of the clinical trial data. He reasserted the importance of MRI measurements of such brain loss.

 

Awaiting news about the FDA

 

uniQure announced on January 9 that it had scheduled a high-priority meeting with the FDA, which according to regulations had to occur within 30 days. The FDA must produce final minutes of the meeting.

 

As of this writing, uniQure has not reported on the results of the meeting.

 

At the conference, the several hundred scientists, biopharma reps, and advocates like me will anxiously await the latest news on AMT-130.

 

Stay tuned for my reports on the event.

Wonderful news: uniQure’s one-and-done drug slows Huntington’s disease

 

AMT-130, a one-time gene therapy developed by uniQure, has successfully slowed the progression of Huntington’s disease.

 

While that is not a cure, and the therapeutic process is hardly simple, it is the first evidence that scientific progress translates into meaningful results for those suffering from HD.

 

The treatment is far more complex than a pill: it involves 12 to 18 hours of delicate brain surgery. A neurosurgeon injects AMT-130 directly into the brain under the guidance of an MRI. As a gene therapy, AMT-130 requires just this one application. (Watch the uniQure video about how AMT-130 is administered here).

 

According to clinical trial results reported by uniQure on September 24, AMT-130 achieved its main goal (primary endpoint) and demonstrated a 75 percent slowing in the progression of the disease over a three-year period.

 

“High-dose AMT-130 also demonstrated statistically significant slowing of disease progression as measured by TFC, a key secondary endpoint, and favorable trends across additional clinical measures,” the release stated. TFC is total functional capacity. It refers to a person’s ability to function – a key loss in HD.

 

Other progress

 

The company, based in Lexington, MA, and Amsterdam, reported that AMT-130 also reduced the measure of a protein known as neurofilament light, a marker of disease that reveals stress on the brain.

 

The clinical trial showed “favorable trends” in other second measures of motor (movement) and cognitive function, the release stated. Movement disorders and cognitive loss are major HD symptoms. Trial results demonstrated that AMT-130 is safe and well-tolerated.

 

“I believe these groundbreaking data are the most convincing in the field to date and underscore potential disease-modifying effects in Huntington’s disease, where an urgent need persists,” Sarah Tabrizi, M.D., Ph.D., a leading HD specialist at University College London, stated in the release. “These data indicate that AMT-130 has the potential to meaningfully slow disease progression – offering long-awaited hope to individuals and families impacted by this devastating disease.”

 

 

David Margolin, M.D., Ph.D., uniQure's vice president for clinical development, presents data illustrating ATM-130's slowing of the progression in Huntington's disease at the 20th Annual HD Therapeutics Conference, Palm Springs, CA, February 25, 2025 (photo by Gene Veritas, aka Kenneth P. Serbin).

 

Transforming the HD landscape

 

AMT-130 seeks to lower the amount of harmful mutant huntingtin protein in the brain cells of patients. Whether the drug has actually done this has yet to be verified.

 

In early 2026, uniQure plans to apply to the U.S. Food and Drug Administration (FDA) for drug approval. Pending drug approval, the drug would be launched in the U.S. later in 2026.

 

“We are incredibly excited about these topline results and what they may represent for individuals and families affected by Huntington’s disease,” stated Walid Abi-Saab, M.D., chief medical officer of uniQure. “These findings reinforce our conviction that AMT-130 has the potential to fundamentally transform the treatment landscape for Huntington’s disease, while also providing important evidence supporting one-time, precision-delivered gene therapies for the treatment of neurological disorders.”

 

Hopes for a life-long treatment

 

“This is the first time any drug has been shown to alter the course of HD in people in a clinical trial,” the scientist-written website HDBuzz stated. “uniQure believes that AMT-130 has the potential to be a treatment that lasts for life.”

 

uniQure officials told HDBuzz that, beyond the FDA, they plan to seek approval with other regulators, including the European Medicines Agency, which oversee drug approvals in Europe.

 

HDBuzz cautioned that key details need to be worked out before AMT-130 can be administered to a large group of people beyond the fewer than 30 people whose data were analyzed by uniQure.

 

Only some of those individuals received the high dose of the drug that proved effective. Also, because AMT-130 requires an operation, the company must find a way to provide access to the drug, and at an affordable level, to a larger number of people.

 

On the whole, despite the caveats and complexities, this is wonderful news for the HD community.

 

"We never in our wildest dreams would have expected a 75% slowing of clinical progression," Dr. Tabrizi told the BBC.

With ‘great promise’ for treating Huntington’s disease, four drug programs press ahead (Part I)

 

At the recent 20th Huntington’s Disease Therapeutics Conference, four companies provided updates on their key clinical trial programs, demonstrating that they had overcome basic safety hurdles and revealing plans to have their drugs potentially approved as therapies (treatments) for delaying the progression of HD symptoms.

 

PTC Therapeutics, Roche, Wave Life Sciences, and uniQure made 15-minute presentations. This clinical trials update took place during the first session on February 25, the first day of the three-day event.

 

Sponsored by the nonprofit CHDI Foundation, Inc., the largest private funder of HD research, the conference took place in Palm Springs, CA.

 

Possible impact

 

All four programs use drugs to lower the amount of harmful mutant huntingtin protein in the brain cells of patients. Blocking the bad protein could help prevent the death of brain cells, a major driver of HD.

 

In a post-conference interview with me, CHDI Chief Scientific Officer Robert Pacifici, Ph.D., said that the companies’ plans to move their programs towards drug approval is “great news.”

 

“All of them expressed their commitment to moving forward with their interventions, and that’s not trivial,” Dr. Pacifici said. “That means a lot of time, a lot of money invested on their part. They wouldn’t be doing it if they didn’t think there was great promise there.”

 

Each firm has overcome the basic safety hurdles necessary for moving to a Phase 3 clinical trial, the final step before the U.S. Food and Drug Administration (FDA) approves a drug, Dr. Pacifici added.

 

This article, the first of two, focuses on trials from PTC and Wave. Part II will examine the Wave and uniQure updates.

 

Votoplam, a potential pill for HD

 

With 60 companies represented at the conference, CHDI selected those “that had something new to say” in terms of clinical development, Dr. Pacifici told the attendees.

 

Amy-Lee Bredlau, M.D., PTC’s senior medical director, began her talk on the company’s huntingtin-lowering drug by noting progress: the compound, PTC518, is now called votoplam, a nonproprietary drug name assigned by PTC’s new, larger partner on the project, the international pharmaceutical firm Novartis.

 

“I think this is a really great collaboration,” Dr. Bredlau said.

 

As Dr. Bredlau explained, votoplam is a huntingtin splicing modulator, reducing the production of both the mutant and normal huntingtin proteins.

 

In contrast with riskier delivery methods, some presented in the session, votoplam is a pill. That makes it easy for patients to take the drug.

 

CHDI and PTC started the search for a huntingtin-lowering pill with a joint project initiated in 2018.

 

A delay in HD progression

 

PTC ran a successful Phase 1 clinical trial of votoplam in 2020 and 2021, providing initial evidence of safety and the lowering of the huntingtin protein.

 

At the conference, in an interim analysis, Dr. Bredlau presented data from the first 32 of the 156 volunteers enrolled in PIVOT-HD, PTC’s one-year global Phase 2 trial, which has verified the safety and tolerability of the substance. The first group of participants in PIVOT-HD began in 2022.

 

PIVOT-HD demonstrated that, by the third month, votoplam enters trial volunteers’ brains and lowers the huntingtin protein, she said. At month 12, the lowering was sustained. The trial also showed no spikes in neurofilament light chain (Nfl), a protein whose presence indicates degeneration of brain cells in diseases like HD. Scientists hope that lowering huntingtin will limit Nfl.

 

Significantly, Dr. Bredlau observed that these volunteers had a delay in the progression of HD symptoms, as indicated by several key clinical measures.

 

She said PTC is “very excited” about those trends, which “look very promising,” adding that “we’re really hopeful that we’ll see a strengthening of the signal at the end of the 12-month study,” when results from the remaining volunteers will be studied.

 

PTC will release full results of PIVOT-HD in this (second) quarter of 2025, said Dr. Bredlau, adding that the firm hopes that the results secure permission for a Phase 3 trial, to be run by Novartis.

 

Dr. Amy-Lee Bredlau of PTC Therapeutics presents data from the PIVOT-HD clinical trial demonstrating trends of a delay in progression of Huntington's disease symptoms (photo by Gene Veritas, aka Kenneth P. Serbin).

 

GENERATION HD2 fully in progress

 

Peter McColgan, M.D, Ph.D., global development leader for Roche, updated the pharmaceutical giant’s HD program. He focused on the Phase 2 trial of the huntingtin-lowering drug tominersen.

 

Tominersen is an antisense oligonucleotide – a “laser-guided missile” against HD – originally developed by Ionis Pharmaceuticals, Inc. Like votoplam, tominersen lowers both the normal and mutant huntingtin protein.

 

After Roche’s unsuccessful trial of tominersen in 2021, the company redesigned a less ambitious and more focused trial of the drug in people less affected by the disease. Called GENERATION HD2, it started in early 2023.

 

Dr. McColgan reported that GENERATION HD2, by January, had fully recruited its target of 301 volunteers at 70 sites in 15 countries.

 

“This is a massive achievement,” he said.

 

The trial will assess tominersen’s safety, the use of biomarkers (signs of a disease and a medication’s efficacy), and the drug’s effectiveness.

 

Tominersen is not a pill. It is administered via a spinal tap.

 

Roche aims to complete the trial by the end of 2026.

 

Dr. Peter McColgan of Roche with a slide showing the global recruitment for the GENERATION HD2 clinical trial (photo by Gene Veritas)

 

Roche’s multiple approaches

 

Dr. McColgan also described how Roche has expanded its focus to include other possible HD treatments and related research.

 

“We believe the fastest way to get treatments to patients is to pursue multiple programs in parallel,” Dr. McColgan said.

 

In collaboration with its colleagues at Spark Therapeutics – acquired by Roche in 2019 – Roche scientists are exploring other potential molecules for targeting HD. Spark specializes in gene therapies.

 

HD researchers continue to weigh the approach of drugs such as votoplam and tominersen, which lower both the mutant and normal huntingtin protein, versus those that attack only the mutant. The latter types are known as allele-selective. They leave the normal protein to carry out its essential actions unhampered.

 

Dr. McColgan said that Roche and Ionis are investigating an allele-selective antisense oligonucleotide.

 

Roche is also participating in the HD Regulatory Science Consortium. Using data from the original tominersen trial and other patient data, this collaboration seeks to improve the measurement of clinical trial volunteers’ performance in clinical trials, said Dr. McColgan.

 

Roche is also collaborating with CHDI to improve the measurement of Nfl (neurofilament light chain) as a key biomarker.

 

“Nfl increases across the stages of HD,” Dr. McColgan observed.

 

The latest news on tominersen

 

All clinical trials are regularly checked by an independent data monitoring committee.

 

Volunteers in the tominersen trial not on placebo have received either 60mg or 100mg of the drug.

 

On April 17 Roche issued a letter to the HD community stating that the committee overseeing the tominersen trial has found “no concerns … regarding participant safety or signs of symptom worsening with either tominersen dose.”

 

In addition, the letter said, “the 100mg dose was found to be more likely than the 60mg dose to result in clinical benefit. Therefore for the remainder of the study only the 100mg dose will be tested against placebo, and the 60mg dose will be discontinued.” Those receiving 60mg will now get 100mg.

 

“We are incredibly grateful to the 301 participants and their companions enrolled in GENERATION HD2,” the letter stated. “Each study visit contributes to collecting data that helps the entire HD research community learn more about tominersen, Huntingtin-lowering strategies, and the further understanding of HD.”

 

In Part II of this article I will report on Wave’s and uniQure’s clinical trial updates

 

(Disclosure: I hold a symbolic amount of Ionis shares.)