In one of
the most difficult years emotionally in the fight to conquer Huntington’s
disease, advocates, scientists, and HD-affected individuals have generated hope
as 2021 draws to a close.
The
“heartbreaking” news in March about the disappointing results
of the greatly anticipated Roche and Wave Life Sciences clinical
trials was compounded by the devastating, ongoing coronavirus pandemic.
Last year
at this time, leading global HD advocate Charles Sabine, a British former international
correspondent for NBC-TV, launched his inspiring film Dancing at the Vatican, about Pope Francis’
embrace of the global HD community, on YouTube.
Like the
pope’s 2017 special audience with the HD community in Rome, Dancing at the
Vatican brought great hope and joy.
Now Sabine
has just released another heartening film, Hoping Machine, a 60-minute
documentary that, he says, “encapsulates many core principles” of the pope’s
declaration that it is time for HD to be “hidden no more”: the “corrosive
nature of denial and hidden secrets” and the “empowerment that springs from
knowledge, understanding, collaboration and community.”
“I truly
believe Hoping Machine offers the most important perspective that anyone
involved in HD right now – researchers, clinicians or families – could hear,”
Sabine wrote me by e-mail.
You can
watch Hoping Machine for free by clicking on this link.
Powerful
HD journeys
Hoping Machine takes its title from the song by
American folk music giant Woody Guthrie, who died from HD in 1967, the
year his former wife Marjorie
founded the Huntington’s Disease Society of America (HDSA).
The film
depicts the gripping recollections of HD family members, and also several
scientists, of their experiences as keynote speakers at what I have called the
“Super Bowl” of HD research, the annual
Huntington’s Disease Therapeutics Conference. Beginning in 2006, the conferences are sponsored by CHDI Foundation, Inc., the abundantly funded, nonprofit
virtual biotech aimed solely at developing HD therapies.
These
speakers have all told powerful stories about their HD journeys, including
using the keynote to go public about their HD status for the first time (my case in 2011) and exploring the most intimate
and difficult aspects of life with HD.
Inspired
by the scientists’ dedication
They have
also sought to both inspire and thank the scientists.
“Here I
am, affected by Huntington's disease, and I'm relying on all of you guys, all
of the scientists, everybody working in the HD community,” keynoter Amy Merkel
recalled of her talk in Palm Springs, CA, in February 2020. “I'm relying on
you for life.”
Sometimes,
when she has experienced symptoms, “I just kinda wanted to crawl under the
covers and stop trying,” Merkel continued. “That speech and that time in Palm
Springs kind of lifted me a little. You can do this.”
A licensed
practical nurse, Merkel had abandoned her “dream” of becoming a registered
nurse (RN) “because I knew I was gene-positive” for HD, she said. However, “the
advances that all of the scientists have made in Huntington’s research”
convinced her to study to become an RN.
Amy achieved her goal: "I'm a registered nurse, and I currently am working as a sexual abuse nurse examiner in southern Arizona."
Amy Merkel poses with researchers Dr. Sarah
Tabrizi (far left), Leslie Thompson, Ph.D. (second from right), and Gillian
Bates, Ph.D. (far right), at the 15th HD Therapeutics Conference, held in in Palm Springs,
CA, February 2020 (photo by Gene Veritas, aka Kenneth P. Serbin).
Good news
from the KINECT-HD trial
Another
glimmer of hope – and a sign that HD science marches on – came on December 7
with the release of “positive” data from the KINECT-HD phase 3 clinical trial to test the efficacy, safety, and
tolerability of Neurocrine Biosciences’ drug valbenazine. The initial
trial data demonstrated that valbenazine, as intended, reduced chorea, the
involuntary, dance-like movements that are the principal motor symptom of HD.
Marketed
by San Diego-based Neurocrine as Ingrezza and already approved by the U.S. Food
and Drug Administration (FDA) for the neurological disorder tardive dyskinesia, valbenazine is the same type of
drug as the two other FDA-authorized drugs for chorea, Xenazine
(2008) and Austedo (2017).
According
to the Neuocrine press release, Ingrezza reduced the total motor
score (a measure of the severity of chorea) by 3.2 points versus placebo in the
trial participants.
This
result was very close to reduction of the 2.5 points in Austedo and the 3.5
points in Xenazine.
As the
release explained, the total motor score is part of the motor assessment of the
research tool known as the Unified Huntington’s Disease Rating Scale (UHDRS®) and “measures chorea in seven
different body parts, including the face, oral-buccal-lingual region, trunk and
each limb independently.” The total motor score is the sum of the individual
scores and ranges from 0 to 28.
Like
Xenazine and Austedo, valbenazine is a VMAT2 inhibitor.
Initial
data about Austedo (deutetrabenazine) indicated that patients “felt better”
overall after taking this drug. In addition, Austedo requires only two daily
doses, versus Xenazine’s three (click here to read more).
Ingrezza
is even more convenient: the KINECT-HD trial used just one daily dose.
Critical:
no suicidal behavior observed
Critically,
and also in contrast with the other two drugs, “no suicidal behavior or worsening
of suicidal ideation was observed in the valbenazine-treated subjects in this
study,” the Neuocrine statement said.
Neocrine
partnered in KINECT-HD with the Huntington Study Group (HSG), the leading HD
clinical trial administrator and research platform. In a first for the HSG,
KINECT-HD trial participants used wearable sensors for continuous monitoring of
their movements and other biological functions, even at home. (Click here to read more.)
In 2022, after
a complete review of the trial data, Neocrine will report its findings in
greater detail at a medical conference, and it will submit the drug for FDA
approval for use in HD.
“The
positive results of the KINECT-HD study are very exciting for the HD community,”
Jody Corey-Bloom, M.D., Ph.D., the director of the HDSA Center of Excellence at
the University of California, San Diego, wrote me on e-mail. “Although valbenazine
is not a disease-modifying therapy, it will clearly be a highly effective
therapeutic option for one of the most common symptoms in HD – chorea.”
“Completing ANY clinical research trial successfully in
the midst of the COVID-19 pandemic is cause for excitement, and a
testament to the tenacity of HD patients, families, and research teams,”
wrote Martha Nance, M.D., the Center of Excellence director at Hennepin Health
Care in Minneapolis, MN. “The favorable results are not terribly surprising,
since two other similar drugs have been approved previously – but they are
certainly reassuring.”
Maintaining the commitment to
patients
The “holy grail” for the HD field – and other neurological diseases – is a treatment that
prevents people from ever developing symptoms.
Comparing Ingrezza’s success with this bigger challenge, Dr.
Nance offered a partial explanation to what she described as a large and
complex challenge.
“It only takes a few weeks or months to document that a drug
reduces the severity of a symptom (chorea, depression, insomnia), but takes
years to show that a drug is slowing the progression of a disease that
progresses slowly over years,” she wrote. “We have not gained a toehold on
slowing nerve cell loss in any of these conditions.”
However, because the scientists have advanced to attempting
treatments aimed at the disease’s roots – DNA and RNA – “there is good reason
to hope.”
“Building on the unsuccessful trials that were so
disheartening to the global HD community earlier this year, I counted no fewer than
thirteen companies moving towards clinical trials of DNA/RNA-directed
treatments at our recent HSG research conference
in November,” she noted.
Dr. Nance wrote that we should be “thrilled” that 2021
has ended on a favorable research result and “maintain our commitment to work
together to find better treatments for the HD patients of the future.”