Meniere’s disease is one of the toughest conditions for otolaryngologists to successfully treat. In this episode, Hugo Peris, CEO of Spiral Therapeutics and their Chief Medical Officer, Dr. Charles Limb, shed light on their company’s clinical trials involving a new drug delivery system for treatment of Meniere’s disease.
Full Episode Transcript
Brian Taylor: Hello, and welcome
to another episode of This Week
in hearing, I’m Brian Taylor. My
guest today are Hugo Peris who’s
the CEO of Spiral Therapeutics.
And with him today is their
chief medical officer, Dr.
Charles Limb. And they’re here
today to make us a little
smarter on the topic of auditory
regenerative medicine, and some
of the important work that their
company is doing in this area.
And before I start asking them
some questions, and having them
they’ll tell us about their,
their studies and their
projects. I’d like them to maybe
start by telling our audience a
little bit about themselves and
about their company Spiral
Therapeutics. So Hugo, I’ll go
ahead and start with you.
Hugo Peris: Thank you, Brian.
And thank you for having us
today. It’s a pleasure to talk
to you. So Spiral started in
2016. As a hearing company,
we’ve been working for the last
seven years on advancing our
pipeline of hearing
therapeutics. And we’re
currently focused on developing
a treatment for many years
disease, which is already in the
clinic.
Brian Taylor: Great. And Dr.
Limb, you’re the chief medical
officer, can you tell us a
little bit about your background
and what you do at spiral
therapeutics?
Charles Limb: Absolutely. And
thanks, Brian, for having us. So
I’m a neuro otologist. I’m
currently the Francis A. Sooy
Professor and chief of otology
neurotology. Skull base surgery
at University of California, San
Francisco. And when I moved to
UCSF it was after being at Johns
Hopkins Hospital for almost 20
years. And one of the great
things about moving to UCSF was
the opportunity to collaborate
with some of the advances in
industry. And so, Hugo had
approached me by now about six,
six and a half years ago to just
learn more about Spiral. And
that was at a point where I was
feeling some frustration with
what was available to us in our
standard clinical approaches to
hearing loss. And so I found
just great excitement and energy
in the idea of looking outside
the box and just sort of like
thinking about alternate ways to
get what our patients need. And
so with that kind of motivation,
I joined spiral as the Chief
Medical Officer where I still
continue to to treat patients
surgically at UCSF, but with
spiral have been working with
Hugo in the team to try to
advance these really important
developments in treating
Menieres disease and other
neurologic disorders.
Brian Taylor: I think that’s a
good a good springboard into the
My first question for you, I’ll
direct this to Dr. Lim. And that
is, and I think, I mean, this is
based on my own experience as an
audiologist working in ENT
practices years ago, and also
what I saw on your website, and
that is that something like 90%
of inner ear disorders are neuro
degenerative or inflammatory in
origin. So maybe you could give
us some examples for our
audience of of these types of
conditions that are commonly
seen in an ENT practice. And
then, as a follow up question
that give us maybe a little idea
historically of why those kinds
of conditions are so challenging
to treat.
Charles Limb: Yeah, so you know,
let’s be perfectly clear about
one thing, there’s no FDA
approved medications to treat
hearing loss today. If you think
about where we are in modern
medicine, and the fact that we
have the ability to restore
hearing with cochlear implants,
in somebody who’s deaf, the fact
that we don’t have a single
medication that can target
hearing loss is really kind of
astonishing. Also, if you are a
clinician, you realize very soon
that we don’t have a whole lot
to offer besides steroids. And
the unusual thing is that if you
list kind of a differential
diagnosis broadly of different
hearing loss conditions, whether
it’s sudden sensorineural,
hearing loss, Meniere’s disease,
noise induced hearing loss,
chemotherapeutic, ototoxicity,
and so forth, if you just kind
of go through all of the very
common ear disorders that lead
to hearing loss, you’ll find
that we treat all of those with
steroids. And the reason for
that is not that steroids are,
are used so perfectly in those
settings and indications it’s
that we don’t have anything else
that seems better right now. And
the linkage between those
conditions appears to be some
degree of neuro inflammation, or
cochlear inflammation that seems
to benefit from the anti
inflammatory effects of
steroids. And so the limitation
is partly in that we need more
specificity and not just one
medicine for all conditions, but
also that steroids are very,
very effective. You know,
they’re it’s an impressive
medication, but we need to be
able to use it better. And so a
lot of what we’ve been thinking
about that Spiral is how to get
something more effectively,
where it needs to get to so that
whatever the medicine, whether
it’s a steroid or something else
it can do its job better.
Brian Taylor: So maybe that
would be my next question would
be How does Spiral Therapeutics
attempt to solve some of the
problems that you just
mentioned?
Hugo Peris: Thanks, Brian. I’ll
take this one. So at spiral
we’ve been focusing on looking
at the space it’s been great
learning from a lot of the
companies that have been trying
to address this problems of the
inner ear and trying to advance
drugs. For a range of
indications, it’s been
interesting to us to see some of
the reasons why some of these
attempts have failed that
progressing towards the clinic
and towards approval. And we’ve
been trying to learn about this,
this failures and trying to
apply a different approach to
developing our treatments. The
first thing that we’ve looked
at, and one thing that we’re
very focused on is drug
delivery, we think drug delivery
is one of the biggest challenges
of access and of treating inner
ear disorders, systemic drugs,
or drugs supplied systemically
don’t reach the inner ear at
effective concentrations, for
the most part, because the
cochlea is beyond the blood
brain barrier. And we also know
that local delivery, the way
it’s been traditionally done
with blind intratympanic,
injections might not be the best
solution for effective and
reliable deployment of drug
treatments. So we’ve been
thinking about that. And we’ve
been building a drug delivery
platform, which allow us to
deploy drugs to the inner ear
more precisely, because we do
that still minimally invasively
and locally, but under
regionalization. And that day,
gives us the opportunity to
place drug delivery systems that
will last longer. And that will
be precisely placed so that we
can have that that effectiveness
of a treatment across every
patient that we treat in
clinical trials, and hopefully
beyond. So that’s been the core
of our technology and the focus
that we’ve been putting on in
developing our platform, then
once we build that, we’ve taken
this step of advancing treatment
for many years, and that’s a
steroid treatment that we
already have in the clinic, like
I explained before, this
treatment, we hope will help us
validate our platform, our drug
delivery platform, and we’re
also trying to take those
learnings from things that have
happened before in the field
from all the experience that has
been accumulated by companies,
and obviously all the physicians
that have been using steroids
for many, many years, a lot of
literature that has been
published about this, and trying
to make some changes, think
about what are the really
clinically meaningful outcomes
for for patients, in either
defying those, those results,
and making sure that we are
demonstrating that effect versus
a placebo treatment. So that’s
been the focus of the work. And
beyond that we’re going to
continue to advance a pipeline,
think about other indications in
you know, mostly related about
in hearing and neurodegeneration
of of the inner ear.
Brian Taylor: Well, that brings
me to the next question, which
is about the the recent
announcement about you’re
receiving funding for a phase
two trial of SPT2101. I hope I
have that. Right. Could you tell
us a little bit about that
trial? What’s the objective of
the trial? What are you trying
to achieve, and maybe a little
bit about the design of the
trial?
Charles Limb: Sure, maybe I can
take that one. So as Hugo
mentioned, SPT 2101, is a sort
of special steroid formulation
that we have, which we’re
delivering to the inner ear at
the round window. Under direct
visualization, using minimally
invasive approaches, we’ve
completed an initial phase one
study in Australia, and that
study was was quite promising.
And our goals with the phase two
study are to build upon what we
learned in phase one. And in
specific, we want to get the
technology in the hands of more
providers. And you know, anytime
you’re developing something like
this, it’s you’ve kind of come
up with the idea. And you’ve
sort of established a proof of
principle and proof of concept.
But now you have to actually see
how scale how scalable it is to
other practitioners. And so we
would like more otologists, to
now be involved. And so with
that goal in mind, we’re
launching a multicenter trial in
Australia, which just has just
begun in four sites in
Australia. The initial results
from the phase one study will be
published, published and
presented at the upcoming Asia
Pacific otolaryngology meeting
by one of our colleagues, Dr.
Jeffery Cooper thean. But the
phase two study will involve
more otologist that can be doing
this and with the goal of
refining our, our surgical and
in clinic procedural approaches,
but then also establishing
effect size parameters, you
know, we have a clear sense that
this treatment is effective. And
now we have to increase the
sample size and really learn
what the effect sizes are and
how they relate to our placebo
arms.
Brian Taylor: Is it I want to
make sure that I have this
right. The treatment is for
people that have been diagnosed
with Menieres disease, right?
Charles Limb: Correct. And so
what we’re doing is we’re
enrolling two patients with
active disease. You have to
basically be dizzy currently
with Menieres disease and we’re
looking at basically vertigo as
the primary endpoint vertical
control for Under these
conditions, were using a one
month run in period where the
patients have to report a
certain level of dizziness in
order to have the treatment so
that we can see if the treatment
helps them. And, you know, we’re
excited. You know, I would say
this, this is something that
we’ve, clinically people have
used steroids exactly for this
purpose for a long time, but the
outcomes have always been
variable. You know, there’s some
patients that seems to work
great for and others that it
doesn’t. And so what we’re
really trying to figure out is
how do we improve upon that so
that the steroids can really how
we can take advantage of the
full anti inflammatory power of
a steroid by putting it where it
needs to be placed in the ear
and knowing that it’s there for
that one particular patient.
Brian Taylor: yeah it’s really
great. I hope that the results
are favorable.
Charles Limb: As to we, ya no,
it’s exciting. And we, you know,
like the field needs something
and we are we’re actively
pursuing this with great, great
hopes and great ambition.
Brian Taylor: That’s great. Are
there any other drugs in the
pipeline that you plan to
develop for treatment of
interior disorders or any other
type of otologic conditions?
Hugo Peris: Yeah, absolutely.
We’re continuing to think about
unmet needs in this in this
patient- patient populations.
And, you know, one source of
inspiration, again, this what’s
been happening in the field for
the last few years, we have the
utmost respect for Frequency
Therapeutics, and Otonomy,
Decibel, and the many other
companies that have been trying
to advance treatments for
hearing. We’re also disappointed
by the fact that some of these
companies are no longer focused
on this effort. And, you know,
we still hope that we’ll be able
to overcome those challenges and
be the ones contributing to
advancing this, this therapy. So
beyond the steroid for Meniere’s
that we’re focused on today,
we’re continuing to build a
pipeline, we are very much
committed to the traditional
approaches to drug in the ear.
So gene therapies for now, an
approach that we are not focused
on at Spiral, we think that
small molecules and small
proteins might actually be good
solutions for in a field that,
like Dr. Limb mentioned, there
are no drugs approved yet. So
we’re we’re committed to
advancing those type of
developments. And we’re looking
at a range of neuroprotective
otoprotective assets that could
help us address different types
of hearing loss from
chemotherapy-induced to age
related noise-induced. So we’re
very much excited about all
these other all these
opportunities, recognizing that,
you know, these are very, not
well defined patient
populations, where there’s still
a lot more work to do in terms
of identifying who are the
patients that have are more more
likely most likely to respond to
this type of treatments. And,
you know, we also believe that
the field has made a lot of
progress over the last few years
in identifying those patient
populations establishing what
are the right outcome measures,
and we’re going to try to learn
upon those things and, and
implement them into our studies
so that we can be more precise
in the development of our
treatments.
Brian Taylor: Yeah, that’s
great. We hope to have you back
sometime in the near future. And
you can talk about some of the
other exciting developments that
you have going on.
Charles Limb: Let me just add
one thing to that, you know,
it’s one thing to not have a
medication, but it’s another
thing to have a medication and
not know how to get it to where
it needs to get. And so there’s
a two fold problem, you know,
it’s not likely that a treatment
for the inner ear is going to be
a pill that you just take. And
it’s just, the odds of that
being the solution here are low.
And so it’s very likely that
we’re going to have to deliver
something to a relatively
inaccessible space. The nice
thing about the platform that
we’re building is that it is
somewhat agnostic to the actual
agent, meaning once we have
refined and perfected the
approach, which is very, already
very functional and usable, you
could basically put anything in,
you can deliver almost any agent
physically to where it needs to
get to. And so we’re excited
about not just our own pipeline,
which is great, and they own
storage formulations of SPT
2101. But the concept that any
agent in the future might
benefit from the work with that
we’re doing you know, this is
when you try to change a field
that doesn’t happen with just
one small team. And this is kind
of a field wide effort. And so I
think we all have to kind of
join forces and hope that our
work can supplement and
synergize with each other.
Brian Taylor: Yeah, that’s
really interesting. And maybe
you could talk a little bit
about this the delivery
mechanism, I guess, I’m curious
to know, like, what have you
learned over the last six or so
years that your company has been
existing in existence about how
the delivery system? What’s
important about that, what have
you learned? What do you know
now today about it that you
didn’t know five years ago? Can
you speak a little bit?
Charles Limb: I can let me get
into it. Without getting into
too many specifics. I want to
just say that something that
might not be clear to
audiologists but it’s very clear
to otologists. Right now, in the
way the way we treat things
intratympanically, there’s a big
assumption, a number of
assumptions that are made, that
the medication is going to get
to where it needs to. But if you
actually break down each of
those assumptions, and then look
at the potential obstacles, what
you learn is there are many
obstacles that are preventing
right now standard intratympanic
therapy from getting into the
cochlea. And so what we have
sort of resorted to is, I mean,
if you’re probably very aware of
this today, we just blindly
stick needles into the eardrum
and hope that somehow the what’s
in the syringe lands in the
cochlea, inside the cochlea,
that’s, that’s not a given, you
know, there’s there’s pseudo
membranes, there’s air bubbles,
there’s redirection, there’s
like clearance down the
Eustachian tube, there’s like
the medication can be nowhere
near the round window, by the
time the patient walks out of
the clinic. And so we need some
certainty, some assurances that
the medicine is first being
placed to where you need it at
the round window, which is the
best apparent entry point into
cochlea. But also Furthermore,
that there’s durability, that
over time, you know, the patient
is not going to swallow their
lunch and then find that the
medication is suddenly gone. Now
that there needs to be some
persistence of this medication
where you want it. And so we’re
working on all of the above
minimally invasively, how to
deliver that to the round window
in a durable way.
Brian Taylor: That’s great. And
my last question, and I think I
already kind of, sort of know
the answer based on our
conversation, and that is, if
you have a crystal ball, and
these treatments are proven to
be successful in your clinical
trials, how do you see them
changing the way that otology is
practiced in the clinic?
Charles Limb: I think otology is
desperate for more solutions,
you know, think about the
patient that comes in with some
central hearing loss that we see
all the time, every week, I see
this in my clinic. And what we
have to offer them is just
really not not very reassuring,
it’s a hope. And what I think
will happen is a new generation
of procedural interventions,
where you’re not just getting a
pill, you’re not or you’re not
going to the OR, there’s
something in between, it’s an
office based procedure that
offers a much higher likelihood
of control. And, you know, some
of the benefits that we’re
hoping for are really based on
advances, advances that were
well established in
ophthalmology, which as a field
are, I would say, is quite ahead
of otology. And much of Spiral’s
roots really are in opthamologic
advances because some of our
scientific founders had
ophthalmology backgrounds, and
they were doing things that
otologists really could could
learn from. And so our hope is
that a lot of the procedural
based things in the clinic that
would help somebody with hearing
loss which don’t exist, will
spawn a kind of new generation
of kind of mid level
interventions that I think would
be very helpful.
Brian Taylor: Right. And you go
any final thoughts before we
wrap things up?
Hugo Peris: Just thank you for
the time. Thank you for the
opportunity to talk about spiral
and explain a little bit about
the work we’ve been doing. We’re
very passionate about the field.
We the thing that there are many
unmet needs. Were excited about
this opportunity to advance the
field to introduce innovations.
And we’re just going to continue
to work hard to bring this drugs
closer to patients.
Brian Taylor: That’s great. Hugo
Peris and Dr. Charles them of
Spiral Therapeutics. Thanks for
your time. We really appreciate
you being with us today. At This
Week in Hearing
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About the Panel
Dr. Charles Limb is the Chief Medical Officer at Spiral Therapeutics. He is the Francis A. Sooy Professor of Otolaryngology – Head and Neck Surgery and the Chief of the Division of Otology, Neurotology and Skull Base Surgery at University of California, San Francisco. He is the Director of the Douglas Grant Cochlear Implant Center at UCSF and he is the Medical Director of Cochlear Implantation at UCSF Benioff Children’s Hospital, Oakland. He also holds a joint appointment in the Department of Neurosurgery.
Dr. Limb received his undergraduate degree at Harvard University and his medical training at Yale University School of Medicine, followed by surgical residency and fellowship in Otolaryngology – Head and Neck Surgery at Johns Hopkins Hospital.
Hugo Peris is the founder and CEO of Spiral Therapeutics. He holds a masters degree in health economics and pharmaco-economics from Spain’s Universitat Pompeu Fabra. Prior to starting Spiral, He spent seven years in Shanghai, working for Luqa Pharmaceuticals.
Brian Taylor, AuD, is the senior director of audiology for Signia. He is also the editor of Audiology Practices, a quarterly journal of the Academy of Doctors of Audiology, editor-at-large for Hearing Health and Technology Matters and adjunct instructor at the University of Wisconsin.