This conference call transcript was computer generated and almost certianly contains errors. This transcript is provided for information purposes only.EarningsCall, LLC makes no representation about the accuracy of the aforementioned transcript, and you are cautioned not to place undue reliance on the information provided by the transcript.
spk07: Good afternoon and welcome to the Voyager Therapeutics second quarter 2024 financial results conference call. At this time, all participants are in listen-only mode. There will be a question and answer session at the end of this call. Please note that today's call is being recorded. A replay of today's call will be available on the investor section of the company website approximately two hours after completion of this call. I would now like to turn the call over to Trista Morrison, Chief Corporate Affairs Officer at Voyager.
spk00: Thank you, and good afternoon. We issued our second quarter 2024 financial results press release this afternoon. The press release and 10Q are available on our website. Joining me on today's call are Dr. Al Sandrock, our Chief Executive Officer, Dr. Toby Ferguson, our Chief Medical Officer, and Dr. Nathan Jorgensen, our Chief Financial Officer. We will also be joined for the Q&A portion of the call by Dr. Todd Carter, our Chief Scientific Officer. Before we get started, I'd like to remind everyone that during this call, Voyager representatives may make forward-looking statements, as noted in slide two of today's deck. These statements are based on our current expectations and beliefs. They are subject to risks and uncertainties, and our actual results may differ materially. I encourage you to consult the risk factors discussed in our SEC filings which are available on our website for additional detail. And now, I will turn the call over to Al.
spk15: Good afternoon, everyone, and thank you for joining us. Please turn to slide three. At Voyager, we are leveraging the power of human genetics to discover and develop transformative medicines that address the root cause of neurological diseases. We have made tremendous progress toward this goal in 2024, including the achievement of several important milestones in the second quarter. In May, we dosed the first healthy volunteers in the Phase Ia Single Ascending Dose Trial of VY7523, formerly called VYTAU01, our anti-TAU antibody designed to inhibit the spread of pathological TAU in Alzheimer's disease. Enrollment in this study is on track, and we expect to report top-line safety and pharmacokinetic data in the first half of next year. Toby will provide additional detail on our Tau-directed programs in just a bit. We continue to advance our robust pipeline of wholly-owned and partnered CNS gene therapy programs, and we continue to expect IND filings for three of these programs next year. In the second quarter, we completed a pre-IND meeting with FDA and initiated GLP toxicology studies for VY9323, our wholly owned SOD1 silencing gene therapy program for SOD1 ALS. Also this quarter, we selected a development candidate in our GBA1 gene therapy program partnered with Neurocrine. triggering a $3 million milestone payment to Voyager. This follows a development candidate selection that occurred in the first quarter on our Neurocrine Partner Gene Therapy Program for Friedreich's ataxia. In June, we appointed Nathan Jorgensen as Chief Financial Officer of Voyager. Nate brings a highly differentiated breadth of experience spanning investment banking, healthcare investing, operational leadership roles in biotech, and a PhD in neuroscience. I'm already seeing the benefits of his strategic financial expertise. Our team presented an impressive body of data at ASGCT 2024 in May, including data on our second-generation tracer capsids, their translatability as evidenced by cross-species and receptor data, and activity against therapeutic targets in Alzheimer's disease and ALS. These posters and presentations are available on our website in case you missed them. Finally, we ended the second quarter with a strong cash position of approximately $371 million, which, based on our current operating plans, we expect to provide runway through multiple clinical data readouts into 2027. The progress we made in the second quarter feeds into our four pillars of value, which are outlined on slide four. First is our pipeline of four wholly owned and 13 partnered programs. As I mentioned, our anti-tau antibody, VY7523, is in a single ascending dose trial, and we have three gene therapies tracking to INDs next year. This sets up for multiple potential data readouts in 2025 and 2026. Second is our industry-leading tracer platform for the discovery of novel AAV capsids to enable CNS gene therapy. As the data we presented ASGCT reinforced, our second-generation capsids have demonstrated robust transduction of key CNS cell types and significant liver detargeting following a single IV dose. These capsids have enabled the selection of multiple development candidates in our wholly owned and partnered gene therapy programs. Third, we have blue chip partnerships with some of the world's experts in neurology and gene therapy, including Neurocrin, Novartis, and Alexion. In total, our partner programs could generate up to $8.2 billion in longer-term milestone payments. Finally, we continue to explore the potential to leverage receptors we have identified to shuttle non-viral genetic medicines into the brain. Ultimately, we aim to expand from gene therapy and antibodies into other modalities of neurogenetic medicine, broadening our impact. With that, I'll turn the call over to Toby. to share his conviction on our tau and gene therapy program.
spk14: Thanks, Al, and good afternoon. Please turn to slide five. This slide summarizes the four wholly-owned programs and 13 partner programs that Al mentioned earlier. We won't discuss all of these programs today, but I do want to spend a few minutes on some of our more advanced programs. Turning to slide six, I want to focus for a moment on our two wholly-owned programs that target tau. There are a few reasons we believe that tau is critically important for the treatment of Alzheimer's disease. First, the presence of tau pathology in the brain is a defining feature of the disease. Second, a wealth of evidence demonstrates that the accumulation and spread of tau pathology through the brain closely correlates with clinical decline in Alzheimer's disease. And third, the spread of tau pathology can be readily visualized in vivo with tau PET imaging. enabling the enrollment of appropriate individuals in clinical studies and providing a quantitative biological readout that is likely to predict clinical outcomes. Importantly, recent third-party clinical data generated using an intrinsically administered tau-directed antisense oligonucleotide showed that reducing tau expression was associated with favorable trends on clinical outcomes. At Voyager, we are advancing two complementary approaches to reduce tau pathology in Alzheimer's disease. VY7523, formerly called VYtau01, is an anti-tau antibody designed to inhibit the cell-to-cell spread of pathological tau in the brain. In contrast to third-party anti-tau antibody approaches that targeted the N-terminus of tau and have been unsuccessful in the clinic, VY7523 targets a C-terminal epitope of pathological tau. in an in vivo model of human tau spread, the murine surrogate of VY7523, inhibited tau spread by approximately 70%, while N-terminally directed antibodies that were ineffective in the clinic were also ineffective in the model. This quarter, we dosed the first participants in the Phase Ia single ascending dose trial of VY7523 in healthy volunteers. This randomized, double-blind, placebo-controlled trial is designed to evaluate the safety and pharmacokinetics of VY7523 in approximately 48 participants across multiple cohorts. Enrollment in this trial is on track, and we expect to report top-line data in the first half of next year. We then plan to conduct a multiple ascending dose study in participants with early Alzheimer's disease. We expect to initiate this trial next year and generate initial TauPET imaging data in the second half of 2026. and has the potential to show slowing of tau spread. Complementing this antibody-based approach, we are also advancing a tau silencing gene therapy program. This program deploys a tau-targeted siRNA packaged in an IV-administered tracer capsid. Using this approach, we've demonstrated robust reductions in human tau mRNA and protein across the brain following a single IV administration in mice expressing human tau. We believe this program has the potential to provide a transformative, single-list treatment for Alzheimer's disease, and we anticipate filing an IND in 2026. Turning to slide seven, in addition to our programs targeting tau, we're also advancing three gene therapy programs for which we expect IND filings next year. They include VY9323, a wholly-owned SOD1 silencing program targeting the genetic cause of SOD1 ALS, the Neurocrine Partnered for Taxon Gene Replacement Program targeting the genetic cause of Friedreich's ataxia, and the Neurocrine Partner GBA Gene Replacement Program for Parkinson's Disease and other GBN1-mediated diseases. As a reminder, we have demonstrated that a single IV administration of VY9323 at a clinically relevant dose of 3E13 vector genomes per kilogram reduced the solid-one mRNA up to 80% in the spinal cord motor neurons in non-human primates. We expect to file an IND for VY9323 in the middle of next year and initiate clinical trial in SOD1 ALS patients after the IND is accepted. Consistent with our strategy to generate rapid proof of biology in our clinical programs, we aim to assess validated biomarkers of target engagement and disease progression in this trial, including measuring levels of SOD1 in the cerebral spinal fluid and levels of neurofilament in the plasma. Importantly, since this program has the potential to generate the first clinical data for gene therapy employing a tracer capsid, we believe it could further de-risk a broader CNS gene therapy pipeline. With that, I'll turn the call over to Nate.
spk01: Thanks, Toby. I just want to say that I'm grateful to be here today and to be a member of the Voyager team. Given my background in neuroscience and my experience on the buy side, the sell side, and as a public company CFO, I am deeply familiar with the tremendous value remaining to be unlocked in treating CNS diseases. as well as the risks. One of the reasons that I joined Voyager was that I appreciated the way the company is working to systematically reduce risk across its pipeline and thereby increase the probability that its potentially transformative programs will succeed in the clinic. On slide eight, I have outlined what I see as four compelling elements of this de-risking strategy. Number one, reducing risk at the target level. by focusing on targets validated by human genetics. Number two, reducing risk at the delivery level by pioneering an industry-leading platform aimed to overcome delivery hurdles posed by the blood-brain barrier. And three, reducing risk at the clinical development level by focusing on disease areas and biomarkers that enable an efficient path to clinical proof of biology and value creation. And one dear to my heart, reducing risk at the financial level by selectively partnering programs to share risk, create near-term value, and reduce internal R&D spend while maintaining substantial upside. Given the high unmet need in the neuro space, and Voyager's unparalleled team of experts in neuroscience drug development, I believe Voyager is uniquely positioned to overcome fundamental challenges in neurology and create tremendous value for both patients and shareholders. I look forward to connecting with many of you at upcoming investor conferences and events, and please do not hesitate to reach out with any questions. With that, I'll pass it back over to Al.
spk15: Thanks, Nate. As you can see on slide nine, Voyager continues to deliver on expectations for 2024. We have advanced our pipeline, our platform, and our partnerships, as well as executed a $100 million public offering and strengthened our leadership team. With a robust slate of clinical milestones expected in the next 12 to 24 months, a maturing partnership portfolio with top-tier collaborators, and cash runway into 2027, we believe Voyager is poised to drive significant value creation over both the near and long term. Finally, I'd like to thank all of our employees for their hard work and dedication to improving the lives of patients. With that, we will open the call for questions. Operator?
spk07: Thank you. At this time, we will conduct the question and answer session. As a reminder, to ask a question, you will need to press star 1 1 on your telephone and wait for your name to be announced. To withdraw your question, please press star 1 1 again.
spk06: Please stand by while we compile the Q&A roster.
spk07: First question comes from Jack Allen with Baird. Go ahead, your line is open.
spk08: Great. Thank you so much for taking the question and for all of the updates. Congratulations on the progress made over the course of the quarter. I apologize as coming in and out as I had actually lost power for where I am here in Ohio, but I wanted to ask about the cadence of the three gene therapy programs that are expected to enter the clinic in 2025. Do you have a sense for which of those programs may be more advanced as compared to others? And then as it relates to the internal SOD1 ALS program, how quickly can we look at impact on biomarkers there? I think it was a matter of weeks or months as it relates to the ASO's impact. I'd love to hear your thoughts as it relates to how quickly we could see early indications of effect from that gene therapy that's internally owned.
spk15: Thanks, Jack. This is Al. I'll start and then I'll ask Toby to answer the second question. So, in terms of the cadence, you know, I mean, the one thing that we are in control of is our wholly owned SOD1 gene therapy program. And, you know, we expect to file an IND roughly in the mid-2025 timeframe. And hopefully, you know, we'll get, we'll get, sail through the FDA process and we can start shortly thereafter in clinical trials. In terms of the other programs, those are partner programs. We know from our partners that they expect to file INDs in 2025 as well. But other than that, I'm not certain I can say more about the cadence. Toby?
spk14: Jack, thanks for the question. I think you've got the idea correct. I think fundamentally the Tafursin program has taught us that you can see, you can observe with effective SOD reduction a change in neurofilament, and also you can measure target engagement by measuring CSF SOD1. To remind, the Biogen program saw about a 40% reduction of CSF SOD1, and that's the first biomarker we would be looking at. We'll also be looking at neurofilament to understand the changes observed there.
spk06: Great. Thank you so much for that response.
spk08: Maybe just, Toby, really briefly, how quickly was that effect on SOD1 and neurofilament light change seen in the Biogen study? I'm trying to get a sense for how quickly we could see early indications of efficacy.
spk14: So fundamentally, remember, Biogen is an intrathecally administered ASO. Those neurofilament changes started to be observed by eight weeks. By 12 to 16 weeks, they had reached their nadir. I think the point to make here is that this is an ASO. We, of course, are administering gene therapy, and so those timelines may be different, and we need to work through that.
spk15: And what about the SOD1?
spk14: An SOD1, I think that can be seen as early as starting to be seen at four weeks, but really 12 weeks is really when you start to see an effect for SOD1.
spk06: Got it. Great. Thank you so much, and congratulations on progress. I'll jump back in the queue.
spk07: One moment for our next question. The next question comes from Divya Rao with TD Cohen. Go ahead. Your line is open.
spk03: Hi, guys. This is Divya on for Phil. I have two questions, one for BY7523. Could you give us an idea of how many dose levels you're exploring? And then based on the preclinical models that you have so far, how many doses do you think you need to step through to hit what would be considered an active dose? And then I have a follow-up question.
spk14: Thank you for the question. This is Toby. Fundamentally, to remind the single ascending doses in healthy volunteers, we're looking at multiple doses. We haven't disclosed the dose, but frankly, we think based on the preclinical models that measure tau spread, We think we understand the exposures we need to get TELSPREAD. And based on the SAD data, we will understand those exposures and move forward with a MAD study next year.
spk06: Todd, do you want to answer the second part?
spk17: So the second part of the question being, what are the doses that we expect to be able to achieve something relative to our preclinical models?
spk04: Yeah.
spk17: What we've done is we're basing it off of the modeling for the PK studies, and we know that we're able to achieve approximately 70% or better knockdown or reduction of taut pathology in the seeding model that Toby referred to. So what we're doing is we're aiming to achieve the level of exposure of our antibody in the brain and the CNS of patients to that level that we needed to achieve that 70% knockdown. So our dosing is based on that correlation, of course. the data that we get from the PK in the studies will really dictate when we achieve that.
spk03: Got it. That's helpful. And then my second question is just, so there's two kind of programs that you're looking at going after tau specifically in patients with Alzheimer's. Should we think of those programs both kind of going after the same population, or do you think that the vectorized, or sorry, the tau silencing gene therapy lends itself to a specific subpopulation? Thank you.
spk14: I think fundamentally I'd say that, one, the Tau antibody program is ahead, and there remains a strong unmet need in patients with Alzheimer's disease. I think we've seen from the beta amyloid data that there continues to be disease progression. I think first and foremost we think Tau is an incredibly important target in and of itself, and we'd be incredibly excited to advance an antibody and an ASO that knocks down all Tau. So I think that's sort of the most straightforward point I would make.
spk15: Yeah, maybe I could add that in the case of the spreading, you know, the antibody is meant to block the spread of pathological tau. So we would want to choose patients where the spread has just started, essentially, and then choose an area of the brain to measure the spread to. And so in the staging, it would be stage two or stage three patients, likely. In the case of the knockdown, we're going to be able to follow what you know we're going to be tracking the viv 80 program right and and that's that's a knockdown approach using an aso so there we're going to learn a lot from that and i suspect we'll we'll model our study after that including the stage of patients thank you one moment for our next question
spk07: Our next question comes from Rye Forseth with Guggenheim Securities. Go ahead, your line is open.
spk16: Hi, this is Rye from Debjit's team. Could you discuss the potential of the tracer platform to yield capsids with multi-organ specificity potentially fit for addressing indications such as DM1, where there's both central and neuromuscular pathology?
spk15: Well, I'll start and finish. Yeah, in some ways it applies not just to DM1, but also free-drug sataxia, which involves the nervous system and the heart. You know, the way we look at it is that tracer finds, looks for variations in the capsid that endow the capsid with an additional tropic activity. So in our hands, since AAV9 works pretty well for cardiac muscle on its own, you don't have to necessarily enhance that. And if the tracer-derived capsid gets the additional property of also getting into the brain, but retains its property of introducing heart muscle, then that would be an ideal capsid. And I bring up the heart, by the way, because VM1 also affects the heart. In terms of skeletal muscle, You know, there, we do look at skeletal muscle transduction, and we will choose capsids that obviously can do that. We haven't said that we have a DM1 program, by the way, but that's why I started with fredrexatexia. But, Todd, did you want to?
spk17: Sure. So, we do look at quite a wide variety of tissues throughout the nonhuman primates. when we're identifying and selecting our capsids. And in fact, for any given disease, we actually build a capsid profile, a target capsid profile. Different diseases, different CNS diseases have different relative delivery needs to even different parts of the brain. We also look for detargeting for off-target tissues like the liver. And so we do evaluate quite a number of tissues. And what we are seeing is that we have different kinds of capsid profiles that are coming out of our capsid screens. So what that results in are different cats and families that have different potentials and opportunities for being deployed for different diseases, and that includes greater or lesser delivery to places like the muscle, the heart, various brain regions, and then, of course, those off-targets. So I think the answer is we do see the opportunity for tracer to deliver opportunities for not just the CNS, but in other diseases as well.
spk06: Thank you. One moment for our next question. Next question comes from David with Citigroup. Go ahead.
spk07: Your line is open.
spk10: Yeah. Hi. This is Sean on this team from Citi. Thank you for taking our questions. I guess one question that we have is, can you speak to the potential competitive position of your antithelial therapies versus Biogen's program? And second, question relates to the SOD1 therapy. I'm just curious, what are some of the remaining gating factors to get to the IID filing? Thank you.
spk15: Well, I'll answer the first question on tau, and then maybe Toby could answer the second question on SOD1. So, you know, in terms of Biogen, you know, they have a BID-80 program. They did have an anti- tau program directed against the N-terminal, as Toby mentioned, that antibody was terminated after not producing the results that were acceptable. And so there are, however, a number of other companies pursuing anti-tau antibodies, at least four other companies that we know of targeting various different epitopes. None are, again, directed against the N-terminal. probably because everybody thinks that the N-terminal is not a great epitope, but some are targeting the mid-domain, some are targeting the MTBR, and like us, one of the companies targeting the C-terminal. Fundamentally, the vectorized siRNA approach is, you know, as Toby indicated, we're not in the clinic yet. We do expect to file an IND in 2026. But, you know, so we're way behind, if you will, the BIB 80 program, which is already in the clinic and starting to produce some interesting results. I would just add that in concept, it's very similar in the sense that it's knocking down the expression of all forms of tau, both intracellular and extracellular. So it's decreasing expression of tau essentially in the nervous system. So in that sense, it produces, we think, a relatively equivalent effect on tau. Toby, do you want to take the second question?
spk14: Sure. Maybe I'd add one other point of emphasis on the tau program before I do. Just to highlight that the BIDR program, of course, is intrathecally administered, and our program is a one-time IV-administrated program, sort of in keeping with our strategy of pursuing with our novel tracer capsids, relatively de-risked targets. On the SOD program, I think fundamentally what we've highlighted is that that program, we closed that program as we started the toxicology programs, and that's the main key next step for moving the program forward for the IND.
spk05: Thank you.
spk06: Stand by for our next question. The next question comes from Jay Olson with Oppenheimer.
spk07: Go ahead, your line is open.
spk11: Oh, hey, this is Cheung on the line for Jay. Thanks for taking the question and congrats on the progress. Maybe like a two-part or two questions from us. First, we're just wondering if there's like a mechanism, rationale to support behind the liver detargeting of the trees or capsids and if there's way to further enhance the liver detargeting. And secondly, I'm just wondering for the ALPL binding ligand for new modalities, curious about any particular modality you are thinking right now to prioritize. Thank you so much.
spk15: So I'll ask Todd to answer the first question, and I'll take the second one.
spk17: Sure. So the first question was effectively mechanistically, why are capsids detargeted from the liver? I can answer that in two parts. One, this is something that we're seeing with a variety of our different capsid families and others have reported this too for capsids that cross the blood-brain barrier. It's an empirical observation that many of these capsids deliver to the liver less than they deliver elsewhere or less than the parental capsids do for those that don't deliver across the blood-brain barrier. As to the reasons why, we can speculate. Some of it is we know that subtle changes that affect the charge of the capsid can impact things like liver delivery. The other is, again, with relating to the empirical observations is that we are choosing to move forward those capsids that are already targeted from the liver. This is part of our selection criteria and something that we're specifically looking for to reduce the potential for any off-target problems. So,
spk15: And just a quick answer to the second question on ALPL. So you're correct. We are interested in using ALPL binding ligands and conjugating various macromolecules to them to see if we can get them across the BBB. And, you know, we're testing proteins such as therapeutic antibodies and enzymes. We're also going to be looking at whether or not they can transport oligonucleotides, both ASOs and siRNAs. And yeah, we're doing those experiments now.
spk06: Thank you. One moment for our next question.
spk07: The next question comes from Yun Li with Truist. Go ahead. Your line is open.
spk13: Hi, good afternoon. This is Median for June, Congress on the Progress, and thanks for taking our question. So maybe a big picture question for us. Given time to data, especially in relation to tracer platform, and also recent advances in the field, basically on decorated AAVs, how do you see the future of CNS-targeted AAVs in the next 12 to 18 months, and also how you plan to ensure your leadership position in this space. Thank you.
spk15: Well, thank you. That's an interesting question. And, you know, look, we have to be aware of the fact that there are multiple other companies pursuing the approach that, you know, that I believe the Voyager scientists pioneered, and not just modifying the AAB, but as you just pointed out, decorating, if you will, with, for example, TFR binding motifs. And so those are all viable approaches potentially, but we don't know until we do the experiments in humans which ones will work. I would say that in the future, what we're going to see is, for example, the earlier question, what other tissues can you target besides the brain? because several diseases involve more than just the CNS. Second is cell type tropism. So it's not just the tissue. We want to target certain cells. And sometimes it's neurons. Sometimes it's glial cells. Sometimes it's oligodendrocytes. Sometimes it's a combination of those cell types. And then there's the detargeting, not only the liver, but also other potential cells of toxicity, such as dorsal root ganglia neurons. So, when you add all that together, I think there's going to be a need for multiple capsids that are going to be required for certain diseases. And that's why, as Todd said earlier, we develop capsid profiles for each of the diseases we're considering. And we have a pretty high bar. Finally, I'd also say that there's other issues that we should remember. Manufacturability, for example. And that's built into our development candidate criteria. There's immunogenicity. And there are potentially ways of affecting immunogenicity by making variations in the capsid. And so I think there's still a lot of innovation to be had. But I also want to emphasize the fact that we may want to tailor the capsids to the disease that we need to treat and the cells in which that we need to get the transduction to occur in.
spk06: Thank you. One moment for our next question.
spk07: The next question comes from the line of Samant Kulkarni with Conocord Genuity. Please go ahead. Your line is open.
spk02: Good afternoon. Thanks for taking our question. So on your anti-tau programs, conceptually, what are the pros and cons of targeting extracellular versus intracellular tau? And with your gene therapy program, are you aware of any downsides of potentially one-and-done tau silencing approaches, given the role of tau in microtubule stabilization?
spk15: Well, maybe I'll start, and then I'll ask my colleagues, either Todd or Toby, to add. You know, I would say that targeting extracellular tau is likely to be safer, as you're kind of implying in your question, because you're not affecting all forms of tau, and you're not affecting the intracellular tau in particular. But on the other hand, there are questions about efficacy, particularly given, as what Toby said, the N-terminal antibodies have failed. And so there's that. And then in terms of the knockdown, We don't know, you know, first of all, cow knockout animals are actually pretty, you know, they're viable. They actually can reproduce. And so even though we think that there is a role for cow during development, certainly, it doesn't seem to be, there seems to be some tolerance for the loss of cow. I'd say the other thing is that we're fortunate in the sense that BID 80 is going to enroll hundreds of patients into a well-controlled study. And we will have some idea of the safety actually over the long term because those studies were started a couple of years ago. So we should have long-term data on the safety of knocking down the expression of tau by the time we enter the clinic and start our journey ourselves. And then also in terms of the magnitude of knockdown too. I mean, well, we'll have some idea perhaps by then, is what is safe and what's not. Toby?
spk14: Well, I don't have much to add. I mean, I just think that the human data, in particular, the experience of the baby, some of the genetic data, really suggest that, at least as we understand so far, that knockdown of tau has been well-tolerated. Of course, we'll need to see the longer-term data. And I think it's sort of the idea that you, with knockdown, supersede all forms of tau and really address tau and its totality is quite important. And for the antibody program, really we have targeted the pathologic form of tau, and based on our spreading model, we think that is a very reasonable thing to do given the knockdown we've seen. And so I think that's important. We think they could be essentially complementary to each other.
spk17: I'll add just a little bit. Although I think that the human BID-80 data will ultimately supersede anything preclinical, I will add that preclinical studies to date, in addition to what Al described with the cow knockout animals, has all looked remarkably benign. And so people have looked in non-human primates as well as rodent species. We've done this internally in our mouse studies that we've talked about at conferences. Other people have reported on this. And so far, reduction of cow using gene therapy or gene therapy-like approaches has seen quite remarkably benign. So you never know until you do the ultimate human experiment. But to date, things look pretty positive with regard to knockdown risk.
spk06: Thanks. One moment, please.
spk07: The next question comes from Yanan Hu with Wells Fargo Securities. Go ahead. Your line is open.
spk09: Hi. Thanks for taking our question. This is Quan Ang for Yanan. So I have a quick question on the siRNA program, tau siRNA. So when may we see the NHP data? And you previously mentioned that there is a potential for combo strategy with the antibody. So any updated thoughts on that? And would you seek the approval of antibody first, or would you synchronize the programs? Thank you.
spk15: I'll ask Todd to answer the first part of the question and Toby to answer the second part.
spk17: For the first part of the question, we have ongoing experiments to drive toward development candidate identification. We've given no guidance on when we expect to have those data. The guidance that we've given is that IND in 2026.
spk14: On the second part of the question, what I would say, you asked a question about synchronizing programs. I think fundamentally what's most important in the context that there remains strong in that need for people with Alzheimer's disease. And so we certainly, if we had positive data for our tau antibody program, which of course is in the lead, we would move forward with that program.
spk09: Got it. Thank you for that. And a quick follow-up. So it's a hypothetical question for the antibody. So if you are able to stop all the spread of tau between cells, Would that be enough to save the early stage patients such as BRAC stage 2 patients? Thank you.
spk06: I think fundamentally it's a very reasonable question.
spk14: I think we would, of course, be elated if we saw that. I think what we understand from the spread of tau based on tau path and tau pathology is that is the intent of this program.
spk06: We'll have to figure it out in the clinic. Yeah. Thank you for all the comments. One moment, please. The next question comes from Laura Chico with Wedbush Securities.
spk07: Go ahead, Laura. Your line is open.
spk12: Thanks very much, and thanks for taking the question. Good afternoon. I wanted to ask on two questions related to the GBA1 and the frigid cetaxia programs, just to mix it up a little bit here. Wondering if you could talk a little about the type of patients that you'll be seeking to identify, and essentially, There have been a few other gene therapy efforts kind of ongoing in these spaces, but wondering how you think about what's the appropriate window for therapeutic intervention. Any color there? And then just one quick follow-up. Can you remind us about any potential remaining milestones that we should have on our radar for 24? Thank you.
spk14: So I think for the pre-vaccination programs online, these are partner programs with Neuroquin, and they own the development of that program. I think if you look to the other programs that have gotten approval, such as Stuclaris, they've looked at broad populations, both adult and some younger age patients. So fundamentally, there is a path there that's been paved, but this really sits with NERC.
spk06: And then the milestones, I think we just don't comment on milestones.
spk15: I would just say also add that on FA, you know, it's great that the first drug ever for FA was approved. The mechanism of action, it's an NRF2 activator. I think it's going to be, I think our drug would only add to the efficacy. And so, because they're completely different mechanisms of action versus replacing for taxon. So, I'll just say that. And then ask you to, Laura, to ask Neurocrine some more specific questions.
spk06: Okay. Thank you, guys. I appreciate it. You're welcome.
spk07: Ladies and gentlemen, this concludes today's presentation. Thank you once again for your participation. You may now disconnect.
Disclaimer