Good day, ladies and gentlemen, and welcome to the Altimmune, Inc. full year and fourth quarter 2022 financial results conference call. At this time, all participants are in a listen-only mode. Later, we will conduct a question and answer session and instructions will follow at that time. To ask a question during the session, you will need to press *11 on your telephone. As a reminder, this call is being recorded. I would now like to introduce your host for today's conference call, Richard Eisenstadt, Chief Financial Officer of Altimmune. Rich, you may begin.
Thank you, Gigi. Good morning, everyone. Thank you for participating in Altimmune's full year and fourth quarter 2022 financial results and business update conference call. Members of the Altimmune team joining me on the call today are Vipin Garg, our Chief Executive Officer, Scot Roberts, our Chief Scientific Officer, and Scott Harris, our Chief Medical Officer. Following the prepared remarks, we will hold a question and answer session. A press release with our full year and fourth quarter 2022 financial results was issued this morning and can be found on the investor relations section of the company's website. Before we begin, I would like to remind everyone that remarks about future expectations, plans and prospects constitute forward-looking statements for purposes of safe harbor provisions under the Private Securities Litigation Reform Act of 1995.
Altimmune cautions that these forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those indicated. For discussion of some of the risks and factors that could affect the company's future results and operations, please see the risk factors and other cautionary statements contained in the company's filings with the SEC. I would also direct you to read the forward-looking statement disclaimer in our press release issued this morning and now available on our website. Any statements made on this conference call speak only as of today's date, Tuesday, February twenty-eighth, two thousand twenty-three. The company does not undertake any obligation to update any of these forward-looking statements to reflect events or circumstances that occur on or after today's date. As a reminder, this conference call is being recorded and will be available for audio replay on Altimmune's website.
With that, I will now turn the call over to Dr. Vipin Garg, Chief Executive Officer of Altimmune.
Thank you, Rich, and good morning, everyone. We appreciate you joining us today for a discussion of our year-end and fourth quarter 2022 financial results and business update. We are excited about the 2022 achievements with pemvidutide, our GLP-1 glucagon dual receptor agonist. Pemvidutide is in development for the treatment of obesity and NASH, two important clinical indications. Altimmune achieved key milestones in the development of pemvidutide last year, including completion of our 24-week phase 1b NAFLD trial with compelling positive data and the initiation of our 48-week phase 2 MOMENTUM obesity trial.
The 24-week data from the NAFLD trial produced a greater than 75% relative liver fat reduction at 24 weeks, with over 50% of subjects achieving normalization of liver fat and significant reductions in serum ALT levels and correlated CT1 relaxation times in the 1.8 milligram dose group. Serum ALT levels and CT1 imaging are both established markers of liver inflammation. Subjects receiving pemvidutide also had a mean weight loss of 7.2%, a placebo-adjusted weight loss of 6% in subjects without diabetes at this dose. This is important because excess body weight is believed to be a major driver of NASH and its comorbidities, and weight loss represents an important therapeutic goal in the treatment of these patients.
We believe the robust reduction in liver fat content and markers of liver inflammation, together with meaningful weight loss, will be important determinants of success in NASH. Because the great majority of people with NASH also have overweight or obesity, we believe pemvidutide is uniquely positioned to address these populations effectively. Given these results, we plan to continue development of pemvidutide for NASH and expect to initiate a phase 2b NASH trial in mid 2023. Scott Harris will provide more details on this trial shortly. Turning to our Phase 2 MOMENTUM obesity trial, we are looking forward to announcing the top line 24-week interim results of approximately 160 subjects in the second half of March.
We believe that the level of weight loss consistent with the class-leading obesity drugs may be achieved at the end of 48 weeks of treatment, and that potential will be reflected in the interim data readout. We also believe that tolerability profile of pemvidutide, together with the absence of dose titration, could translate into improved adherence to therapy and ease of administration, and that a reduction in serum and hepatic lipids and blood pressure may afford benefits to patients at risk of cardiovascular events. In contrast to several other agents in development, reductions in blood pressure are being achieved with pemvidutide with minimal increase in heart rate.
We believe these attributes could differentiate pemvidutide from other drugs in the obesity space and make an important contribution in the treatment of obesity. Finally, enrollment in the Phase 2 clinical trial of HepTcell in chronic hepatitis B is over 90% complete, and we expect to have a data readout in the first half of 2024. Recall that this trial is designed to show evidence of antiviral effects against hepatitis B virus and establish its potential role in combination therapy for the treatment of this important disease. We're excited about the progress of pemvidutide and HepTcell and the upcoming results of these ongoing trials. With that, I'll now turn the call over to our Chief Medical Officer, Dr. Scott Harris, to discuss our data and clinical plans. Scott?
Thank you, Vipin, and good morning, everyone. First, let me briefly review the results of our Phase 1b NAFLD trial. As Vipin noted, a 75% relative liver fat reduction was achieved in the 1.8 milligram dose at 24 weeks of therapy, with over 50% of subjects achieving normalization of liver fat. These effects on liver fat content were accompanied by significant reductions in corrected T1 and serum alanine aminotransferase, both markers of hepatic inflammation. CT1 is a measure of fibroinflammatory activity in the liver, and elevated CT1 scores have been correlated with hepatic and cardiovascular events in clinical trials. Specifically, an 80-millisecond reduction has been shown to correlate with a 2-point improvement in NAFLD activity score on liver biopsies, and up to 100% of subjects assessed by CT1 experienced an 80 millisecond or greater change in CT1.
We believe these findings could be predictive of success in liver on biopsy endpoints when late-stage trials are completed, as well as the likelihood of reduced hepatic and cardiovascular events when outcomes trials are conducted. Next, let me tell you about the initiation of a Phase 2b NASH trial later this year. This Phase 2b biopsy-driven NASH trial will be conducted at approximately 60 sites in the U.S. with Dr. Stephen Harrison, Medical Director, Pinnacle Clinical Research, an Adjunct Professor of Medicine, University of Oxford, who led our 12-week NAFLD V trial and 12-week extension trial, serving as the principal investigator. The key endpoints of this trial will be NASH resolution and fibrosis improvement after 24 weeks of treatment. We also plan to perform correlations with non-invasive tests of NASH resolution and fibrosis improvement and have discussions with FDA about the use of these biomarkers as primary endpoints in Phase 3.
We expect the study to commence mid-2023 and produce top-line results in the first half of 2025. Let me talk about the Phase 2b MOMENTUM trial of pemvidutide in obesity. The trial was designed to enroll approximately 320 subjects without diabetes, but with obesity or overweight, with at least one comorbidity. Subjects were randomized 1 to 1 to 1 to 1 to 1.2 milligram, 1.8 milligrams, 2.4 milligrams of pemvidutide or placebo administered weekly for 48 weeks in conjunction with diet and exercise. Baseline characteristics of the fully enrolled study population include median body weight and body mass index of approximately 101 kilograms and 36 kilograms per meter squared, respectively, and median liver fat content of approximately 5% as measured in approximately 100 subjects participating in a body composition substudy.
The study population is approximately 75% female, and approximately 20% of the subjects are of Hispanic ethnicity. As we pointed out previously, the demographics of the subjects in the interim analysis may differ from those in the fully enrolled study population. In addition, unlike the Phase 1b NAFLD trial, the Phase 2b MOMENTUM trial employs endpoints and lifestyle modifications that are standard for multi-center obesity trials. The primary endpoint of the MOMENTUM trial is the relative % change in body weight at 48 weeks compared to baseline, with additional readouts including serum lipid profiles, cardiovascular measures, and glucose homeostasis. Dr. Louis Aronne from Weill Cornell Medical College, a leading authority in obesity and obesity clinical trials, is serving as the principal investigator. We expect to have the results of an interim analysis of the MOMENTUM trial in the second half of March.
That analysis will be comprised of approximately 160 subjects that received 24 weeks of therapy. The readout parameters are expected to include weight loss, serum lipids, adverse events, vital signs, glucose control, and study discontinuations. We have also completed enrollment in our Phase 1 multi-center safety trial, evaluating glucose control in subjects with type 2 diabetes over 12 weeks of treatment. Approximately 48 subjects were planned with a readout expected in March 2023. The purpose of this trial is to establish the safety of pemvidutide in preparation for our end of phase 2 meeting with the FDA, which is expected early next year.
Across the trials I have described, we are rapidly building the safety profile of pemvidutide with unblinded safety data accrued in over 200 subjects receiving pemvidutide in clinical trials at year end 2022 and approximately 500 subjects by year end 2023. We are also making excellent progress in our enrollment of our phase 2 multicenter clinical trial of HepTcell. The trial was designed to enroll approximately 80 subjects with over 90% now enrolled. We expect to read out the results of this trial in the first half of 2024 once all subjects complete the 6-month treatment period.
Recall that HepTcell is an immunotherapeutic against hepatitis B virus and that the virologic effects of HepTcell are being evaluated in chronically infected patients with partial control over infection to enable the combination of HepTcell with novel direct-acting antivirals as part of chronic therapy for chronic hepatitis B. It is believed that effective treatment of chronic hepatitis B will include combination therapy of a direct-acting antiviral and an immunotherapeutic agent. I will now hand the call over to Rich Eisenstadt to give an update on our third quarter financial results. Rich?
Thank you, Scott, and good morning again. For today's call, I'll be providing a brief update on Altimmune's full year and fourth quarter 2022 financial and operating results. More comprehensive information will be available in our Form 10-K to be filed with the SEC later today. Altimmune ended the fourth quarter of 2022 with approximately $184.9 million of cash equivalents and short-term investments, compared to $190.3 million at the end of 2021. Turning to the income statement, revenue was negligible in the fourth quarter of 2022 compared to $3.3 million in the same period in 2021. The negligible negative revenue reported in 2022 was due to adjustments to cost reimbursement under the now completed BARDA contract.
Fourth quarter 2021 revenue was primarily prior period rate adjustments received in that quarter for earlier government-funded research projects. Revenue for the full year 2022 was negligible compared to $4.4 million in 2021. The revenue in 2021 was attributable to the BARDA contract and T-COVID programs, which were concluded in 2021. Research and development expenses were $19.2 million in the fourth quarter of 2022, compared to $20.2 million in the same period in 2021. Approximately $15.3 million of this total for the fourth quarter of 2022 were direct expenses for the conduct of our clinical programs, including $13.4 million in direct costs related to development activities for pemvidutide and $1.9 million in direct costs related to development activities for HepTcell.
R&D expense in the fourth quarter of 2021 included $12.4 million in direct expenses associated with the development of pemvidutide and $2.4 million in direct expenses related to HepTcell development activities, as well as approximately $2.6 million in expense to close out the AdCOVID campaign. Research and development expenses were $70.5 million in full year 2022 compared to $74.5 million in the prior year. The decrease in R&D expense was primarily the result of a $35.1 million decrease in AdCOVID and T-COVID related development costs, which programs were discontinued in 2021. This included the expensing of payments made to Lonza for the construction of a manufacturing suite.
In full year 2022, we incurred $46.8 million in direct costs associated with the NAFLD and MOMENTUM trials for pemvidutide, and $7.5 million in direct costs associated with the HepTcell campaign. General and administrative expense were consistent period over period at $3.8 million in each of the fourth quarters of 2022 and 2021. For the full year 2022, general and administrative expense were $17.1 million versus $15.4 million for full year 2021. The $1.7 million increase was primarily due to increased stock compensation expense as well as additional labor related costs in 2022.
Net loss for the three months ended December 31, 2022 was $21.7 million or $0.43 net loss per share, compared to net loss of $23.9 million or $0.57 net loss per share for the fourth quarter of 2021. The reduction in net loss is primarily attributable to the $1 million lower research and development expenses, $3.3 million in non-recurring expense in 2021 for the recognition of the Lonza impairment loss, and a $1.3 million increase in interest income, offset by the reduction in contract revenue.
Net loss for the year ended December 31, 2022 was $84.7 million or $1.81 net loss per share, compared to $97.1 million or $2.35 net loss per share for the year ended December 31, 2021. The decrease in net loss is primarily attributable to the lower research and development expenses in 2022, $11.4 million in non-recurring expense in 2021 for the recognition of the Lonza impairment loss, and the $2.7 million increase in interest income offset by the reduction in contract revenue.
We currently estimate that our research and development expenses for full year 2023 will be approximately $90 million. G&A expenses for the full year 2023 are anticipated to be approximately $18 million. Approximately $10.1 million of these operating costs are for non-cash expenses, including stock compensation and depreciation and amortization. We estimate that our existing cash funds us into the second half of 2024, which includes completion of the 48-week MOMENTUM trial and completion of enrollment of the phase 2b biopsy NASH trial. Our current cash projection also anticipates investment in 2023 in phase 3 obesity clinical drug supply, as well as funding in 2024 for the initiation of a phase 3 obesity campaign. I will now turn the call back over to Vipin for his closing remarks. Vipin?
Thank you, Rich. Operator, that concludes our formal remarks, and we would like to open the lines, to take questions. Could you please instruct the audience on the Q&A procedure?
As a reminder, to ask a question, please press *11 on your telephone and wait for your name to be announced. To withdraw your question, please press *11 again. Please stand by while we compile the Q&A roster. Our first question comes to the line of Seamus Fernandez from Guggenheim Securities.
Great. Thanks so much for the question. Two questions for the team here. First and foremost, if you could lay out what you would hope to see in the MOMENTUM study just from a weight loss perspective that would be, you know, from your perspective, clinically relevant and likely successful as an obesity agent, at 24 weeks, perhaps even generating strategic interest, or potential partnership opportunities. Would love to just hear how the team is thinking about those levels and thresholds, and perhaps, you know, comparable products, that, you know, make sense in that regard.
Second, as it relates to the NASH study, can you just help us better understand how the recruitment in biopsy-driven studies, at least has been progressing or perhaps just a general sense of when your 24-week data could potentially be available? I know it's a little bit of a crystal ball looking into the future in that regard, but just interested to better understand that. Thanks.
Yeah, thanks for the question, Seamus. Good morning. Well, let me take the first question and maybe Scott Harris can take the second one and anybody else can chime in as well. So as far as what we are looking to or expecting to see at the 24-week interim readout, as we have always said, that this is not about just one thing, not just about just one number. It's not just the weight loss number. You have to look at the overall target product profile, to figure out where does your product will fit in the long run in the obesity landscape. So if you think about it, at 48-week or at the end of treatment, approximately a year, what we are looking to achieve is about 15%-20% weight loss.
We think that's where one needs to be in order to be competitive from a weight loss perspective. You also need to bring a number of other attributes which we think our product has. I think it's really a combination of all those things, lack of dose titration, better tolerability, serum lipid reduction in serum lipids, and so on. All of that has to be sort of factored into determining the overall competitive profile of the product. If you back off of that and look at 24 weeks, we would expect to be on way to achieving that 15%-20% weight loss. 24 weeks, you know, halfway there, you know, 8%-10% is what we've been talking about.
We think we'll have a competitive profile if we're having that kind of weight loss with all of these other attributes together with that weight loss. Scott?
Hi, good morning, Seamus. Regarding your second question, we think that we're putting together a very strong plan for recruitment. We think, we've identified a number of very good sites. As you know, Stephen Harrison is serving as the principal investigator of the trial once again. He's a great organizer, and there's a very established network under his direction. We feel very good about the recruitment plan and doing it in the United States. Regarding that, we think that we could have a readout on that 24-week endpoint in the first half of 2025.
Great. Thanks. Very helpful. Just as a final follow-up question, and I'll jump back in the queue. you know, as we think about the prospects for 8% to 10% weight loss, you know, I assume just to clarify, is that placebo-subtracted weight loss that you're hoping to see? Maybe just as a little bit of incremental context, can you remind us at 24 weeks what Wegovy and tirzepatide achieved? Thanks.
Hey, Seamus. Yes, as we've said before, that 8%-10% is placebo-adjusted. You know, as Vipin mentioned, at the end of the year, we'd like to be in that 15%-20% range, and where we would be at the end of 24 weeks is how you look at the curve. We should point out that at the same time point, the 24 weeks semaglutide, which has been a very successful drug, I think there were over 60,000 scripts written last week alone, was at 8% placebo-adjusted weight loss. Tirzepatide was at 12%. The 8%-10% is certainly within that range, and it's actually in excess of semaglutide. We think that, you know, based on our phase 1 data, we can have very, very good weight loss.
We've constructed our target product profile to include not just a weight loss % number, but the full spectrum of what's going to differentiate drugs and get doctors to use them. The benefits of the drug are going to be well beyond the simple weight loss number. It's going to include all the other attributes that Vipin talked about.
Yeah. I would also point out that when we are comparing 15%-20%, we're looking at 68-72 weeks for semaglutide and for tirzepatide versus, you know, what we are looking at here is a 48-week study. There's still a lot of runway left there to achieve additional weight loss beyond 48 weeks.
Thank you.
Thank you. One moment for our next question. Our next question comes from the line of Yasmeen Rahimi from Piper Sandler.
Good morning, team, thank you so much for all the updates and details. Two questions for you. I just wanted to drill down in the design of the NASH study. What is the duration of the study? I just wanted to also clarify, is the study powered for both endpoints, NASH evolution as well as a one-point improvement of fibrosis? Then, broadly speaking, what is the size of the study going to be? If you could just drill down there. Then, one... Sorry, one last question about the diabetes study. A lot of clients are wondering, and given that that study is also reading out at March around the same time as we're expecting interim MOMENTUM, how do you plan on sharing that data?
Thank you again for taking my long list of questions.
Yeah, I mean, let me take the second question, and then Scott, maybe you can take the first one. As far as the diabetes study is concerned, I mean, both the studies are neck and neck. We're prioritizing the MOMENTUM study to make sure that that data is out as quickly as possible in the second half of March. We're also expecting the diabetes data around the same time. It's hard to say exactly what the timing will play out, but I would say it's going to be very close to each other.
Yeah. Yas, thanks for the question about the next study. That study is still in its final stages of design. We're going to share those additional details as soon as we can. At this point in time, we do believe that we're going to be reading out at 24 weeks. We consider both endpoints important. The actual power calculation will need to be worked out, but the hope would be that we could power for both. Again, that's going to depend on the sample size, and that hasn't been finalized at this point either. We do hope to get you those details as soon as possible.
Thank you, Scot. Just a clarification question. Given that you hope to have the data, I guess in the first half of 2025, can we assume that the study will be a 1-year duration or, rather than 6 months or a little premature to make these wrong assumptions on our end?
Well, the primary endpoint of the study will be read out at 24 weeks or 6 months, and we're making a decision about whether to continue to follow a patient for other parameters such as safety or the non-invasive markers for a longer period of time. That decision is being made right now. Assuming we get the trial, commenced mid the year this year and the time period that we anticipate will be necessary to accrue the requisite number of patients and then the 24 weeks of treatment follow-up, we think that a first half 2025 data readout is very realistic.
Great. Thank you so much and really the best of luck as we're headed in the next few weeks. Thank you again.
Thank you. One moment for our next question. Our next question comes from the line of Roger Song from Jefferies.
Great. Thank you, team, for taking our question. Quick ones from us. One is, you know, given the pleiotropic effects from the pemvidutide, can you guys just lay out what are the key targeted population you wanna address, particularly, for example, for the obesity plus minus, NAFL versus NASH, maybe some other comorbidity, pemvidutide, the, you know, better or worse position to address? If you can give us some details in terms of the numbers, that'll be very helpful. I'll have a follow-up question after that. Thank you.
Hey, Roger, good morning. There is a great deal of overlap between the obesity population and the NASH population. It's estimated that 50% of obese patients have NAFLD, virtually all NASH patients, at least in the United States, have obesity. It's known that they share similar comorbidities. NASH patients at their terminal stages of liver disease die of liver disease, they predominantly die of the cardiovascular complications. Therefore, it's important when you treat the NASH patient to treat not only the process going on in the liver, also the obesity as well to have a meaningful impact. We also think that doctors, when they prescribe to patients, will pick drugs for the treatment of NASH that also offer weight loss, not only because they believe it so, because patients also want it.
I point out that in the NASH space, we believe that we're the only drug that have effective interventions on both NASH inflammatory and fibrotic activity at the end of the trial, but also weight loss. When you're looking at the obesity population, clearly right now in its early stages of the marketplace and development, people are looking at 1 thing. They're looking at the % weight loss. That would be nice if insurance companies were looking at that as well. We know that the primary dose of tirzepatide that's being prescribed right now is not the 15 milligram dose, but the five milligram dose. Gives you an idea of the kind of weight loss that prescribers and patients might want right now.
Despite the fact that tirzepatide had a higher % weight loss than semaglutide in clinical trials, that semaglutide is being prescribed quite nicely. Our projection for the % of weight loss is actually greater than semaglutide at 24 weeks. We think in terms of the target product profile, what will it include? It will include meaningful weight loss. Meaning, as Vipin pointed out, in that 15%-20% range, although at the end of 48 weeks. Although we think that based on our phase 1 study results, we can achieve more than that. We believe a successful target product profile would include that as a base case.
We think it's important that it also be replete with the treatment of the comorbidities that are ultimately gonna drive prescriptions and insurance approvals, such as reduction in serum lipids, reduction in hepatic fat, meaningful reductions in blood pressure, which we're achieving unlike some other compounds in development, with only minimal increases in heart rate.
You know, Roger, in that context, it's helpful to also understand that the NIH states that 60%-70% of obese people are dyslipidemic. You know, the ability of glucagon to drastically change the metabolism of lipids and lower serum lipids and liver fat, as Scott just indicated, certainly creates a, you know, a special target population in that respect.
Excellent. Thank you. I appreciate all the comments. Very good. Very quick one in terms of the NASH. I know it's early stage, you're still finalizing the design, but just in terms of given the multitude, the effect from pemvidutide, what could be the ideal population you will do, like a earlier stage in terms of the NASH stage or some other consideration you will have for the patient population? Thank you.
Thanks for the question, Roger. It had been said early on in NASH development that metabolic drugs treat at the early stages of NASH, whereas you needed anti-fibrotic drugs to treat the later stages. That paradigm has been turned on its end because we now have two metabolically active drugs, resmetirom and efruxifermin, which have completed phase 3 and phase 2 respectively, having very meaningful effects on fibrosis. What that shows is that if you affect the liver and have effective liver fat reduction, you're gonna have effective reduction in inflammatory and fibrotic activity, which is gonna drive activity not only from fat reduction all the way through fibrosis improvement. We actually see the product population for the study being all stages of NASH up until advanced fibrosis. That's been a tough population to treat.
We point out that the greater the reduction in the liver fat, the greater the effects that I just mentioned have been in clinical trials. Very happy about the resmetirom results. The reduction of liver fat at 24 weeks was about 49%-50%. With efruxifermin, it was about 65%-70%. We're at 70%-75%. Based on that, we're very, very optimistic about biopsy results in the future. With resmetirom, which we believe will go on to approval, only 25% of people had a response in either NASH resolution or fibrosis improvement. We think that's great. It lays the regulatory precedent, but we also believe there's a large amount of room for improvement that we think we can fill.
Excellent. Thank you. That's all for now.
Thank you. One moment for our next question. Our next question comes from the line of Corinne Jenkins from Goldman Sachs.
Thanks, good morning. Maybe first for me, just based on what we saw in the NAFL study, how do you think the dose titration in the 2.4 mg/kg arm could impact safety compliance? Maybe downstream about efficacy in the upcoming MOMENTUM readout.
Well, thank you for the question, Corinne. We put that Short titration in place based on some observation we made in our first in-human study. With the 2.4 milligram dose, we saw more GI intolerability events, and they were occurring early on, in the first 1 to 2 weeks. We thought that a 4-week titration would mitigate adverse events, and we saw something to that effect in our NAFLD trial. Whether we continue to use that titration going forward in the future, we'll have to see based on the data that we accrue.
We think that at the end of 24 weeks with a 4-week titration, it would probably, at that point in time, have a minimal effect on the overall weight loss, and certainly by 48 weeks, there'd be sufficient kind, time to minimize the impact of the effect of the titration. We're not committed, by the way, to using titration going forward. You know, we'll look at the data, we may drop it. We point out that we're the only drug in development, for either obesity or NASH that's incretin based that can actually dose without dose titration. We have the optionality if we want, and this is not something we're doing right now, but something that we're quite aware of.
If we ever got back research, for example, market research, which we're conducting continuously, that patients preferred the tolerability over the titration, we could offer titration as an adjunct, either in a late-stage trial or as a separate user trial, and actually offer that to patients and doctors as a prescribing option. That's something that the other drugs in development like tirzepatide and semaglutide can't do because they're already added 4-5 months of titration, and the question is, how much longer do they need to go? We think that the titration based on what we've seen before is helping, but is it needed? We don't know. Will it affect the efficacy at 24 weeks? We don't believe it will, and certainly not at 48.
Helpful. Just a point of clarification for me. With the weight loss or, sorry, with the diabetes study that's coming soon, will you share weight loss data from that trial, or is it gonna be primarily focused on the diabetes-related endpoints?
No, we will share that data. We'll also share the information on the diabetes endpoints.
Okay. Thanks.
Thank you. One moment for our next question. Our next question comes from the line of Mayank Mamtani from B. Riley.
Good morning, team. Thanks for taking our questions and congrats on the progress. On the Phase 2b NASH study design, I know you're not commenting on the total number of subjects yet, but just curious if your interim 24-week readout, you know, will be like the Phase 2b MOMENTUM readout, where you'll include sort of a smaller cohort of patients for that 24-week biopsy, or would you have the full population? Just trying to see, you know, how much excitement there is out there for, you know, enrolling for your NASH study like we saw in the obesity study.
Thanks for the question, Mayank. You know, that readout that would occur in the first half of 2025 would not be an interim analysis. That would be a full readout because it's a readout on the primary endpoint at the established time point for reading it out. We may elect to continue following patients, but the efficacy of the study with regards to the primary endpoint would already be established. When we read out in the first half of 2025, it will be in the entire study population. That's in contrast to the readout that we're gonna have in the latter part of March, where we're actually doing a cut of the patients approximately 160 or approximately 100 and about 50% of the patients and only at about half of therapy.
The readout in the first half of 2025 on that NASH trial will be a complete readout.
Got it. Thank you for that clarification. Then on MOMENTUM, seems like the focus here is on, you know, totality of data rather than any one specific metric such as weight loss. Are you able to comment on what your expectation might be on maybe the discontinuation rate for pemvi versus placebo? Also I think a similar comment if you could have on the hyperglycemia study that you're running in parallel to MOMENTUM. I know the follow-up there is shorter there, 12 weeks. I have one final question after that.
Yeah. Well, we'll have information on the discontinuation rates. I don't anticipate that we'd be talking about other people's data on that readout, but we should have that information for you in both trials.
Your expectation for that rate to be in what range, if you could comment on that?
You know, historically in obesity trials, up until the recent couple of years, the discontinuation rates were quite high. We've seen them come down recently to that 20%-30% range. The other thing to comment on is the fact that discontinuations in any trial like this are not a continuous process. They're probably going to be front-end loaded. That has to be taken into consideration when you look at the discontinuations that are reported at the 24-week readout. We'll have that information. We'll share it with you, and we're happy with what we're seeing so far.
Great. My final sort of, big picture, question, as you, as you prepare for that end of phase 2, FDA meeting, I know it's a bit early to talk about that, but just curious if, you know, you're thinking of a late-stage program, you know, in terms of scale that kind of mirrors, you know, what we've seen with STEP and SURMOUNT program?
You know, which includes an active comparator arm and or, you know, studying, pemvi with certain combination regimens. Are you able to share any initial thoughts on that?
Well, we haven't had that discussion with FDA yet. Obviously, we would have an end of phase two meeting with FDA to discuss the phase three program. Everyone is aware of the phase three programs that were conducted with semaglutide, and that is being conducted now with tirzepatide and obesity. It's not just been a question of the number of trials, but the number of subjects that you need to have in your safety database in order to file for approval. You know, typically, companies have fulfilled those requirements for the safety database by doing pivotal trials. So in both of those programs, there have been four pivotal trials. None of those pivotals that were filed for approval have included an active comparator.
There was a trial that was done in obesity for tirzepatide, where they compared it to an outdated dose of semaglutide or Ozempic for the treatment of obesity. You know, I think, at this point in time, the questions are there. We have a concept that would look somewhat like the other programs. We need to have that discussion with the agency.
Great. Thanks for taking our question.
Thank you. One moment for our next question. Our next question comes from the line of Jonathan Wolleben from JMP Securities.
Hey, good morning. Thanks for taking the question. You touched on this a little bit about the serum lipid data that you're gonna release as well, and I was just wondering if you could give us a little more context on what you consider to be a meaningful reduction when we're looking, you know, across the class for both 24 and 48 weeks? How important do you think that attribute is, you know, moving forward for pemvi's ultimate utilization?
Thanks, John. You know, ultimately the lipid reduction we wanna get is gonna be at 48 weeks. There's probably gonna be progressive improvement over the course of time. With the other programs like tirzepatide, semaglutide, the reduction in total and LDL cholesterol has been minimal. My recollection is in the for LDL in the range of about 3%, maybe as high as 5%. These drugs don't really move cholesterol. They do have very potent effects on triglycerides. We've seen with the glucagon mechanism that you can move LDL cholesterol. We saw that in our first trial. We would hope to achieve something, you know, above that 5% range, hypothetically. Maybe, you know, in that 10% range would be very nice to see.
Again, the number would have to be achieved at 48 weeks. In our first in-human trial, we were able to see a 20%, approximately 20% reduction in LDL and total cholesterol, and that's directly attributable to the glucagon. Our hope is that we would be, you know, meaningfully above the other drugs when we look at the trial at 48 weeks.
That's helpful. Just one on the NASH study. I know you're in the finalization steps of the design, but how are you thinking about dosing? The 1.8 milligram dose seems to be the most effective, you know, so far. Is it worth moving forward to 2.4, or is the 1.8, you know, probably the sweet spot? Just wondering how you're thinking about that.
Yeah.
Thanks.
That's a question that's on our mind, the decision is gonna be data-driven. Obviously we'll make decisions about the NASH trial based on what we see in MOMENTUM, whether we carry the 2.4 milligram dose forward. You know, although we haven't seen any convincing data that 2.4 is better than 1.8, we do know at least from the obesity point of view with semaglutide, that when they got to super obesity, which we define as, say, 110 or 115 kilograms, that serum concentrations dropped. With that there was a reduction in the % weight loss that patients achieved. That wasn't seen with tirzepatide. The question is, will we as a compound behave more like semaglutide or tirzepatide?
At this point, we've modeled out the data, we're not absolutely certain. We've used the 2.4 mg dose essentially as an insurance policy in case we also see that effect. That strategy may be more relevant to obesity than NASH. We are modeling the data. There are systems and modeling efforts that you use, amongst them, things like population PK. We'll use that information that we're developing in half some MOMENTUM data, make a decision about the doses going forward, and that in many ways will drive the sample size, which was one of the earlier questions. If we have multiple arms in the study, including 2.4, that would require more patients to achieve adequate power. If we're not gonna do 2.4, the study would be smaller, and we could get it done more quickly.
That's what's being considered right now, which is why we're not making an announcement about the design or the numbers.
We wanna see the results of the MOMENTUM trial, finish our modeling, and then we'll come up with conclusion. As soon as we have that, we'll share that conclusion and the design of the trial with the street.
Very helpful color. Thanks, Scott.
Thank you. One moment for our next question. Our next question comes from the line of Patrick Trucchio from H.C. Wainwright.
Hi, this is Joe on for Patrick. Thank you for taking the question. Switching gears a little bit to the HepTcell phase 2. Just wondering from the initial readout following the 6 months on treatment, in terms of both clearance and Hepatitis B surface antigen, and seroconversion, how important is it that patients also achieve seroconversion at 6 months?
Dr. Roberts, you wanna take that?
Sure. I think that, you know, obviously that's a, that's a nice-to-have. I think really what we're looking for is the ability to reduce the surface antigen and, you know, this is still a relatively short trial, even at six months of treatment. Seroconversion is, you know, certainly being followed, is certainly of interest. I think that significant reductions in the surface antigen, we set the bar at a one log reduction, is really what we're looking for. The purpose of this trial is to establish that HepTcell has as a monotherapy activity against chronic hepatitis B. It's viewed that in the effective treatment of the disease will require a combination therapy.
You know, we're using this patient population that already is partially controlled, like they might present having received some of the new direct acting antivirals, and then the immunotherapeutic, like HepTcell, being able to drive that clearance of the surface antigen with the presumption of seroconversion. That's how we're looking at that trial.
Thanks so much.
Thank you. As a reminder to ask a question, please press *1 on your telephone and wait for your name to be announced. At this time, I'm showing no further questions. I would now like to turn the conference back to Vipin Garg for closing remarks.
Thank you everyone for participating today. We appreciate this opportunity to share our results and outlook with you. Thank you for your continued interest. Have a nice day.
This concludes today's conference call. Thank you for participating. You may now disconnect.