Arbutus Biopharma (ABUS) Q2 2022 Earnings Call Transcript

Arbutus Biopharma (ABUS 3.03%)
Q2 2022 Earnings Call
Aug 04, 2022, 8:45 a.m. ET

Contents:

• Prepared Remarks
• Questions and Answers
• Call Participants

Prepared Remarks:

Operator

Good morning. My name is Abby, and I will be your conference operator today. At this time, I would like to welcome everyone to the Arbutus Biopharma 2022 second quarter financial results and corporate update. [Operator instructions] Thank you, Ms.

Lisa Caperelli, vice president of investor relations. You may begin your conference.

Lisa Caperelli -- Vice President, Investor Relations

Thank you, Abby. Good morning, everyone, and thank you for joining our second quarter 2022 financial results and corporate update call. Joining me today from the Arbutus executive team are Bill Collier, president and chief executive officer; David Hastings, chief financial officer; Dr. Gaston Picchio, chief development officer; and Dr.

Mike Sofia, chief scientific officer. Bill will begin with a corporate update, followed by Dave Hastings who will provide a review of the company's second quarter 2022 financial results. After opening remarks, we will open the call up for Q&A. Gaston Picchio and Mike Sofia will be available to address clinical and development-related questions.

Before we begin, I'd like to remind you that some of the statements made during the call today are forward-looking statements, which are subject to a number of risks and uncertainties that may cause our actual results to differ materially, including those described in our most recent annual report on 10-K, quarterly report on Form 10-Q to be filed later today, and from time to time in our other documents filed with the SEC. With that, I'll turn the call over to Bill Collier. Bill?

Bill Collier -- President and Chief Executive Officer

Thank you, Lisa, and good morning, everyone. Thank you for joining us today. We appreciate your continued interest and support for Arbutus Biopharma. Now, with the first half of this year behind us, we've made significant progress in advancing our preclinical and clinical programs in support of our mission to develop a functional cure for hepatitis B virus and to treat COVID-19 and future coronavirus outbreaks.

Furthermore, we are on track to deliver on multiple key milestones across these programs in the remainder of this year. And equally important in this volatile capital markets environment, we're well positioned financially to fund our current programs and provide runway into the second quarter of 2024. Now, Dave will discuss the financial aspects during the financial position summary shortly. Now, we are making excellent progress with our two key HBV preclinical programs, that's AB-101, our oral PD-L1 inhibitor, and AB-161, our oral RNA destabilizer.

Now, rather than elaborate on these programs here, I'll refer you to today's press release for those updates and use the time on this call to briefly highlight the rather impressive data on our lead HBV clinical asset, AB-729, that's our RNAi therapeutic. This data was reported last month at the EASL International Liver Congress. Now, as you know, patients with chronic HBV infection receive NUC therapy as standard of care. And while that therapy is generally safe and effective at reducing viral load, less than 5% of patients are functionally cured and usually only after many, many years of therapy.

In our clinical trial, AB-729-001, we wanted to see how treatment with various doses and dosing schedules of our RNAi therapeutic in addition to NUC therapy was handled by patients with chronic HBV who had different baseline characteristics. If patients met certain predefined criteria and consented, we discontinued first their treatment with AB-729 and later their lifelong standard-of-care NUC therapy to see if their undetectable HBV DNA status was maintained and if their s antigen reduction was sustained, which could be a sign of virologic control and potential subsequent functional cure. Now, three major findings were disclosed from this clinical trial at the EASL conference. First of all, we saw a robust reduction in surface antigen between 1.8 to 2.1 log reduction, and that was with 48 weeks of treatment, and the reduction occurred regardless of dose, dosing schedule, or baseline characteristics.

Second, in addition to the meaningful and consistent surface antigen decline, we saw an increase in HBV-specific T-cells and a decrease in exhausted T-cells in patients treated with 729. And third, and what we believe to be of significant importance, when we stopped treatment with AB-729 and stopped NUC therapy in the first five eligible patients that consented, their surface antigen and their HBV DNA responses were sustained at low levels while they were off treatment for at least eight to 24 weeks. Now, in addition, none of these patients showed evidence of virologic nor clinical relapse, and so they did not need to restart their NUC therapy. We believe this data is most impressive as it shows that we were able to take patients off of their lifelong treatment of standard-of-care NUC therapies and still maintain reduced surface antigen and reduced HBV DNA, a potential early indicator of functional cure.

We are continuing to follow these patients, as well as other patients that have consented to stop all therapy, and we anticipate reporting more data in the second half of this year. Now, 729 is one of the most advanced RNAi therapeutics for HBV. And based on the availability of public data, it's differentiated from other RNAis based on its more convenient dosing schedule and immune activation capacity. We're also encouraged by the safety that we see in this and other ongoing trials.

And it's for these reasons that we continue to view AB-729 as a cornerstone agent in a potential curative combination treatment for chronic HBV, either with our own proprietary compounds, or with those in development by other companies, or with therapies that are already approved for the treatment of HBV. Now, also at EASL, we, along with many of our peer companies, reported data on the use of capsid inhibitors alone or in combination in the HBV treatment regimen. And while much of this data is early and inconclusive, our strategy is as follows. First of all, based on data from our ongoing Phase Ia/Ib trial, some of which was presented at EASL, we're planning to conduct a longer duration Phase I study in healthy volunteers with our oral capsid inhibitor, AB-836.

As you will recall, we reported that 836 showed robust antiviral activity with greater than 3.5 log reduction in HBV DNA. Along with this impressive efficacy, however, we saw an increase in ALTs in some patients on the last day of treatment. And so, the goal of the longer-duration healthy volunteer study is to further characterize the safety of 836 by determining whether the ALT flares we saw were beneficial or not before resuming dosing in HBV patients. Second part of our strategy is that we are continuing, in collaboration with Assembly, the Phase IIa proof-of-concept clinical trial evaluating the triple combination of 729 and Assembly's core inhibitor, vebicorvir and NUC therapy, even though Assembly has announced its plans to discontinue the development of vebicorvir.

At Arbutus, we believe it's important to continue the conduct of this trial in order to fully and accurately assess the results. By continuing this Phase II triple combination trial and also evaluating AB-836 in healthy volunteers in our Phase I study, we believe we will obtain data that will inform our use of capsids in a go-forward combination strategy in the development of chronic HBV treatments, as well as help to address open questions in the field. Now, finally, we were gratified to see positive top line results announced by Alnylam for the Phase III study of ONPATTRO in patients with ATTR amyloidosis with cardiomyopathy. As you may recall, we're entitled to tiered royalty payments on global net sales of ONPATTRO, ranging from 1% to 2.33% after offsets, with the highest tier applicable to annual net sales above USD500 million.

Now, this royalty interest was sold to OMERS effective as of January 1, 2019, for USD20 million in gross proceeds before advisory fees. And OMERS will retain this entitlement until they have received USD30 million in royalties, at which point, 100% of the royalty interest on future global net sales of ONPATTRO, which could include additional sales for the expanded indication if it's approved, will revert back to Arbutus. Now, to date, OMERS has received approximately USD14 million. In addition, we retained a second lower royalty interest ranging from 0.75% to 1.125% on global net sales of ONPATTRO with the 0.75% applying to sales greater than USD500 million, and that royalty stream was not part of the OMERS transaction.

So as I wrap up my opening remarks this morning, I'd like to remind you of the key milestones we anticipate in the second half of this year. There are four: first, AB-729 follow-up data, which could include long-term on- and off-treatment data from our Phase Ia/Ib clinical trial; second, initial data from both the Phase IIa combination trial of 729, interferon, and NUC therapy, and the triple combination trial with Assembly's vebicorvir; third, we expect to complete the IND-enabling studies for both AB-101, our oral PD-L1 inhibitor, and AB-161, our oral RNA destabilizer; and fourthly, we expect to advance into IND-enabling studies, a clinical candidate that inhibits the SARS-CoV-2 nsp5 main protease. I'll now turn the call over to Dave Hastings for a brief financial update. Over to you, Dave.

Dave Hastings -- Chief Financial Officer

Well, thanks, Bill, and good morning, everybody. As I've mentioned in the past, our key financial metrics are cash and financial runway. Our cash, cash equivalents and investments were approximately USD201 million as of June 30, 2022, as compared to approximately USD191 million as of December 31, 2021. Now, during the six months ended June 30, 2022, the company received a USD40 million upfront payment from Qilu Pharmaceutical Company related to a technology transfer and license agreement for AB-729 in Greater China; USD15 million of gross proceeds from Qilu's equity investment in the company; and USD300,000 of net proceeds from the issuance of common shares under Arbutus's at-the-market offering program.

These cash inflows were partially offset by approximately USD44 million of cash used in operations. Now, we still expect a net cash burn of between USD90 million to USD95 million in 2022, not including the USD55 million of proceeds received from Qilu. And we believe our cash runway will be sufficient to fund operations into the second quarter of 2024. So, in closing, we are well positioned financially to advance our mission to develop a functional cure for HBV and a treatment for COVID-19 and potential future coronavirus outbreaks.

With that, I will turn the call back to Bill.

Bill Collier -- President and Chief Executive Officer

Thanks very much, Dave. And our operator, Abby, perhaps you could help us now open up the lines for our question-and-answer session.

Questions & Answers:

Operator

[Operator instructions] Your first question comes from the line of Roy Buchanan from JMP Securities. Your line is open.

Bill Collier -- President and Chief Executive Officer

Good morning, Roy.

Roy Buchanan -- JMP Securities -- Analyst

So the Phase I in healthy volunteers that you're planning to study, do you need to or will you talk to the FDA in advance of starting that trial? Did you inform the agency of the recent results on the CHP patients? And did they have any feedback?

Bill Collier -- President and Chief Executive Officer

Good questions. Gaston is on the line with us this morning. So Gaston, perhaps you'd like to answer that question.

Gaston Picchio -- Chief Development Officer

Sure. No, we haven't talked to the FDA about this study. I'll remind everyone that 836 does not have an IND with the FDA, so it was not necessary. Actually, this is going to be done through an amendment to the existing study, Phase Ia/Ib study that we're conducting.

Roy Buchanan -- JMP Securities -- Analyst

OK. Great. That makes sense. And then for 729, the triple combo Phase II interferon and vebicorvir later this year, can you just help us understand the key data points we should be looking for, and which results from those trials are you going to view as a success?

Bill Collier -- President and Chief Executive Officer

Yes. What we've said is it's going to be initial data from those two studies. So I think that's important just to set expectations. Gaston, is there anything else you'd like to add?

Gaston Picchio -- Chief Development Officer

No. I think that really summarizes it.

Roy Buchanan -- JMP Securities -- Analyst

OK. I'll jump back in queue. Thanks.

Bill Collier -- President and Chief Executive Officer

Thanks, Roy.

Operator

Your next question comes from the line of Dennis Ding from Jefferies. Your line is open.

Dennis Ding -- Jefferies -- Analyst

Hi. Good morning. Thanks so much for taking the question. Two for me.

Can you please remind us again your licensing agreement with Alnylam around Patisiran? I think consensus is modeling about USD1 billion in peak sales for Alnylam's ONPATTRO. And based on some of your commentary, it seems like you'd be getting a 2% to 3% net royalty. So this could potentially be a USD20 million to USD30 million annual royalty at peak. So can you confirm if that math is roughly in line with how you guys are thinking about it? And then, my second question is around hepatitis B.

Assembly discontinued the vebicorvir because there wasn't really meaningful efficacy delta versus the doublet. So can you go into a little bit more detail there and your decision to keep the trial going? And perhaps how should this read through to your peginterferon study?

Bill Collier -- President and Chief Executive Officer

Yes. Dennis, great questions. I'll let Dave comment in a moment on the mechanics of the license agreement. What we are trying to do is make clear the specific percentages in our licensing agreements, and also, as I summarized this morning, the details of the sale of that royalty stream, the first royalty stream to OMERS and when it reverts back to us.

We're not making any projections about what Alnylam sales might be or could be. I think that is something that we would refer you back to Alnylam for in terms of what those sales expectations are. But we are being very clear this morning in what our percentages are and how those royalty streams work. So, Dave, anything else you want to add before I turn to the other hep B question?

Dave Hastings -- Chief Financial Officer

No, no, Dennis's math is correct. Once the royalty reverts back to us after OMERS receives USD30 million.

Bill Collier -- President and Chief Executive Officer

And just remember, there are the two royalty streams, the one that we sold to OMERS and then there's the second one which is a slightly lower rate. Your question around the Phase IIa studies. I'm not going to comment on anything that Assembly has or hasn't said about vebicorvir. Our view at Arbutus is it's important once you've started a clinical trial to finish the clinical trial.

When you get to the end of the study, that's the best opportunity to make an assessment of the actual results. So that's what we included in our press release back then that the study continues with the collaboration [Inaudible] in exactly the same way in which it was originally set up. And we look forward to presenting those results when it comes through. So I don't know that we can project anything either about the study or what it means for our own interferon study.

But I'll hand it over to Gaston to see if there's any additional comments you want to make, Gaston.

Gaston Picchio -- Chief Development Officer

Yes. No, I'll just make one comment, which is I think there's basically three types of data in clinical studies related to HBV these days, one is on-treatment response, the other one is end of therapy, and the other one is the follow-up. So as Bill was explaining, we think it's important that we get to the end of the study. And once at the end of the study, we'll refer to even the follow-up period.

And I think we can make a good case for that based on our own 729-001 Phase Ia/Ib study where I think we're starting to appreciate really the value of 729 after we discontinued patients. And if you look at the on-treatment data in that study, as many people have pointed out, the s antigen declines are very comparable across some of the other molecules in the field. However, when it comes to the discontinuation data, we're seeing really 729 performing very well, albeit the data is still limited, and the follow-up hasn't been extensive. But I'll just remind everyone that we don't stop patients as they have been stopping other studies such as in the Janssen one where they stopped the two drugs at the same time.

We stopped first 729, then we waited six months and then we stopped the NUC. So when we say, for example, in our follow-up 24 weeks after discontinuing the NUC, it's really 48 weeks, almost a year after discontinuing 729 and still the DNA and s antigen is holding. So going back to your question, what I'm trying to say here is that I think there's ways of evaluating the efficacy in a study. One aspect is on treatment, the other one is what happens at the very end of therapy, the week 48, and the other one is the follow-up.

So I think we need to wait for the end of the study.

Dennis Ding -- Jefferies -- Analyst

Got it. Thank you, guys.

Operator

Your next question comes from Brian Skorney from Baird. Your line is open.

Brian Skorney -- Baird -- Analyst

Hey. Good morning, guys. Thanks for taking my questions. I guess to start, I have a question on conceptually the oral PD-L1 program.

I know there are a range of commercial PD-1 and PD-L1 inhibitors available that are therapeutic antibodies. Just wondering your thoughts on exploring proof-of-concept studies with any of those to evaluate 729 plus PD-L1 as a mechanism before progressing on oral PD-L1 inhibitors to get a feel of what the combination could yield? And then, also on the ONPATTRO questions. I was just wondering if you could review with us what the duration of the IP around the LNPs and the deal with Alnylam is. Do the royalties last as long as ONPATTRO is exclusive? Or is there a specific IP expiration date when that royalty payment stops?

Bill Collier -- President and Chief Executive Officer

So I'll get Mike Sofia and Gaston just to comment on PD-L1 and whether or not we can do it for like a precursor study with a commercially available PD-L1. But I think the point I'd make before we get into that is what we're aiming for here [Inaudible] PD-L1, which is HBV specific, which is oral, and therefore, which might potentially be efficacious without some of the systemic side effects that you get from some of the others. So with that, maybe Mike Sofia first and then Gaston.

Mike Sofia -- Chief Scientific Officer

Yes. So for the PD-1, PD-L1 access, I think there's clearly mounting evidence supporting the role of checkpoint access in HBV, right? I think you had that early Gilead study that was tantalizing about the role of the checkpoint access PD-1 and PD-L1 and showing, one, functional cure in a number of s antigen reductions in patients, and then more recently, you see the Ascletis study where they took a checkpoint blockade agent and again showed some very interesting and tantalizing data there. So I think there's clearly mounting evidence to support that this access is going to be important in immune -- or is important in immune control for hepatitis B. As far as why we're doing small molecules, clearly, as Bill mentioned, is severalfold, right? We have a belief that we're going to be able to target the liver and therefore reduce potential systemic activation of that checkpoint access because of the concerns of the on-target safety issues that one always sees in the oncology space.

And so, we believe that we're going to be able to circumvent those concerns and those issues with the approach that we're taking in a small molecule. And preclinically, we've also reported on and have more studies that we will report on in the future that clearly support the combination of an RNAi plus a checkpoint blockade at immune activation and reduction in antigen load. So there's substantial evidence to support, I think, the approach that we're taking. As far as a proof-of-concept study, we've been discussing that potential internally, haven't really decided on whether a strategy of -- that would include an existing checkpoint blockade agent with 729 would provide the -- and the timing of it would provide substantial data to help us further develop our current agent going forward.

Bill Collier -- President and Chief Executive Officer

Thank you, Mike. Gaston, anything you want to add?

Gaston Picchio -- Chief Development Officer

Nothing from my end.

Bill Collier -- President and Chief Executive Officer

OK. Now, on your second question around the duration of the patent on ONPATTRO and whether or not the royalties extend beyond expiry dates, I don't immediately have an answer to that question, unless Dave does. I think we may have to get back to you on that one, Brian. Dave?

Dave Hastings -- Chief Financial Officer

No, I don't have any clarification, but it's a typical agreement that would run through the patent life. But we'll confirm that with you, Brian.

Brian Skorney -- Baird -- Analyst

OK. Thanks.

Operator

Your next question comes from Keay Nakae from Chardan. Your line is open.

Keay Nakae -- Chardan -- Analyst

Yes. Thank you. A question about 729, when you provide us the next data update, can you tell us how many patients that you're following who've stopped AB-729 and stop NUCs that you might report on in the next data update?

Bill Collier -- President and Chief Executive Officer

Right. So we have five so far, which is what we've spoken about, and there are more that have consented. I don't know that we have revealed the exact number. Gaston, you can add?

Gaston Picchio -- Chief Development Officer

Yes. I can add a little bit more color there. If you look at the poster from EASL, the discontinuation poster this year, you may see -- and we actually purposely included those subjects there. So we reported on the five for which we had follow-up after discontinuing the NUC, at minimum eight weeks as much as 24 weeks.

But we also included four additional subjects who had discontinued, but we didn't have meaningful follow-up what we consider meaningful follow-up, which will be more than eight weeks. So, for sure, those additional four subjects will be included in the next update. So at the minimum, there will be a follow-up on nine subjects.

Keay Nakae -- Chardan -- Analyst

OK. And there are some others beyond that who haven't -- aren't that far along?

Gaston Picchio -- Chief Development Officer

Yes. I can't comment about others, at this point in time. But for sure, we will have nine.

Keay Nakae -- Chardan -- Analyst

OK. And then, just back to the combo study with interferon, I know you're saying initial data, but what might that consist of?

Gaston Picchio -- Chief Development Officer

So that will consist on-treatment data, basically. That's all we can say. It will be on-treatment data, preliminary on-treatment data.

Keay Nakae -- Chardan -- Analyst

OK. That's all I have. Thanks.

Bill Collier -- President and Chief Executive Officer

Thank you, Keay.

Operator

Your next question is from Ed Arce from H.C. Wainwright. Your line is open.

Thomas Yip -- H.C. Wainwright -- Analyst

Hi. Good morning, everyone. It's Thomas Yip asking a couple questions for Ed. Thank you for taking our questions.

So first, echoing 729 here. We've seen a substantial amount of data at EASL and expecting a few more off-NUC treatment here and then with the combination study data in the second half. At which point should we expect the next company sponsored trial to begin and what that'd look like?

Bill Collier -- President and Chief Executive Officer

Sorry, Thomas, you broke up there a little bit just at the end. I didn't catch the full question, sorry.

Thomas Yip -- H.C. Wainwright -- Analyst

So the last part of my question is what would the next major company-sponsored study look like, considering the Phase IIa looks like is near completion and data has been positive so far.

Bill Collier -- President and Chief Executive Officer

I got you. All right. Well, look, we've made no secret of the fact that it's our ambition to combine 729 with other agents. We would like that to be our own proprietary agents, whether it's our capsid inhibitor, potentially our destabilizer or our PD-L1, with the overall strategy being to suppress HBV DNA, reduce surface antigen, and boost the immune system.

But I think we've also shown with our creative 2A combination strategies that were open to appropriate combination programs with other companies' assets as we move forward. It is still our belief, and I'll let Mike and Gaston comment on this in a moment, that we will need combination therapies for HBV with the continued goal of suppressing HBV DNA, surface antigen, and then ultimately boosting the immune system. So the exact combination study, I don't know that we can specify it right now, but we do see 729 being a cornerstone agent in that particular therapy going forward. So Mike or Gaston, anything you'd like to add? Maybe Mike first.

Mike Sofia -- Chief Scientific Officer

Not for me, Bill.

Bill Collier -- President and Chief Executive Officer

OK. Gaston?

Gaston Picchio -- Chief Development Officer

Nothing from me. Thanks. I think you summarized it well. I think we need to wait to see a little bit what -- how the Phase IIa studies evolve.

Bill Collier -- President and Chief Executive Officer

All right. Do you have any other questions?

Thomas Yip -- H.C. Wainwright -- Analyst

Yes. Just one more from us, and as you pointed out, a combination, obviously, 836 core inhibitor is another key component there. And so, as we anticipate the Phase I healthy volunteers study [Inaudible], other than ALT, can you highlight some other design elements, what else will you be looking at?

Bill Collier -- President and Chief Executive Officer

OK. So, Gaston, do you want to take that one? So in healthy volunteers, remember, so there's no HBV parameters to look at. Gaston?

Gaston Picchio -- Chief Development Officer

Yes, I couldn't really -- there's a little echo there. But -- so was the question whether we will be evaluating other biomarkers? As Bill pointed out, this is in healthy volunteer, so it's primarily safety that we're going to be evaluating in the healthy volunteer subjects. There will be no HBV biomarkers. Was that the question?

Thomas Yip -- H.C. Wainwright -- Analyst

Yes. That's pretty much, other than ALT what else you'll be able to [Inaudible] to point out safety. OK. We're looking forward to the data readouts in the second half.

Bill Collier -- President and Chief Executive Officer

Thank you.

Operator

There are no further questions at this time. I would like to turn the call back over to the presenters.

Bill Collier -- President and Chief Executive Officer

Thank you very much, Abby. And thank you all for your questions. Thanks for joining us this morning. We do really appreciate your interest -- continued interest in Arbutus and look forward to sharing additional updates on both our HBV and coronavirus assets in the second half of this year.

So thank you very much. That concludes our call for this morning.

Operator

[Operator signoff]

Duration: 0 minutes

Call participants:

Lisa Caperelli -- Vice President, Investor Relations

Bill Collier -- President and Chief Executive Officer

Dave Hastings -- Chief Financial Officer

Roy Buchanan -- JMP Securities -- Analyst

Gaston Picchio -- Chief Development Officer

Dennis Ding -- Jefferies -- Analyst

Brian Skorney -- Baird -- Analyst

Mike Sofia -- Chief Scientific Officer

Keay Nakae -- Chardan -- Analyst

Thomas Yip -- H.C. Wainwright -- Analyst

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