Good afternoon, ladies and gentlemen and welcome to aTyr Pharma Second Quarter 2022 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 be given at that time. [Operator Instructions] As a reminder, this conference is being recorded for replay purposes. It is now my pleasure to hand the conference call over to Ashlee Dunston, aTyr’s Director of Investor Relations and Corporate Communications. Ms. Dunston, you may begin.

Thank you, and good afternoon, everyone. Thank you for joining us today to discuss aTyr’s Second quarter 2022 operating results and corporate update. We are joined today by Dr. Sanjay Shukla, our President and CEO; Ms. Jill Broadfoot, our CFO; and Dr. Leslie Nangle, our VP of Research. On the call, Sanjay will provide an update on our corporate strategy, including our clinical program for efzofitimod and later he will go over research and discovery programs in neuropilin-2 T&E sensate platform. Jill will review the financial results and our current financial position before handing it back to Sanjay to open up the call for any questions. Before we begin, I would like to remind everyone that except for statements of historical facts, the statements made by management and responses to questions on this conference call are forward-looking statements under the Safe Harbor provision of the Private Securities Litigation Reform Act of 1995. These statements involve risks and uncertainties that can cause actual results to differ materially from those in such forward-looking statements. Please see the forward-looking statement disclaimer in the company’s press release issued this afternoon as well as the risk factors in the company’s SEC filings and included in our most recent annual report on Form 10-K, subsequently filed quarterly reports on Form 10-Q and in other SEC filings. Undue reliance should not be placed on forward-looking statements which speak only as of the date they are made, as facts and circumstances underlying these forward-looking statements may change. Except as required by law, aTyr Pharma disclaims any obligation to update these forward-looking statements to reflect future information, events or circumstances. I will now turn the call over to Sanjay.

Thank you, Ashlee. Good afternoon, everyone, and thank you for joining us for our second quarter results conference call. We're pleased with the progress we've made in the second quarter as we advance our Phase 3 study of efzofitimod in patients with pulmonary sarcoidosis. This global pivotal study is a major milestone for aTyr in the sarcoidosis community as it is projected to be the largest interventional study for patients with sarcoidosis to date. I'm happy to report that, the studies underway with several centers initiated in the US And importantly, we remain on track to enroll a patient this quarter. As we begin, I'll summarize a few highlights since we last spoke in May. We announced plans to initiate EFZO-FIT, a global pivotal Phase 3 study to evaluate the efficacy and safety of efzofitimod in patients with pulmonary sarcoidosis. We announced fiberglass growth factor receptor 4 or FGFR4 as the target receptor for a fragment of the Alanyl-tRNA Synthetase which is also knows AARS. And we were recently very pleased to receive FDA Fast Track Designation for Efzofitimod for the treatment of Pulmonary Sarcoidosis. Since the announcement of the EFZO-FIT study in May 2022, we've rapidly executed a number of operational milestones to advance the study start. Multiple interactions with regulatory authorities in the US, EU and Japan have occurred, along with the submission of the study protocol, and clinical trial applications to regulatory authorities, APEX committees and institutional review boards. Site selection, qualification and initiation for several sites have occurred as well as an investigator meeting for US sites. It's been a highly productive period for AARS from the point of receiving our FDA green light on the design of the EFZO-FIT study just last quarter to now, and we eagerly anticipate enrolling a patient soon. I'd like…

Thank you, Sanjay. While our primary focus is on advancing our clinical program for efzofitimod, we also have a number of exciting opportunities emerging in research. Our lead preclinical candidate is ATYR2810 or 2810, a fully humanized monoclonal antibody that selectively and functionally blocks the interaction between NRP2, a cell surface receptor that is upregulated on a variety of solid tumors and particularly expressed in many aggressive cancers and VEGF, one of its primary ligands. VEGF is a validated mediator of tumor survival and growth and correlates with tumor invasiveness and metastasis. Current therapies that directly target the classic VEGF receptor signaling do not block the NRP2 VEGF receptor signaling. Preclinical data suggests that by blocking the interaction between VEGF and NRP2, 2810 may be an effective novel therapeutic that combats resistance and reduces invasion and metastasis by downregulating master drivers of lineage plasticity, such as ZEB1 to serve as a differentiated approach, targeting aggressive cancer. Our current work for 2810 is focused on designing and refining our clinical strategy. We are focusing on resistant and highly aggressive solid tumors, where NRP2 is implicated. We are prioritizing tumors based on scientific rationale backed by our preclinical data and support from external literature and then incorporating the clinical development path for each to generate a list of top target tumor types. This approach provides us with data-driven methodology to select indications to target our first clinical study for 2810. And with neuroendocrine tumors, including pancreatic neuroendocrine tumors and neuroendocrine prostate cancer, renal cell carcinoma and triple negative breast cancer, all scoring high using this algorithm. As we continue to hone in on the target indications where 2810 may be the most effective, we are on track to initiate a Phase 1 study in cancer patients in the fourth quarter of 2022.…

Thank you, Leslie. I'm happy to report that we ended the second quarter 2022 with $89.3 million in cash, restricted cash, cash equivalents and investments. Research and development expenses were $9.1 million for the second quarter of 2022, which consisted of product development and manufacturing costs for the Efzofitimod and 2810 programs as well as start-up costs for the Phase 3 EFZO-FIT study. General and administrative expenses were $3.4 million for the second quarter 2022. Common shares outstanding were approximately $28.1 million and fully diluted shares were $33.1 million as of June 30, 2022. While we are taking important steps to advance our clinical, preclinical and discovery programs, we believe we are tracking well with our capital utilization. We continue to implement a data-driven approach to determine capital allocation for programs that warrant for their duration. We believe our current cash position, along with the opportunity for additional milestone payments from our partner, Kyorin Pharmaceutical, supports this approach. Now, I'd like to turn the call back over to Sanjay before we open it up to Q&A.

Thank you, Jill. As we've discussed here today, we've really had a highly productive quarter, particularly for efzofitimod clinical program. And while we focus on advancing efzofitimod, we've continued to capitalize on our intellectual property portfolio by unlocking new ways to create therapeutics from this novel biology through the discovery of molecular targets for tRNA synthetase and the expiration of their rolling disease. We believe, we're in a strong position financially. And with the launch of the EFZO-FIT study, we're looking forward to entering the next phase for the company. We appreciate your support and look forward to providing additional updates this quarter. I now open it up to questions.

Thank you. [Operator Instructions] Our first question comes from Gregory Renza with RBC Capital Markets. You may proceed.

Hey, good afternoon Sanjay and team, congratulations on all the progress. Thanks for taking my questions. Sanjay, maybe I can just start with respect to the regulatory progress outside of the US. I know you had some points at the top there. Just to build on that maybe a little further, I'm just curious how we would think about the level of regulatory alignment in ex-US countries just regarding steroid sparing as a primary endpoint, and maybe just touching on the strategy for ex-US approval and even launch? And then maybe I'll just ask more broadly, if I may. As you speak to getting the sites set up and getting a patient on drug for third quarter, I'm just curious if you could comment a bit on what you see as just some of the broader challenges and risks to the timeline as you build alignment with the centers and get patients on trial? Thank you so much.

Thanks for the questions, Greg. So first off, with regard to regulatory interactions. What I can say is, they've been very productive. And frankly, the alignment has been 100% regarding the primary endpoint. I think it speaks to the fact that steroid reduction now universally is being viewed quite favorably as an approvable endpoint. And you've seen other companies start to, of course, in other indications, receive approvals based on steroid introduction. Our plan is, I think, a really crisp and well-thought out plan that not only FDA, not only Japanese regulators, but the larger European regulators continue to support and frankly, the back and forth have been very easy. I think it also helps that we have buy-in from probably upwards to 60 experts worldwide. Folks have been waiting a long time for a sarcoidosis program to get into Phase 3. To my knowledge, we're the only one ever to kind of get to this point. So I do think that there's a really strong desire to get a drug approved. I think we've smartly advanced the program and now it's really set up well for success. When you think about some operational challenges, you always have to think about planning ahead of time to really mobilize sites and get things moving. Having some of the launch activities at ATS, where we started to bring people together, show them our data. This has been rather fast. So, the fact that we've been able to basically from one quarter flip-the-switch here and are close to enrolling a patient, I think it speaks to not only our clinical operations team, which is, I would say, two standard deviations better than anybody out there in the industry. They've demonstrated that they can get a trial done through COVID, a respiratory pandemic and we finished a respiratory trial in a very great population here. So, I think we have a great team, but also the patient and provider community have been so excited to get involved with this trial. We want to keep that excitement and that sort of acceleration that's occurred from our Phase 2 data and continue to build upon that as we go into this trial, so that we can move as quickly as we can. Patients don't want to wait. We don't want to wait to get the results out. We know it's a longer trial. But thus far, I would say we're in a fast start here.

That's great, Sanjay. I appreciate the color and congratulations again.

Thanks, Greg.

Thank you. One moment for questions. Our next question comes from Joe Pantginis with H.C. Wainwright. You may proceed.

Hey, everybody. Good afternoon. Thanks for taking the question. Sanjay, first, a logistical question on efzofit. What do we need to see to be able to get cure into enrolling patients in the study?

Yes. I think it's just a matter of -- and I can't-- Kyorin itself being its own company, they're operationalizing in Japan. But thus far, I can tell you that we have no hiccups from a regulatory point of view with Japan. And I think it's just a matter of now opening sites and getting patients dosed over there. We are focusing on the US first, and I would expect the first patient to be enrolled in the US. And then I think in the following months, we'll look for Japan and Europe to start to enroll as well. So, what I can tell you is, it’s hard to guide to exactly when a patient might be enrolled in Japan, but we're tracking really well over there. And thus far, there's nothing in the time line that is slowing us down.

Got it. Got it. And then, when you talked about efzofit and looking at certain inclusion criteria, I was wondering if you can describe a little bit of the exclusion criteria, because if I'm looking at some of the differences between the earlier study in efzofit, look at some differences with regard to the initial fibrosis level as well as what appears to be differences in the imaging that I think could potentially broaden the population.

Yes. I'm glad you brought that up. So, let's first address the imaging. The field has moved back into HRCT as being the appropriate imaging metric. Now, it's not an endpoint. It's not a validated endpoint that the regulators would approve, but we are using it to enrich, I would say, to de-rich in a way patients that are too fibrotic. We know our drug works best when there's active inflammation. Therefore, we want to make sure that we have patients that are not too fibrotic. Now in previous studies, I think we had the opportunity to exclude based on PET scan. But as I said, HRCT is now the sort of more acceptable way of delineating fibrosis and inflammation. I do think our cutoff being at 20% aligns with some of the other therapies. You've seen tocilizumab and nintedanib in the scleroderma trial, have that as a cutoff. What do I expect to happen? The toughest patients to treat with efzofitimod, I expect that we will be able to, frankly, exclude some of those patients. We may end up with more patients with some mixed disease, but still enough inflammation that we can move their disease and modify it. So I think it does two things for us. Number one, those patients that may be too far gone to do well with efzofitimod, we think will exclude those patients. But we also think we'll capture some patients and maybe even this has relevance to a larger market opportunity with patients who have mixed findings, but still enough inflammation so that we can impact and reduce their steroids. Remember, these are patients that also, if you start to have fibrosis, steroids can make your fibrosis worse. So they're in a tricky situation. I think this points to our ability to enroll better, enroll smarter and probably long term, have a much larger footprint of market potential here with patients with mixed disease.

Got it. That's helpful. Thanks. And then just real quick, if you don't mind. With regard to 2810, are you willing to share either a, let's call it, an initial communication strategy subject to change, obviously, about how would you look to release news from the upcoming Phase 1 study. Do you have a proverbial magic number of patients that you'd want to see a couple of responses first or a critical mass of patients before you release news, because, obviously, these are going to be a tough patient population?

Yeah. So I think the first step is -- and then Leslie alluded to it, we have a number of top target tumor types. So we've outlined based on, I think, smartly looking at literature, looking at our data, talking to experts, we're going to be able to enrich right off the bat. So, I think, first, understanding what the trial exactly looks like and the expectation here is I will come back to you and the rest of the public to basically outline what that clinical protocol looks like. Then you're going to be able to get into when are you going to have batches of data available? Is it going to be at the end or iteratively? Given that it's an early trial, it's a safety trial, the expectation here is, we could probably have a more steady flow of information first starting with safety, but then also looking at pockets of response in these early trials, similar to what -- how multi-cancer studies are set up where you at least want to check the box there early on, some safety work. But then you can start to dig into, okay, from these enriched tumor types, where are you seeing the best effects. And then, that's going to further define what the next steps for that program are going to be. But I'm really proud of the work the research team has done here to, again, really be data-driven. And I would say, we are one of the most data-driven biotech companies out there. So we're not -- our goal is to set up these experiments for success, learn along the way, shut down the valves of things that aren't really working well, but then really focus on what's working well. So stay tuned for that, Joe, I'm anxious to get those details out soon as well.

Got it. Thanks a lot, Sanjay.

Thank you. A moment for questions. Our next question comes from Hartaj Singh with Oppenheimer. You may proceed.

Great. Thank you. Thanks for the couple of questions and really nice update, Sanjay and team. Sanjay, you described the taper in the efzofit study. I believe going from like you start taper about two weeks and going to about 12 weeks, as you're recruiting these patients. Can you -- that's pretty -- I mean, maybe aggressive relative to the PD study, right? I mean, is that a good sign that you're feeling confident you can take these patients off more quickly on steroids and try to get -- not a good sign that you're feeling confident you can take these patients off more quickly on steroids and try to get them to as low steroid level as possible. So that's the first question. And then how does that impact enrollment for the efzofit study that taper? And then secondly, you talked about how your clinical team is now starting to really kind of come together. If you have an IND for 2810 in the fourth quarter, second project in the clinic. What are the main differences you're seeing in developing your targeted therapies between oncology and inflammation. And that's for the question.

So I'll break this into parts. First is the taper itself. And I'll start maybe with enrollment. The fact that we saw patients get to zero in the last trial was really an outstanding finding and really unexpected in such a fast manner. So in a six month trial to see in that last cohort, three out of nine patients get to zero. That was really unexpected. But it also has, I think, led a fire around the patients, the providers, the internal team here to say, let's really try to actually see if this drug could have even more steroid sparing effects, maybe a steroid replacement type of effect for certain patients. That's actually helping us with enrollment and some early projections because patients now look with that data that we produced and say this -- I might have an opportunity here to get all steroids, if I participate in this trial. So I think in many ways, the design is going to help us enroll better. Now with that in mind, we have to be a little bit more careful about how we taper. We had an eight-week taper that brought folks down from anywhere to 10 million to 25 milligrams of pride zone down to five over eight weeks. We have to go -- now we're trying to go to zero with essentially a similar population, 7.5 to 25. So we got to give it a little bit more time. So we've added four weeks. So I think in my mind and the experts mine, we've designed this very closely with people like Bob Hoffman, Dan Culver, some of the experts that were involved in the last trial. We feel bullish with the goal here to get to zero. Patients want to actually try to go to zero, and we're allowing for a little bit more time for more weeks. That's also not going to hurt us in our analysis because you really are -- now we're looking at a full -- basically a year trial. So we're adding another 20, 24 weeks of therapy here. So I think all in all, this is going to provide us, I think, a lift from enrollment. It is something that I think we're going to challenge the norms here. It's why I think the market opportunity is closer to $3 billion when you talk about what efzofitimod could do for patients, not only sarcoidosis, but in a number of interstitial lung disease. And we think as time goes on, hopefully, the investment community picks up on the fact that what's staring you in the face and hitting you in the mouth here is a transformative multibillion-dollar therapy. We hope people start to pay attention to that. The patients and providers already have, the regulators have, I think this is something that people need to wake up and see the kind of impact we can make here.

Yes. No, that makes sense. And then just the broader question, Sanjay, on as you're going from developing an inflammation to oncology, and I think this is one of the actually very unique things for me for HR is that you've got some pathways that you don't really encounter with a lot of other companies, I imagine, scarcity value. But then what does that do to your discussions with the regulators as you're looking at NRP2 synthetase, et cetera?

Yes. Okay. So that's – that's the important follow-up here. I think first and foremost, validating the platform is what EFZO-FIT did. So that's also given -- we've always had comfort in that. But externally, there's a lot better comfort, we produced some data already from a safety perspective. Now I understand the modality there is different. It's an antibody, so it's a bit more straightforward. But the approach is still for us to basically say, yes, we are playing outside of the norms of most drugs in oncology, and we are breaking ground on a new area in oncology. Again, it's really guided around understanding of inflammation and fibrosis, and we've used that term quite a bit. Both are mechanisms that play a huge role in oncology as well. So I think what we've done here is smartly designed, again, a plan regulators, I think, are becoming more understanding around our biology. It's making those kind of interactions easier. It's speeding things up. But at the same time, we're going to really create real cogent clinical strategies because, again, I think our goal here is to run smart experiments that we believe will succeed and we'll do that even early on. In oncology, you have to do that really, really early on because in many ways, the market expects to see response even in those early patient trial, you don't do healthy volunteer work. You go straight into patients, for example. So we will incorporate, I would say, a more accelerated way of demonstrating effects for 2810. And lastly, I'll just say, even the FGFR finding, again, we're now anchoring and we feel really, really good around the process that we have here. And that's a receptor that is better understood than neuropilin-2 and clearly has more implications with regard to liver fibrosis, liver cancer, kidney fibrosis, a lot of literature there. We're going to be hitting it from a different angle. And our angle has already produced the most really fantastic findings in sarcoidosis since the '50s. So I think there's something to be said around the process that Leslie has also developed here with the research team, so that we create a steady stream of derisked and potentially really transformative pipeline candidates.

Yes. Thanks, Sanjay, for all for the questions and all the color. Really appreciate it.

[Operator Instructions] Our next question comes from Yale Jen with Laidlaw & Co. You may proceed.

Hello. Good afternoon and thanks for taking the questions. My first question is that Sanjay, you have mentioned that the last time that the enrollment to data release is roughly two to 2.5 years, I guess, and whether the time line still holds?

Yeah. Hi Yale, absolutely, I mean, we're just getting started. I will allow me to update guidance depending on how enrollment goes, give me. Let's get the 70 centers up. Let's start to see some data. But I think it's fair to say that this data, we'll be looking at that that time line that you've laid out there. I mean, as we get closer into 2023, 2024 -- we're going to know then once that last patient gets enrolled, but I think based on our assumptions and current projections, that timeline is correct.

Okay, great. That's very helpful. And then, you actually mentioned earlier in your answer that you could have some mixed type of patient other than the fibrosis in the lung. So my question to you is that, if so, would you also start to analyze the, I guess, something relief or other aspects of those mixed patients on other fibrosis in other tissues and start to get some insight into whether potentially expanded to other indications.

So I think what you're getting at is the extent of fibrosis. And let's understand all of these patients have some fibrosis. Some might have just 1% or 2%, others may have 15% or 16%, but they all may have cough shorten its breadth and be on a significant amount of prednisone. To your point, do we have any baked in stratification to look at more than 10%, more than 15%. Not necessarily. I mean, these are going to be tertiary endpoints in the end. What we do know is Neuropilin -- targeting Neuropilin seems to be a potent anti-inflammatory and anti-fibrotic. We have focused on the anti-inflammatory effects. In a longer trial, we may start to see that we're bending things from a fibrotic perspective. So we're just going to be prepared to look at that. I think when you think about Efzofitimod and anti-fibrotic. In the end, that's really what we're trying to do here. We're trying to prevent fibrosis from taking hold in these patients. It's also why I think experts in other areas like even IPF are really intrigued about wanting to try of Efzofitimod over there, because nothing can really change and disease modify. We've seen therapies in development now that have $1 billion valuation and not show dose response, for example. And there's a lot of hope, I think, in IPF to see anti-fibrotic effects. We're going to interrogate that in our trial because sarcoidosis is certainly in the same family as IPF. But being more inflammatory, that's what we are prioritizing. That's why steroid reduction is our primary endpoint. But to your point, I do think that the larger market opportunity, again, I'm going to stress here is several billion dollars, because we have a unique offering that frankly sits outside those approved therapies. The fact that we shall see symptom improvement is something that no therapy in Fibrotic Lung Disease has really shown. So I think this is where there's a lot of excitement. We're going to keep our eyes on the prize execute well on the sarcoidosis trial, but there is significant interest, yes, in even some of those other fibrotic conditions.

Okay. Great. And maybe last one here is that, I know you're going to start a Phase 1 study in fourth quarter. Should we just assume some of those typical cancer study, the dose ranging study design may be such as three plus three, maybe a multiple or single dose ascending and the last year was what might be the PD readout you may have? So what kind of biomarker you might also look for? And thanks.

I'm going to hold off on the biomarker part, because that's going to have a lot to do also with the tumor type that we pick. What I can tell you is it will have some elements. We tried ourselves of being real cutting-edge drug developers here. So I think we're going to have an expedited adaptive type of approach. But yes, I think we know in cancer, there are certain boxes you have to check with regards to modular, safety, cohorts and then potentially then looking at efficacy in certain tumor types. So it will have some classic elements, because we don't -- we want to get the IND approved. But I also think there's going to be some opportunities here to, again, enrich derisk and try to get an early signal. Once I actually know, for example, if it's triple-negative breast that we're focusing a little bit more on, neuroendocrine we can then kind of get into a cadre of PD biomarkers to start to look at. We think we have a very differentiated opportunity mechanistically, and we're quite bullish on that program as well as we set it up.

Okay. Great. Thanks a lot. And best luck and congrats on all the progress this fall.

Thanks, Yale.

Thank you. And I'm not showing any further questions at this time. I would now like to turn the call back over to Sanjay Shukla for any closing remarks.

So thanks everybody for tuning in today. Obviously, a lot of operational progress, maybe not the sexiest updates, as we've had in the past where we're putting out clinical data. But certainly, a quick turnaround here from last quarter, and I'm really proud of the work the team has done to really get this study launched basically in a quarter here from the green light. Appreciate everyone's interest, continued support, and we look forward to talking to you in the future. Thank you.

Thank you. This concludes today's conference call. Thank you for participating. You may now disconnect.