Good day, and thank you for standing by. Welcome to the BioCryst Pharmaceuticals First Quarter 2022 Earnings Conference Call. At this time, all participants are in a listen-only mode. After the speaker's presentation, there will be a question-and-answer session. To ask a question during the session, you will need to press star one on your telephone. Please be advised that today's conference is being recorded. If you require assistance during the conference, please press star zero. I would now like to hand the conference over to your speaker today, John Bluth, Head of Investor Relations at BioCryst. Thanks, Daniel. Good morning, and welcome to BioCryst's first quarter 2022 corporate update and financial results conference call. Today's press release and accompanying slides are available on our website. Participating with me today are CEO Jon Stonehouse, CFO Anthony Doyle, Chief Commercial Officer Charlie Gayer, Chief Medical Officer Dr. Bill Sheridan, and Chief R&D Officer Dr. Helen Thackray. Following our remarks, we will answer your questions. Before we begin, please note that today's conference call will contain forward-looking statements, including those statements regarding future results on audited and forward-looking financial information, as well as the company's future performance and/or achievements. These statements are subject to known and unknown risks and uncertainties, which may cause our actual results, performance, or achievements to be materially different from any future results or performance expressed or implied in this presentation. Do not place undue reliance on these forward-looking statements. For additional information, including a detailed discussion of our risk factors, please refer to the company's documents filed with the Securities and Exchange Commission, which can be accessed on our website. I'd now like to turn the call over to Jon Stonehouse. Thanks, John. With nearly $50 million in net revenue in the first quarter of this year, ORLADEYO quarterly sales continue to provide us with real-world evidence and confidence quarter after quarter that we remain on track for no less than $250 million in net revenue this year and $1 billion in global peak sales. What's particularly important this quarter, as we face the expected headwinds from some payers requiring reauthorization, higher co-pay deductibles, and the impact of the Medicare donut hole, is that our team still tapped into strong patient and physician demand for ORLADEYO and produced quarter-over-quarter revenue growth. ORLADEYO plays a critical role to our strategy, and the growing revenue stream is creating value by providing evidence our company can discover, develop, and commercialize successful products and by strengthening our financial position. There's plenty of opportunity to capture too. Charlie will go into more detail on this and talk about the things we're doing to get this important medicine to every HAE patient who wants to try it around the world. Why wouldn't they if they had a chance to be controlled on one capsule once a day? For the remainder of the year, each quarter, we expect that there will be steady revenue growth over the previous quarter, culminating with an annual revenue of no less than $250 million. That's more than a doubling of the first-year sales and a quarter of the way to our $1 billion peak sales expectation in just the first two years of launch. Based on what we see so far this year and the trajectory we're on, we remain very confident we can achieve these targets. Our pipeline is another important part to our strategy. Our team has made significant progress in the investigation of the serum creatinine increases in patients in our BCX9930 clinical trials since we first identified this a month ago. While the investigation is not complete, we believe dose is the most likely cause of these elevations and will work with regulators to see if there's a path forward to restarting clinical trials. Bill will share more details on this topic. Regardless of the outcome, patient safety is paramount to us, and finding a safe and effective Factor D inhibitor remains something we are very committed to because we know many patients suffering from complement-mediated rare diseases are waiting. Whether it's 99-30 or one of our backups or both, our goal remains to bring a highly competitive oral Factor D inhibitor to patients. We will follow the data and make thoughtful decisions on what to invest in and what not to invest in based on how it helps us reach this goal. Time to market, how the competitive landscape changes, and our product profile will also be important factors in our capital allocation decisions. When you step back and you look at our company in its entirety, you'll see it's a company with a growing revenue stream coming from a product and a team that's showing they can execute and successfully launch a drug that we believe will grow to $1 billion at peak. We have a pipeline to create even greater value with the goal of bringing more and more products to the market to patients suffering from rare diseases. We have a discovery platform that has and will continue to discover innovative molecules to fill our pipeline even further. Finally, we have a solid balance sheet to allocate capital to those things we believe create even greater value. When you see all of that, you see meaningful value creation today and even greater value creation for the future. I'll now turn the call over to Charlie to talk about ORLADEYO. Thanks, John. The first quarter was another strong one for ORLADEYO. The patient base continued to grow steadily, and even with the headwinds of payer reauthorizations, we finished with $49.7 million in ORLADEYO sales and are on track for no less than $250 million in sales for the year. We are confident about the growth trajectory because it is becoming increasingly clear how well patients are doing on ORLADEYO. We are seeing three cohorts of patients emerge. Those who are doing great and stay on therapy, those who are still deciding if this is the best treatment for them, and those who decide it isn't. The size of each of these groups is fluid, but the group doing well and staying on therapy is by far the largest and is driving our sales growth. What we are seeing is that the patients most likely to do well and stay on ORLADEYO are those who were well-controlled on an injectable prophylaxis before switching. We are getting real-world evidence from our specialty pharmacy showing that patients who were well-controlled on Takhzyro at baseline, for example, are staying equally well-controlled on ORLADEYO. These patients switching from Takhzyro represent a sizable and growing cohort because 50% of all patients on ORLADEYO in Q1 originally switched from another prophy, and half of those came from Takhzyro. That switching trend continued for patients starting ORLADEYO in Q1 and shows no sign of changing. The real-world evidence is consistent with the 96-week data from our pivotal study showing that the median attack rate was zero in 16 out of the last 17 months of the trial. It is also consistent with data from our long-term safety study, showing that patients switching from injectable prophy were attack-free in over 80% of months on ORLADEYO. Further evidence of how well patients are doing is that after switching to ORLADEYO and the prior authorization process is complete, 78% of Takhzyro patients and 73% of HAEGARDA patients continue on ORLADEYO for at least six months. Patients switching from acute-only therapy have similar retention. We are also seeing that access and reimbursement correlates with long-term patient retention. Overall reimbursement access improved in Q1, and now nearly 80% of patients on ORLADEYO are on paid drug, up from about two-thirds in the second half of last year. This improved access is important not only because more patients are receiving paid therapy, but also because we are seeing that 70% of patients who reach paid therapy continue on ORLADEYO for at least 12 months, compared to 60% retention for patients who remain on long-term free product. We believe the size of the patient cohorts that I described are fluid because some patients are making their decision about ORLADEYO too quickly. 1/3 of all discontinuations to date have occurred after just one shipment, and 50% overall within the first two shipments. Education and expectation setting are critical in the early phase of treatment, and we have added new members to the team to support patients in this process. If a patient has a high probability of doing well, those well-controlled prophy switchers, for example, we wanna make sure they don't give up too quickly after an early breakthrough attack or side effect because they might miss out on the long-term benefits of ORLADEYO. The clinical trial and real-world evidence that I described is convincing physicians, leading to greater breadth and depth of the ORLADEYO base. In the first quarter, new patient prescriptions were evenly split between new prescribers and repeat prescribers. We also saw an even split in new prescriptions coming from our tier one top 500 HAE treaters and the broader base of treaters. Our latest quarterly survey with allergists again matches the prescribers' prescribing trends and tells us how much more opportunity remains. We surveyed another 60 allergists who treat an average of eight HAE patients. They were already prescribing ORLADEYO to 13% of their patients and predicted growth to 23% over the next 12 months, neck and neck with Takhzyro for future market leadership. We expect the favorable patient outcomes, new prescription trends, and improved reimbursement to drive steady quarterly growth on our way to no less than $250 million this year. The patient growth trends we see give us confidence that at peak, we will reach a stable base of at least 2,000 patients in the U.S. who have great outcomes on ORLADEYO. That's just 25%-30% share out of the 7,500 diagnosed and treated patients and would generate up to $800 million in annual sales from the U.S. alone. As we've noted before, the U.S. will account for the great majority of sales in 2022, but international launches are gaining momentum. We have launched with our own team in Germany, France, the U.K., Norway, Sweden, and Denmark, and with partners in Japan and UAE. We anticipate several more launches and reimbursement approvals this year, and we are busy preparing multiple regulatory and reimbursement submissions. The favorable reception that ORLADEYO is getting from regulators, payers, physicians, and patients across countries and regions bodes well strategy to bring ORLADEYO to patients around the world on our way to $1 billion in peak global sales. I'll turn the call over to Bill for an update on our clinical program. Thanks, Charlie. While we have not completed our investigation into the serum creatinine elevations we observed in our BCX9930 clinical program, we have made significant progress, and I want to provide an update for you today on what we have learned thus far and what the next steps are. As you may recall, at the time we announced that we were halting dosing in April, we had four active clinical trials with BCX9930. These are summarized on slide four. Patients in REDEEM-1 and REDEEM-2 randomized to BCX9930 and patients enrolled in RENEW began the trials by starting immediately at 500 milligrams twice daily. Patients in the long-term extension for our proof of concept study had started at lower doses, and all patients were ultimately moved up to the 500 milligram dose. We currently have three patients from our REDEEM trials who had severe or moderate elevations in their serum creatinine, beginning several weeks after starting BCX9930 at the 500 mg dose level. These lab findings indicated renal injury, which is why we proactively paused enrollment to investigate further. Two of the patients were hospitalized for observation and evaluation, and both were discharged after their initial evaluation. These three cases involved a rise in serum creatinine of about 2x-4x the upper limit of normal. We are pleased to see that kidney function has improved in all three patients, with a fall in their serum creatinine levels during the short period of observation thus far. two of these patients have been discontinued from therapy. The patient who had the smallest rise in serum creatinine continues on BCX9930 at this time. Three patients we noted with early onset increases in serum creatinine represent approximately 1/3 of the patients randomized to 9930 in the REDEEM studies. In other patients in the REDEEM trial, the serum creatinine has remained similar to baseline. Additionally, during the investigation, we learned that about 40% of the patients in the long-term extension study have had slowly evolving, late onset, mild to moderate increases in serum creatinine, which started about three-12 months after they switched to the 500 mg dose. This was not observed during treatment with doses lower than 500 mg, and none of these patients have experienced early onset severe serum creatinine elevations. Here is the summary of what we know so far. We are observing an emerging signal of increasing serum creatinine early during treatment and also after chronic treatment. Although there may be other factors contributing to these events, it is prudent to assess this signal as probably related to BCX9930. It is noteworthy that we have not seen elevations of serum creatinine at doses lower than 500 milligrams, and we have not seen early onset increases in serum creatinine when we start with a lower dose. In the proof of concept study, we have also seen that BCX9930 has encouraging efficacy in PNH patients with increases in hemoglobin and reduced transfusions at both the 400 mg BID and 500 mg BID doses. Of course, we're very disappointed by these safety observations, especially considering the strong efficacy we have seen with BCX9930 and the unmet need for better treatments for patients. No one wants patients to experience these types of events in clinical trials, and the key question for us now is to explore with regulators whether or not there is a path forward for the program from a benefit risk perspective. Throughout our investigation, we have been and continue to be in active dialogue with the study sites and investigators, our independent data monitoring committee, and the FDA and other regulators. The FDA has placed the BCX9930 program on a partial clinical hold. Under this partial clinical hold, BioCryst may not enroll new patients in its BCX9930 clinical trials. However, patients already enrolled who are receiving clinical benefit from BCX9930 treatment and have no other available treatment options can continue to be dosed and remain in the trials. BioCryst had already taken this same action voluntarily prior to the partial clinical hold, and we have, of course, provided study sites with updated informed consent language for patients and guidance to investigators to reflect the new safety risk. What comes next? We know BCX9930 shows strong clinical efficacy. This clinical efficacy is seen at both 400 mg and 500 mg, as illustrated on slide six. These efficacy observations are supported by the PD data from BCX9930, showing complete inhibition of Factor D at both the 400 mg and 500 mg dose levels. Based on what we are learning in the investigation, the preliminary evidence points to both 500 mg twice daily dosing and the immediate start of that 500 mg dose level without a period at a lower dose first as plausible contributory factors for the serum creatinine increases we have observed to date. Since we have also seen similar efficacy with BCX9930 at 400 mg and have not seen serum creatinine elevations at this dose, we plan to complete the investigation and then consult with regulators regarding a possible path forward with amended protocols using stepped dosing to 400 mg. If they agree with an approach like this, we could restart the clinical program. But if they do not, unless we identify another path to pursue, we would likely terminate the program. We expect to have clarity from regulators on whether or not there is a path forward for BCX9930 by the end of the third quarter. We do not plan on providing interim updates as we progress through these interactions. However, we look forward to completing our investigation and regulatory discussions, and we plan to update you once we have clarity on our next steps for the BCX9930 program. Now I'd like to hand the call over to Anthony. Thanks, Bill. Given the early stage of our discussions with regulators, it's premature to provide revised guidance for OpEx. In the scenario where we recommence enrollment, spend would likely be at the low end of the $440-$480 range that we guided to previously. If we discontinue the BCX9930 program, spend in 2022 would be lower than that. What I can be more certain of is the strong performance of ORLADEYO and our confidence in our revenue guidance of no less than $250 million for this year and peak global sales of $1 billion. This, as well as our other pipeline assets, give us a tremendous base to build on. You can find our detailed first quarter financials in today's earnings press release, and I'd like to call your attention to a few items. Revenue for the quarter was $49.9 million, of which $49.7 came from the net sales of ORLADEYO. Having finished 2021 with revenues of $122 million, this puts trailing 12-month revenue for ORLADEYO at over $161 million as we progress towards our 2022 guidance of no less than $250 million for the year. Operating expenses, not including non-cash stock compensation for the quarter, were $90.3 million. Quarter 2 of 2022 will likely be higher given the annual guidance that we gave on OpEx previously, with 99/30 investment in CMC and trial expansion being the main drivers. Cash at the end of the quarter was at $447 million. With the $75 million from Athyrium that we've agreed to draw in mid-2022, our balance sheet is very strong. We're deploying this capital towards programs that can create value for the company and for shareholders. Investment in ORLADEYO continues. We are investing to strengthen our launch here in the U.S., while we also expand our reach in bringing ORLADEYO to patients around the world. We will also continue to invest in our pipeline. The targets that we go after are hard targets, and there are always challenges. The challenges that we had with avoralstat and HAE paved the way for the success that we are now having with ORLADEYO. We are hopeful that we can continue to move forward with BCX9930. As with the strong efficacy data that we have shown thus far, we think that we can help patients in PNH and beyond. We will be smart about it. If we can move forward, we will move forward with speed and focus. If we cannot, then we will reallocate capital to programs that can add value in complement and in other rare diseases. With the strength of the ORLADEYO launch, the discovery team, and our development pipeline, and our strong balance sheet, we are well-positioned for future growth. Operator, we'd now like to open it up for Q&A. As a reminder, to ask a question, you will need to press star one on your telephone. To withdraw your question, press the pound key. In the interest of time, we ask that you please limit yourself to one question and one follow-up. Please stand by while we compile the Q&A roster. Our first question comes from Ken Cacciatore with Cowen. Your line is now open. Hey, guys. Thanks for the update. Just wondering if we could get a little bit deeper into some of the analysis on the 400 mg. Can you talk about duration on treatment or anything that you've learned from that patient group? I know you talked about efficacy, but just wondering, as you looked into the safety, seems as if the duration on that, when they were kind of moving through was a little bit shorter. Just wanna know any more analysis you could provide on that. Then also just wondering if we talk about the R&D, understanding the commentary on reallocating. Can you just give us some perspective, however, on the% that's being allocated right now to BCX9930? Maybe a little bit more color on would it be completely allocated, you know, unfortunately, if we have to stop it? To what degree do you think going forward there would be adjustments lower? Thanks so much. Bill, you wanna take the first one, Anthony second? Sure. I can. Thanks for the question. The way that the proof of concept study was done, because this is such a rare disease and to be efficient in that trial, we had a combination of intra-patient dose escalation as well as starting at higher doses in sequential cohorts of small numbers of people. The result of that certainly is that, as the trial matured, the duration on 400 mg was substantial, but the duration on 500 mg was quite a bit longer. As I mentioned in my remarks, the observations are confined to the 500 mg period. It's a plausible hypothesis that that's what's driving this, but, you know, we can't rule out other factors, obviously, but that's where we stand on the data. In terms of capital allocation, so what we've said is that last year, for example, the Factor D program was around 62%-63% of our total R&D spend, and that this year was gonna be even higher. Now, hopefully we can move forward, albeit with a delay. If we can't, we'll make sure that the areas that we reallocated to have those potentials to create additional value. I think we've been clear it'll be potentially in both the complement space and in other rare diseases where we think we have a strong pipeline and a really good discovery team. Great. Thank you. Thank you. Our next question comes from John Wolleben with JMP Securities. Your line is now open. Hey. Thanks for the update and taking the questions. Along the same lines on BCX9930, I just wanna make sure I heard this right. Were there nine patients enrolled so far across the REDEEM trials? Were the three patients with elevations, were they all treatment naive or C5 inadequate responders? Any other common characteristics between the patients with the elevations? Thanks, John, for the question. You know, as I mentioned in the remarks, you know, we only unblinded the patients who had the elevations. It's an estimate that approximately 30% of the enrolled patients have had those elevations in the REDEEM studies, and those three patients do come from both REDEEM- 1 and REDEEM- 2. Maybe one for Charlie, if I may. You mentioned the number of patients switching from Takhzyro. Do you have any data on how long those patients were on Takhzyro before switching? Hey, John. No, we don't have that. What we do have is data showing they were stable on Takhzyro and most of these patients when they switch to ORLADEYO kind of maintain that same level of control once they switch over to ORLADEYO. That's what's really important. Got it. Okay. Thanks for taking the questions. Thank you. Our next question comes from Chris Raymond with Piper Sandler. Your line is now open. Hey, thanks for taking the question. Also a question on BCX9930 or a couple of them, if I may ask. So I guess I just wanna understand the patients that were treated at the 400 mg BID dose. Can you just clarify and specify have you not seen any creatinine level elevation at that dose level? I guess what I'm trying to understand is, you know, and I guess this is probably something for your discussions with FDA, but what's the level of evidence, again, you guys have that you're not gonna see that, the same issue, you know, after longer term treatment at that dose level? And then, Yeah. Oh, I'm sorry. Also, in the extension patients, you mentioned 40% had that CR level increases. When did that start to show up? What was the trigger, I guess, for actually seeing that effect? Bill, it might be helpful to describe the proof of concept study that, you know, how we escalated, got to 400 mg, then went to 500 mg. I think that might be helpful for the first part of his question. Sure. The study was designed so that patients started at a lower dose. Right at the beginning, that was 50 mg. Those few patients stepped through increased doses at 100 mg, 200 mg, and 400 mg. At that period, you know, we did the PK/PD modeling, and we had experience at 500 mg and higher doses in our healthy subjects. We put all that together and decided to move forward with the 500-mg dose level in the pivotals. All of those patients were then moved to 500 mg. The period of time that people were on 400 mg varies. In some people it was quite substantial. All of the observations of increased serum creatinine, as I mentioned earlier, were only seen in the 500 milligram dose period. Does that clarify the question for you? Yes. Yeah. Thank you. His second question was around the extension and the 40% and the slower rise. Yeah. You know, it's after many months of 500 mg on average. I think that another part of your question was what level are we talking about? We're talking about any level above the upper normal. When did you first see that effect in the extension patients? After quite a long period on drug, but it can, you know, within several months on average at 500 mg. Thank you. You know, there are two patterns here, as I mentioned in my remarks. There's this early onset pattern that we saw in the REDEEM studies in those three subjects, and there's this later, more mild to moderate pattern that we saw in the long-term extension. Both of those observations are confined to the 500 mg dose level. Thank you. Thank you. Our next question comes from Jessica Fye with J.P. Morgan. Your line is now open. Hi. Good morning, guys. This is Daniel for Jessica. Thanks for taking our question. First, was the duration of dosing similar between the two patients who discontinued treatment and the one patient who still continues on BCX9930 in REDEEM? That is, could that patient get any worse with continued dosing? The second question is, can you maybe give us more. Sorry, I'll follow up after the first question. Okay. Hi, Daniel. No, all three subjects who had the early onset rises in creatinine are doing better, and creatinine is falling now. The one patient who had continued dosing with BCX9930, it's come way back down. The duration of treatment in all is similar, you know, prior to the onset of these events. This was early in treatment. Okay. Got it. I guess one more question on ORLADEYO. Can you give us maybe more color on the persistency difference seen between those who are reimbursed versus free, those who are on free drug? What could be driving that difference? It's a good question. It's something we're digging into. I think one of the things is that the reimbursed patients are most likely to be, you know, good HAE patients who meet clinical criteria for reimbursement. That's analogous to the stable Takhzyro and HAEGARDA patients that I was describing. The other thing is that reimbursement is always a stressor. It's a worry that patients and physicians have. As much as we try to help them and make them comfortable through that process, if the payer is not paying, it is something that can lead to stress. Stress can cause attacks. Stress can cause people to seek other options. What we're really pleased about is how well we're getting patients onto reimbursement. What that's leading to is, you know, launch to date, about two-thirds of the patients who started on ORLADEYO are still on ORLADEYO. We're building this really stable base of patients who are doing great, and that's what's gonna drive us to 2,000 patients. I think the other piece, Daniel, this is patients early in the process, and that's where we're seeing the bulk of the discontinuation like Charlie described. It's if you stay on longer, the chances are you're gonna stay on the drug. That's another factor that plays into this. Does that mean the patients on free drug don't stay that long? I'm sorry, never mind. I got it. If I could add one more question on 99-30. If FDA doesn't allow for resumption of the trials with amended protocol, what are the potential paths forwards for the program? Is there a backup molecule that you can possibly develop? If so, what stage is it currently at? Thank you very much. Yeah, we're still in the investigation stage, and so can't comment on any other paths at this point in time. You can imagine that we're continuing to look and see if there are other paths to pursue. We're always working on backups. You saw that with avoralstat and ORLADEYO with HAE, you know, and in Factor D in the complement area, we're doing the same thing. They're earlier, and when we're ready to talk about them, we will. We're always working on backups. Great. Thank you. You're welcome. Thank you. Our next question comes from Tazeen Ahmad with Bank of America. Your line is now open. Yeah. Hi, good morning. This is Avi for Tazeen. Just one quick question on BCX9930. So if you move to 400 mg dose, what do you think are the implications for the efficacy profile? And then, if you have not experienced and not observed any, you know, increase in serum creatinine, below 500 mg, why not just move to 400 mg versus taking the stepped approach? And then on the stepped approach, like over what time do you plan to, like, move up to 400 mg dose? I think his first question, Bill, is why did we move beyond 400 mg in the proof of concept, and then why did we choose that as the dose for the pivotals? You know, on the first point, at the time we designed the pivotal studies, you know, we wanted to try to give patients an opportunity to avoid breakthrough hemolysis in the event of sequential missed doses. You know, that was a theoretical concern. At that time, we couldn't distinguish the safety profile of 400 mg and 500 mg or the efficacy profile. We thought that was a reasonable choice. You know, with regard to the other aspect of this on efficacy, I have no qualms about stepping back to 400 mg in terms of efficacy. There's, you know, very good evidence that from the proof of concept study that that's a fine dose from the perspective of increasing the hemoglobin and the clone size and controlling hemolysis and so on. You know, that was the decision at that point. Now we have new information, and it makes sense to propose an alternative dosing strategy consisting of step-up dosing and limiting the dose. The reason for the step-up dosing is because none of the patients in the proof of concept study had early onset rises in creatinine, and all of the patients in the proof of concept study started at a lower dose and then had a step up in dose. You know, there are other drugs out there on the market where starting at a lower dose avoids early side effects. You know, that's a reasonable plausible hypothesis as a way to move forward. You know, we'll discuss that with regulators after we complete our investigation and see whether there's a path forward or not. All right. Thank you so much. Thank you. Our next question comes from Serge Belanger with Needham. Your line is now open. Hi, good morning. Thanks for taking my questions. First one on BCX9930. Can you just describe your FDA interaction since the study was paused and I guess when the FDA issued their partial clinical hold? I believe you mentioned you're planning to have discussions at the end of the third quarter. Seems like a long time to wait. Is that a FDA scheduling limitation or additional work needs to be done before this meeting? No. We were informed a few weeks ago, and we had already communicated that we put a pause on enrollment and that we'd continue dosing in patients that were receiving a benefit from the drug and there was no alternative, which is consistent with the partial hold that the FDA had placed. We knew that we had an upcoming earnings call, and we were in the thick investigation, and we thought it was better to have all the information shared at once so that you could have the context. That was the decision. Jon, I think he asked a question too about like the timing between now and when we go back to the FDA. Yeah. That's a hard one to predict. We said, you know, by the end of the third quarter, we'd be able to get there. Obviously, you can imagine we wanna work as quickly as we can to get a proposal in front of them, and then there's a clock that goes, and so we'll go through that process. If we get, you know, on the first time, there may be a second go at that and maybe a meeting, all that stuff. We'll see how that unfolds. We think that it can happen by the end of the third quarter. Okay. Just one for Charlie on ORLADEYO. I think you mentioned there were some challenges with prior auths in the first quarter. Just curious if those were the results of the usual reset of deductibles or there was something else impacting those prior auths and if they've been resolved. Thanks. No, it was the expected stuff, Serge. It's, you know, there's always a bowl list that happens in the first quarter as payers kind of do the annual reset. It was what we expected, and I think Jon mentioned in his comments. It was patients stepping back to free product during the PA process. It's Medicare donut hole, and then commercial deductibles are always higher until those are exhausted early in the first quarter. Thank you. Thank you. Our next question comes from Gena Wang with Barclays. Your line is now open. Thank you for taking my questions. I also have two questions. One is regarding BCX9930. Just wondering if FDA allow you to resume and under, you know, the lower dose or stepping up dose titration protocol. Do you need to revisit your clinical trial design and expand the number of patients in order to reach, you know, the assumption of a clinical benefit to reach statistical significance? And my second question is regarding ORLADEYO. For the patient naive or switch from on demand, could you give a breakdown of patients that prescribed by community doctors versus academic doctors? And what is the attack rate when they switch to ORLADEYO? Yeah. The first question about what do you do to the protocol? If you're changing the dose, you know, that's definitely a major amendment, and so we'd make that. You know, I can't tell you exactly the other things they'll change 'cause we haven't had those conversations, but I think it would be largely the same study. We think that the efficacy of 400 mg is similar to 500 mg, and so powering and things like that, at least at this point, we don't think we need to change. You know, we'll have more information once we talk to the regulators. Gena, on your question on acute only patients who are switching to ORLADEYO, and that's consistently since launch been a little less than half the patients coming to ORLADEYO. From an overall attack rate perspective, you know, those patients are doing well also when they switch to ORLADEYO and are staying on therapy similarly to what I described with the patients switching from prophylaxis. As far as who's prescribing to those, you know, the acute-only portion of the market has been shrinking, and that's pretty consistent across the board. There'll be some doctors here and there, you know, that might prescribe more, but I wouldn't describe it as an academic versus community. I would say overall, most patients these days are on prophylaxis, and you know, that prophylaxis market continues to shrink as patients switch to ORLADEYO and other prophylaxis products. The acute market shrinks. Sorry, the market is shrinking. Thank you. Sorry, just wondering the acute, you know, the attack rate when they switch, you know, if you're giving a, you know, rough estimate regarding annualized attack rate, usually what is the range of those patients? I wanna refer to the 96-week data where they had, what? An average of three attacks or so per month, and they got down to a half attack per month. I mean, that's probably the best information we can give you. That's right. These patients, what we're seeing is they're, you know, most of these patients are gaining very good control on ORLADEYO, which is the key point. Yeah. I think the other point that Charlie made, the median attack rate in, what? 16 out of the last 17 months was zero. So a lot of people are really controlled. Okay. Thank you. You're welcome. Thank you. Our next question comes from Brian Abrahams with RBC. Your line is now open. Hey. Good morning. Thanks for taking my questions and appreciate all the detail both on ORLADEYO and BCX9930. On BCX9930, if the FDA green lights titration, the titration design to 400 mg, would you still be fully investing in this drug in the same way as you did before, including incorporating patients with renal diseases in that study? Or would there be some sort of more gated investment or perhaps a more focused on certain disease areas or subpopulations or more refractory patients? For Charlie, I'm just curious if during the first quarter there was any impact of the Omicron wave on either switching or new patient starts or discontinuation dynamics and anything we might expect to see with respect to that evolving over the course of the rest of the year? Thanks. Yes. I'll take the first one, Brian. You know, we're not intending to just invest in PNH, and that's the only population we go after. If the drug proves to be safe and effective at a 400 mg dose twice a day, we'll be going into every indication that we can get into. I can't give you the timing on that at this point in time 'cause there's discussions with regulators and all the other things that we need to do. It would be to go broad if we can determine that it's a safe and effective dose. Brian, your question on Q1 with Omicron. Honestly, hard to say. What I can say is Our new patient starts were good for the quarter. They were slightly slower earlier in the quarter, but we ended the quarter at the same rate that we saw in the second half of last year, so really good momentum. Was Omicron a part of that? You know, it's as we've said before, it's something that we've been operating with COVID all the way through. So I'm not gonna pin anything specifically on Omicron. We're happy with our pace right now. Understood. Thanks so much. Thank you. Our next question comes from Liisa Bayko with Evercore. Your line is now open. Hi. Thanks for taking my question, and also thanks for all the color. Just to start with BCX9930, just to follow up on what Brian was saying, do you have any particular concerns about, you know, the idea of moving into renal diseases, just given the serum creatinine? And would we expect some sort of different, you know, outcome in that group, maybe lower dosing, perhaps? You know, Hi, Lisa, it's Bill. Thanks for the question. I think this PNH is a complicated disease. Every patient with PNH has subclinical kidney effects from their PNH because of hemoglobinuria when they're not treated, getting hemosiderin effects on the renal tubules, whether or not you can see that in any of your clinical chemistry or urinalysis tests. It's not like they have pristine kidneys to begin with. They don't. You know, I think that, you know, I don't know the answer to your question. That's gonna be an outcome of discussions with regulators and, experts and ultimately patients and committees and all the rest of it. What I can tell you is that in the interactions we've had with our nephrology expert advisors through the investigation, when I've asked exactly the same question of them, their response is, "We need complement inhibitors to treat people with no treatments with these diseases, complement-mediated diseases who currently have no treatments. You need to complete your investigation, and let's see if we can move forward." That's not the end of the story, but it gives you an idea of what's in the mind of the experts who treat these diseases. I think that theme of the feedback that we got too is really important for everyone to understand. There is a real support in the community to continue moving BCX9930 forward. Obviously we're gonna do it safely and thoughtfully, but you know, I'm pleased to see the enthusiasm that investigators, key opinion leaders and others have shown around this molecule. Okay, that's helpful feedback. Then can you just describe the step up to 400 protocol that you're considering? You know, what doses would you start at? How long would it take to get to 400 mg? You know, in the proof-of-concept study, you know, it took a very time. I think that, you know, we need to step through the regulatory discussions first, before we can be certain about exactly how that goes. On the basis of the data we currently have, you know, there's flexibility in what might be the approach there, so let's see how that goes. Okay. Just finally for ORLADEYO, your guidance of $1 billion, do you factor in any, you know, potential competition from other oral kallikrein inhibitors that are in various stages of development? Do you have an ongoing effort there? It just seems like you've created a really nice market here and wondering if you have some lifecycle management plans. Thanks. Yeah, no, we definitely consider future competition and the timing of which, you know, is some years out from now. But here's how we get there mathematically, right? It's 2,000 patients out of the 7,500. Charlie told you that's between 25% and 30% market share. There's still a lot of market share held by others, and I think the other piece is, if you're controlled on one capsule once a day, why would you switch? What incremental benefit would you see that would cause you to switch? I mean, we've gotten really smart about what goes on in the minds of patients and doctors. We've done a ton of market research, and we can't find a reason. It's not efficacy 'cause they're controlled, and it can't be convenience 'cause you can't get better than one capsule once a day. We just find it really difficult for people to take share away from us. Now, they may get share from other injectables that, you know, people that weren't controlled on oral ORLADEYO, that could be a spot, and there's room for that. We think it's a very realistic number. What about your lifecycle management plans? Yeah, I mean, we're always looking at things to, you know. Obviously, we've invested in a meaningful way in HAE, but we also are building a pipeline beyond HAE with complement and the like. We've got a really long patent life with ORLADEYO as well. You know, our focus right now is to get to peak as fast as we can and, you know, lock in those patients that are well controlled and tolerate the drug and then, you know, continue to advance our pipeline. Okay. It seems like is it really difficult to develop oral kallikrein inhibitors? Is that what I'm hearing? Cause it seems like, you know, without 100% relief of attacks in a clinical trial, not I know in real life the patients who stay on, but in a clinical trial, there's still room to have an even better molecule. Just wondering if that's something that you're working on, or is it just so difficult? I mean, we haven't seen a lot of progress on this front. Yeah. Just one thing I wanna correct you on, and I agree that the pivotal study results are the pivotal study results, but what we're seeing in the real world is people are really well-controlled, right? Doesn't work for everybody, but the ones that it works for, they're really, really well-controlled. This is not I'm sacrificing efficacy for convenience. No way. So I think that's incredibly important to remember. I forgot the other part of your question. No, I guess the difficulty in. Yeah. Oh, yeah. I mean, you know, I won't use an expletive, but yeah, it's hard. Really hard. As evidenced by the fact that we're the only one who's come up with a once-a-day, and others tried, right? You know, as we know in this industry, it's tough to come up with drugs, period, and it's tough to come up with drugs for hard targets. Nobody's come up with a once-a-day oral kallikrein inhibitor to this point. Yes, it's extremely hard, and the attrition rate is high. Just a last question from me. I noticed you got a designation for your FOP program. Are you making any investments there? How are you thinking about next steps? Thanks. Yeah, we are. We're really excited to get that designation. You know, our goal is to get in patients next year. We're continuing to move that program. It's a horrible disease without really any real treatments right now. We're starting to get to know the community, the patient community, the doctors who treat. Yes, we're going full speed on that and hope to be in patients next year. Thanks, Jon. Thank you. Thank you. Your final question comes from Justin Kim with Oppenheimer. Your line is now open. Hi. Yeah, good morning. Just maybe a quick one from me. Didn't really see much sort of mention around experience in the RENEW population. You know, just curious, is there a substantial enrollment there that, you know, there will be a crude clinical experience or, you know. Just kinda curious, you know, how you will get the evidence to gain confidence in treating this population. Yeah. We just got started in enrollment in that trial, so it wasn't a substantial number of patients. It was very few. You know, I think Bill talked about the process that we'd use in evaluating nephritis diseases, complement-mediated diseases. You know, we've got some more work to do, but again, if you have a safe and effective drug and you find the dose, then you can go into you know many different indications, and that's the goal. Okay. Got it. Thanks. Thank you. This concludes today's Q&A session. I would now like to turn the call back over to Jon Stonehouse for closing remarks. Yeah. Thank you. I'm just gonna restate something I said earlier, which is if you take a step back and you look at our company, you see a company with a highly innovative once-a-day oral kallikrein inhibitor called ORLADEYO that's on its way to $250 million, no less than $250 million this year and $1 billion at peak. What's the value of that? The second is we've got a pipeline. Yeah, we face some challenges. You know, what biotech companies have you seen that don't face challenges along the way? But we're still really excited about being able to bring more and more products to the market for patients suffering from rare diseases. What's the value of that? We have a platform where all this came from, right? Discovery engine that can repeat it over and over and over again. What's the value of that? Lastly, we have a strong balance sheet, really strong balance sheet, and we're bringing in revenue at the same time. What's the value of that? When you step back, my answer to that is there's a lot of value here today, and there's even the potential for even greater value in the future. We're gonna keep plowing ahead, you know, tackling these challenges as we face them, driving ORLADEYO sales towards $1 billion, and we remain very confident that we have what it'll take to build one of the next great biotech companies. Thanks for your interest, and have a great day. This concludes today's conference call. Thank you for participating. You may now disconnect.