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Operator
Ladies and gentlemen, thank you for standing by, and welcome to the BioCryst Fourth Quarter 2020 Earnings Call. (Operator Instructions) Please be advised that today's conference is being recorded. (Operator Instructions) I would now like to hand the conference over to your speaker today, Mr. John Bluth with BioCryst. You may begin.
John D. Bluth - SVP of IR & Corporate Communications
Thanks, Daphne. Good morning, and welcome to BioCryst Fourth Quarter 2020 Corporate Update and Financial Results Conference Call. Today's press release is available on our website. Participating with me today are CEO, Jon Stonehouse; CFO, Anthony Doyle; Chief Medical Officer, Dr. Bill Sheridan; Chief Business Officer, Megan Sniecinski; and Chief Commercial Officer, Charlie Gayer. 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, unaudited 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. You should 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.
Jon P. Stonehouse - CEO, President & Director
Thanks, John. Good morning to all of you, and thanks for joining us. Meaningful value is created by companies that translate great science into clinical benefit, leading to approvals and successful market launches of new medicines that patients are waiting for. And the most successful biotech companies are able to repeat this process of discovery, development and commercialization across multiple drugs in multiple disease areas. Building this capability doesn't happen overnight. But when you make this transformation, you see real change and real value. That transformation is happening right now at BioCryst. We know patients with rare diseases are waiting for oral treatments despite having injectable therapy to manage their disease. We've heard that for years in HAE and are hearing the same thing in PNH.
We have built an exceptional drug discovery platform to go after challenging targets like kallikrein inhibitors, Factor D inhibitors and ALK-2 inhibitors. So that we can take this great science, get drug approvals and finally, to the market to put an end to the patient's waiting. The approval of or Orladeyo in the U.S. and Japan is evidence of this change.
Charlie and Megan will describe what we are doing and what we are hearing from customers in the marketplace. And while it's early days in the U.S. launch, they will share why we believe we're off to a good start. Megan will then share with you the even bigger unmet need in Japan for patients suffering from HAE and how Orladeyo can have a big impact as the first approved treatment for preventing attacks. We believe Orladeyo has the potential to generate north of $500 million in global peak sales. Next up is European approval. We expect that approval in Q2, and Charlie will describe how his team in Europe has been preparing for the launch, so we can hit the ground running just like we have in the U.S.
We also have an increasing body of evidence that we can repeat the success and complement-mediated diseases with our oral Factor D inhibitor. Last year, we shared proof-of-concept data in 4 PNH patients treated with BCX9930. Bill will update you on the progress of the study and what to expect when we announced the data from a full set of 16 patients, including both treatment-naive patients and C5 inadequate responders. What makes our oral Factor D program even more valuable and exciting, is we plan to go after many complement-mediated rare diseases. Having one molecule to go after many indications could enable us to have several different approvals for many more patients.
And finally, you can see the change in our balance sheet. As you will hear from Anthony, capital from our December financing has transformed our company and allows us to put our head down to successfully launch Orladeyo around the world and rapidly advance our pipeline. So this transformation is no longer aspirational. It's happening right now, and we're focused on going fast because we know patients are waiting.
Now I'll turn the call over to Charlie to share early insights into our launch. Charlie?
Charles K. Gayer - Senior VP & Chief Commercial Officer
Thanks, Jon. We invested early to be ready for a fast launch to get patients on therapy quickly and to secure reimbursement access for Orladeyo. What we are seeing so far is very encouraging. We are wrapping up clinical trial conversions, and the great majority of these patients are choosing to continue with Orladeyo. We are also seeing strong early demand from new patients. So far, patients on therapy are equally split between clinical conversions and those new to Orladeyo. And our sales and marketing efforts are filling the funnel quickly. What's notable is we are also seeing as many new patients switching to Orladeyo from injectable prophy products as those starting prophy on Orladeyo after previously treating their HAE with only acute medications. This is right in line with our strategies because we believe Orladeyo offers significant and sustained attack reduction with a reduced burden of treatment regardless of a patient's background therapy or attack rate.
More early evidence that we're off to a good start in addressing the strong pent-up demand is that HAE treaters are embracing Orladeyo. We have significantly expanded the prescriber base beyond those involved in the APeX clinical trials. Once patients decide to switch to Orladeyo, our Empower patient services team works with them to get started on product right away. So far, most are starting on our quick start program, while empower helps them through the prior authorization process. Reimbursement approvals are coming mostly through medical exceptions at this stage. But our market access team is making significant progress as payers see the strong demand from patients. Payers are starting to add Orladeyo to their coverage policies, and we expect this process to accelerate over the next quarter.
We knew that COVID would require some adjustments, and we were -- and we prepared to launch in this environment. Face-to-face meetings with customers have been limited in many areas of the country, but physicians have been receptive to Zoom calls because they want to learn about Orladeyo. Our team has been very efficient with these interactions by transferring calls directly to colleagues when market access or medical questions come up. Live meetings and congresses are not quite the same in a virtual format, but we've seen a lot of interest in our virtual education events for health care providers and patients. For example, over 200 patients attended 2 virtual events earlier this month.
We also see that physicians and their patients are communicating via telemedicine when in-person visits are not possible. And many physicians have been comfortable prescribing Orladeyo remotely because starting an oral medicine does not require training. Our U.S. launch is off to a strong start in meeting the pent-up demand from patients in HAE treaters. Looking forward to Europe, our market research tells us there is also significant pent-up demand for the first targeted oral treatment. The difference in Europe is that prophy use has been limited by lack of options. So we have a great opportunity to grow the prophy market with Orladeyo.
Just as we did in the U.S., we have built a team with deep rare disease experience and passion for launching innovative drugs. Germany will be our first commercial launch in Q2, and we look forward to reporting on multiple global launches in the coming quarters.
Now I'll pass it to Megan to provide more color on how we are starting to change the HAE treatment paradigm and to describe launch preparations in Japan.
Megan T. Sniecinski - Senior VP & Chief Business Officer
Thanks, Charlie. Medical affairs is partnering closely with Charlie's team to support a successful launch. Our efforts are aimed at increasing physician knowledge and understanding of Orladeyo. Overall, health care providers are embracing the strength of our clinical data and product profile. In particular, the comparisons of how patients do before and wall on treatment, like the mean attack reduction from a baseline of 3 per month to 1 per month sustained over time, and the attack-free periods many patients are experiencing in our longer-term safety study.
We continue to generate additional supportive data, including what we'll share at (inaudible), which starts tomorrow. We'll show the positive outcomes of attack reductions and less on demand use regardless of prior prophylactic experience or baseline attack frequency. This adds to the body of evidence, helping physicians and patients understand the breadth of experience and improved outcomes while on Orladeyo, including from patients who've been on other props before.
Our medical strategy is also focused on the shift towards individualized treatment plans that best meet the needs of patients with respect to reducing both disease and treatment burden. The recent publication from Dr. Banerji at Mass General, outlining a model for shared decision-making in HAE is evidence of this movement in the field. In addition, our burden of treatment data is resonating. Physicians acknowledge injection fatigue and needle phobia is real. Breakthrough attacks still occur while on other prophys, and patients and caregivers want a treatment that is easier to administer. Our research shows patients want more than only attack reductions. This is why it's so important for physicians to ask about each patient's needs, even if they believe the attacks are under control.
Our work is helping physicians see how Orladeyo offers patients both the attack control they desire and the lifestyle freedom and benefits of a convenient, more discrete oral once-daily pill. As Charlie mentioned, with us seeing a balance of switch patients from injectable prophy products and those previously only on acute therapy, we are making early progress in shifting the paradigm.
Jon shared how we're supporting multiple launches globally. We were thrilled to receive MHLW approval last month, marking Orladeyo's historic milestone as the first approved prophy therapy in Japan. We chose Torii, our commercial partner, given their performance in building the HIV market. They proved they could increase disease awareness and patient identification to grow their HIV business into a $200 million franchise. As a reminder, only about 500 HAE patients are identified today with (inaudible) upwards of 2,500. With Orladeyo, Torii has the opportunity to apply their past experience to build the prophylactic market, driving patient identification and prophy adoption similar to what we've seen in the U.S. over the last decade with the introductions of new HAE therapies.
With approval, Torii's medical representatives are now able to meet with physicians, they're hearing interest and excitement from physicians who see Orladeyo as a major advancement in care for their patients. Our NHI pricing discussions are in progress, and we expect to complete them in early Q2. After price listing, doctors can begin prescribing, and Torii's full launch promotion and marketing activities will kick off. Upon successful completion of the pricing discussion, we received a $15 million milestone, and we share in Torii's success with a tiered royalty from 20% to 40% of net sales. In addition to the commercial launches, we're equally focused on advancing our Factor D program and pipeline.
I'll turn the call over to Bill for more on our clinical progress.
William P. Sheridan - Chief Medical Officer & Senior VP
Thanks, Megan, and good morning, everyone. Our BCX9930 development program is making excellent progress, and we are excited to advance this novel Factor D inhibitor into advanced development trials across multiple indications in 2021. We're looking forward to a big year. Our overall goal in development of 9930 is very clear to bring forward an oral monotherapy complement inhibitor treatment for both PNH and additional rare, serious and potentially life-threatening diseases driven by the alternative pathway. Inhibiting Factor D in PNH is important for patients, no matter their prior experience with C5 inhibitors. So our gold clinical program is to support a label for monotherapy treatment in all PNH patients. This needs PNH patients who are naive to C5 inhibitors, patients who have had an inadequate response to C5 inhibitors and patients doing well medically, but who want to eliminate the burden of therapy from injections or infusions. In 2020, we shared data from 4 C5 inhibitor-naive patients treated with 9930 monotherapy with doses escalated through 400 milligrams twice a day. This data showed that control of hemolysis is dose-related and that the safety profile was excellent. We have since completed enrollment in the study with a total of 16 PNH patients, tender treatment naive who received 9930 as monotherapy and 6 were patients with inadequate responses to C5 inhibitors, who received 9930 in addition to their C5 inhibitor treatment.
At our upcoming R&D date, we look forward to sharing the results of the complete Phase I dose-ranging trial in PNH.
Here's what we plan to have in the data readout. First, we will have data from all 16 PNH patients. The 10 C5 inhibitor naive and 6 C5 inhibitor inadequate responders through at least 6 weeks of treatment at either 400 milligrams or 500 milligrams BID. And the range of both clinical outcomes and laboratory outcomes including, for example, hemoglobin transfusions, reticular sites, PNH clone sites and LDH and safety data from dosing for up to 48 weeks. At the R&D Day, we'll also share new market research with you from PNH patients. What you'll see will feel very familiar as the insights are very similar to what we saw in HAE patients. There is a tremendous burden of treatment associated with injectables, and these patients want an oral treatment. In 2020, we discussed our plans for dose selection and design considerations for future studies with both U.S. and European regulators. Doses selections for BCX 9930 is based on precedent for PK/PD modeling and responses in PNH. With completion of this PNH study, we will have the information we need to choose the dose for accelerated advanced development programs across all indications, and we believe we will be ready to move straight from Phase I to pivotal trials in PNH. With the upcoming data readout, we will be ready to finalize our study plans and start pivotal trials in PNH and proof-of-concept trial in selected nephritis indications later this year. We'll announce the details of those trials as we start them.
Our strong balance sheet allows us to fully invest in this program. We are very excited by the progress we've made in 2020 and the terrific opportunity we have in 2021 to bring an oral monotherapy closer to approval for seriously all patients who complement median diseases.
I'll now hand the call over to Anthony.
Anthony Doyle - Senior VP & CFO
Thanks, Bill. What a difference a year makes. We ended 2019 with $138 million of cash, and we ended 2020 with $303 million, access to another $75 million and upcoming Orladeyo revenues from the U.S., Japan and Europe. The strengthening of our balance sheet, which takes us into 2023, allows us to focus on creating value for the company and shareholders by investing in areas that will provide maximum efficiency and return.
The main areas that we are investing in continue to be supporting the launch of Orladeyo globally and investing in the development of BCX9930 across multiple indications. While, of course, making sure that we have the infrastructure in place to support the pace of progress that we expect. As the CFO, it's also nice to have significant financial flexibilities and leverage to pull as we move forward. As the launch for Orladeyo continues to progress, we can make strategic and financial adjustments that correlate with the pace of the revenues that are being generated. Our investment in Factor D also continues to evolve and are continuing desires to move quickly and broadly with the investment in this program's development. As I noted, we will also have the option if we need it, to draw down the additional $75 million from our existing credit facility with (inaudible). And as we showed with the financings that we announced in December, we have future opportunities to access capital with our growing portfolio of assets. Because of these many variables, we are not providing specific revenue or operating expense guidance in the launch period for Orladeyo. But based on our expectations for revenue, operating expenses and our option to access the additional $75 million, we believe our current cash runway takes us into 2023. This position of financial strength allows us to focus on execution, to focus on value creation and not on near-term cash needs. That's a new and exciting spot for BioCryst.
Biocryst is transforming and so too is our value proposition. We are a commercial stage rare disease company, and Orladeyo will generate meaningful revenue across multiple regions. With BCX9930, the development team is working on a drug that has huge potential across multiple indications. The team in Birmingham continues to discover our next-generation of medicines for rare diseases, and we are now in a strong financial position to invest in driving value creation across all of these areas.
That's it for our prepared remarks, and we'll now open it up for your questions.
Operator
(Operator Instructions) Your first question comes from the line of Jessica Fye with JPMorgan.
Jessica Macomber Fye - Analyst
I had a few financial questions. First, on Bloomberg Orladeyo consensus for this year is around $35 million. Are you comfortable with that number? Second, how should we think about gross-to-net in the early part of the launch? And could that evolve as you get cover trap? And third, where does formulary coverage stand now? What's your goal for coverage? And when do you expect to achieve it?
Jon P. Stonehouse - CEO, President & Director
All right. Thanks, Jess. I'll take the first one. And Charlie, you can take the next 2. So the consensus, as we said, we're not going to give guidance. Our goal is to meet or beat the expectations of Wall Street, and we're excited to approach the first quarter, give you a first full quarter in the next earnings call. So that's that answer. And you want to take the gross-to-net?
Charles K. Gayer - Senior VP & Chief Commercial Officer
Yes, absolutely. Jess, so as far as gross to net goes, first of all, just a reminder for everyone that Orladeyo has the lowest lack price in the market. And we kind of -- we expect gross-to-net to change over time. As I said in my remarks, early on, we're using the quick start program, and we're getting patients on therapy via medical exception primarily. And so we expect this to -- the gross to net to evolve in the year as we get more policies out there. So we're being conservative in how we look at gross to net for year 1, and we encourage other people to be conservative in your estimates for year 1. As far as coverage, as I mentioned, we're starting to have some early successes with plans, putting Orladeyo onto policy. And we're getting very good feedback from payers in terms of the value proposition of Orladeyo and understanding the patient demand for Orladeyo. So we're really expecting coverage to accelerate this quarter. It's going to be a year-long process for some payers. So it will continue to evolve, but we expect to make a lot of progress in the next quarter.
Jon P. Stonehouse - CEO, President & Director
And Charlie, the other thing you might want to just mention is, in the interim while we're working through negotiating for policy, what are we able to do to get paid?
Charles K. Gayer - Senior VP & Chief Commercial Officer
Yes, so absolutely. So the first thing we're trying to do is make sure the patients get right on therapy right away. And then we're working through medical exception processes with payers, and we've had some early success with that. It's a more labor-intensive process, but it's one that we're working closely with physicians and patients on. And so that's working for many patients.
Jon P. Stonehouse - CEO, President & Director
And we get more leverage, Jess, the more we fill the funnel with new starts. So that's a primary focus of Charlie's team.
Operator
Our next question comes from the line of Brian Cheng with Bank of America.
Lut Ming Cheng - Associate
My first question is on Orladeyo. Can you give me an update on the rate of conversion from your EAP and extension studies to the commercial drug? When do you expect the conversion to fully come fee based on what you're seeing so far? And I have one follow-up.
Charles K. Gayer - Senior VP & Chief Commercial Officer
Sure, Brian. This is Charlie. I'll take that question. So the conversion is just about complete at this point. We set out to make that conversion this quarter. And we're really wrapping that up at this point. And as I mentioned in my remarks, we're seeing the great majority of patients who are on the 2 clinical trials plus our EAP, deciding to continue on Orladeyo in the commercial world.
Jon P. Stonehouse - CEO, President & Director
And Charlie, there's 2 steps in that process, right? There's converting them to commercial drug. And then there's -- they have to go through the same prior authorization in the insurance...
Charles K. Gayer - Senior VP & Chief Commercial Officer
That's right. That's right. So what we worked with the clinical sites is getting the start forms for patients and then they go through the prior authorization. Some of those patients, just like the brand-new ones will go on quick start. And then as I just mentioned, we're working through medical exceptions and ultimately policies for those patients. But we're really encouraged with the progress on the clinical conversions.
Lut Ming Cheng - Associate
Okay. Great. So maybe just one more on 9930. So we'll be getting data with patients getting the high dose at [400] and [500] for at least 6 weeks, next month. Can you remind us that the trial allows the inadequate responders to wean off C5 since using 9930 as an add-on? Is there potential for us to see the impact of patient weaning down C5 while they're on 9930?
Jon P. Stonehouse - CEO, President & Director
Bill, do you want to take that one?
William P. Sheridan - Chief Medical Officer & Senior VP
Sure. Thanks for the question. The protocol dose patients who are inadequate responders to have the C5 inhibitor withdrawn. So we'd like to see everything be stable, it can take quite a while for the hemoglobin to spread out, for example, it takes a long time for the bone marrow to get to a new steady state. So in each individual, there will be that opportunity. It's too soon in the study to see that yet and as possible, we might have that data later this year.
Jon P. Stonehouse - CEO, President & Director
And it's a great question, Brian, because, again, the goal is monotherapy, as Bill said in his prepared remarks.
Operator
Our next question comes from the line of Gena Huang with Barclays.
Unidentified Analyst
This is David for Gena. So I have a couple of questions. The first one is on the -- the PNH 9930 assets. So it seems to me that all of 6 contagions being treated. Is there any new cases of rash and that's being observed? And can you just give us some additional thoughts around the mechanisms of the on-site rash?
Jon P. Stonehouse - CEO, President & Director
Bill, you want to take that?
William P. Sheridan - Chief Medical Officer & Senior VP
Sure. So the -- as we noted last year, we've had some cases of inconsequential rash. And these events disappear as BCX9930 treatment continues, in fact, and as the doses increase on day 16 for the protocol. So we'll update that at the R&D day call with the new data cut that's coming up. It hasn't been an issue. And with regard to mechanism of action, if you look in the literature, and we've done extensive consulting actually, this started way back in the Berotralstat development program when we saw a few similar cases. It's seldom that you actually work these things out for these benign rashes, exactly what the mechanism is. So we don't expect that we'll have laboratory investigations that work out the mechanism exactly that almost never happens.
Jon P. Stonehouse - CEO, President & Director
But the main point is it's benign. It goes away and you can keep dosing up. So in our view, it's really non-consequential.
Unidentified Analyst
Yes, that's really helpful. So another question is around your registrational trial for those 9930. I understand that you're probably going to share some additional color on the R&D Day. I'm just wondering if you can share some initial thoughts around the execution trial? Would it likely be a single-arm trial? Or do you need to have an arm with C5 inhibitor to show some inferiority or superiority?
Jon P. Stonehouse - CEO, President & Director
Bill, you might want to just focus on what's the goal of the label that we're shooting for with the drug and then that can help give them a sense of what we need to study.
William P. Sheridan - Chief Medical Officer & Senior VP
Sure. So just to clarify one thing. At the R&D Day, I won't be going into design a future studies. And when we start studies we'll talk about that later this year. At the R&D Day, we'll go over the data from the ongoing study, which we're very excited about to share with you. And the goal for treatment here is to make our oral drug available for every patient with PNH as a monotherapy. So that means that we'll probably have to do more than one study because there are people who are not currently on C5 inhibitors for various reasons, and there are people who are currently on C5 inhibitors, some of them are not doing so well and having inadequate responses, and some of them are doing okay. But oral drug has powerful attraction that we'd like to be able to cover all the bases. You can have a look at other sponsors studies that are published, and there's a history of control clinical trials in the field. I think that would give you some guidance as to where to stand it up.
Jon P. Stonehouse - CEO, President & Director
I think the most exciting part is we're going from a Phase I study into pivotals. And Bill and his team have done a fantastic job of being creative and getting us to accelerate. That's going fast.
Operator
Your next question comes from the line of Brian Abrahams with RBC Capital Markets.
Unidentified Analyst
This is Steve on for Brian. Though it's early days in the rollout. Can you share whether Orladeyo uptake is even across severity with mild and severe patients equally represented there? And any breakdown on whether new patients are coming from general practitioners or specialists?
Charles K. Gayer - Senior VP & Chief Commercial Officer
Sure. Steve, it's Charlie. As I said in my prepared remarks, the -- we're really pleased with the breakdown of patients thus far, we're getting an equal split with people coming from switching from injectable prophys. And those who are treated with acute-only and then coming over to profit for the first time now that Orladeyo is available. As far as the prophy switches, we can't comments specifically on the severity of those. They were on prophy already, so they're pretty severe. But what our clinical data shows is that regardless of background therapy, regardless of treatment rate, patients across the board do well on Orladeyo.
Jon P. Stonehouse - CEO, President & Director
And then a second question was the doc prescribing as a GP specialty.
Charles K. Gayer - Senior VP & Chief Commercial Officer
Yes. I mean, at this point, this is predominantly a market that's treated by allergists immunologists and we know where those doctors are, and we're really excited because we're moving well beyond the group that did our clinical trials, and we're seeing real uptake in a broadening base of those specialists. Eventually, we'll get some GPs and others too, but right now, we're focusing on the big top treaters.
Jon P. Stonehouse - CEO, President & Director
Yes. Your question is a good one. One of the benefits of COVID is the fact that you're not behind a steering wheel driving to the next clinic or you're not in an airplane. And so diving deeper in the list. I mean, as Charlie said, the initial part of the launch is focused on the high prescribers, but we can work our way through the list over time and doing it remotely or virtually is a real plus.
Operator
(Operator Instructions) And your next question comes from the line of Maury Raycroft with Jefferies.
Maurice Thomas Raycroft - Equity Analyst
Congrats on the progress. My first question was on 9930 data at your R&D Day. I guess, how should we think about hemoglobin variability and the bar for success on hemoglobin measures for the naive and experienced patient populations?
Jon P. Stonehouse - CEO, President & Director
Bill, do you want to take that?
William P. Sheridan - Chief Medical Officer & Senior VP
Sure. Maury, thanks for an interesting question. The leading physician to treat PNH patients have started to think about what are the goals of treatment in the era of introduction of proximal complement of inhibitors into clinical research. And there's a nice publication on that, that talks about grades of benefit. So controlling the transfusions and having people not be dependent on transfusions is a big goal. And to do that, we need to stabilize the hemoglobin, and it's clearly better for people. If their anemia is relieved and their fatigue improves. So I think that's controlling transfusions and having the hemoglobin go up, in that publication early publication as a good starter, there were various metrics included for hemoglobin, including 8 grams, 10 grams and 12 grams per deciliter. So I don't think there is a single magic number is the answer. The goals here are control of transfusions and improve the anemia and improve the symptoms of the disease.
Maurice Thomas Raycroft - Equity Analyst
Got it. Okay. That's helpful. And then on clinical trials back, the estimated enrollment for PNH was relatively high. Just wondering if you can provide any insight into the enrollment rate for the study and remind on rationale for why you didn't add more sites for this?
William P. Sheridan - Chief Medical Officer & Senior VP
Great. So we -- so this was an innovative design that included PNH patients in a Phase I first-in-human study, which started up with healthy subject single ascending dose, healthy subject multiple ascending dose and part 3 the study redesigned in an incredibly flexible way because when we started, we didn't know how many subjects we would need to complete first ranging. So what we did there was have potential for multiple cohorts starting at different doses that we worked out along the way. And we wanted also to study a number of patients with C5 inhibitor inadequate response history and a number with no vestry ever having a seat to C5 inhibitor. So that flexibility was basically -- there wasn't a particular number that we had in mind. We had enough in the trial design that we had a good envelope and we needed no more than 16 to hit our objectives.
Jon P. Stonehouse - CEO, President & Director
Yes. That piece is really important. We always put numbers, so we don't have to add amendments to increase the study size. [16] was plenty to figure out the dose. And the other thing is it's a rare disease. So you don't -- you can't use these patients in the next study. So if you over enroll in early studies, you have a more challenge in recruiting for the later studies.
Maurice Thomas Raycroft - Equity Analyst
Got it. That makes sense. And maybe last quick question. So you've talked about providing clarity on additional indications to pursue with 9930 that you could move directly into Phase II with. It sounds like we could learn more about this at your R&D Day. I guess, just clarifying if that's the case, if we should expect an update on that. And then can you say if you've already reached some alignment with regulators on moving directly into Phase IIs?
Jon P. Stonehouse - CEO, President & Director
Bill, do you want to take that?
William P. Sheridan - Chief Medical Officer & Senior VP
Sure. On the first question with regard to the nephritis implications and other indications. At the R&D Day, we will go over the field. And how exciting it is and what the opportunities might be. We won't be specifying exactly what we're including in our nephritis studies until we stop them because we've seen it's very competitive deals and we don't want to advertise exactly what we're doing before, if that's necessary.
With regard to the second question on interactions with regulators, we had very good interactions last year. And the 2 key topics were how do we pick at those for pivotal trials? And that's based on PK/PD modeling, and we've got alignment on that. And the second was just general design considerations around pivotal studies and moving directly from the Phase I dose-ranging in the pivotal studies, and we've got alignment around those general considerations. So we need to finalize our designs, wrap that up and being later this year, we'll be in a position to start.
Jon P. Stonehouse - CEO, President & Director
This is another efficiency, Maury, in terms of being able to do a dose-ranging study in PNH patients in Phase I and then have the dose to be able to go into other indications. That really accelerates the program.
William P. Sheridan - Chief Medical Officer & Senior VP
That's a key point, right? So Factor D is not the target of mutation in any of these diseases. There's a whole range of different things can happen that disturb the complement this on and activate the alternative pathway all the way from bigger mutations in PNH in bone marrow stem cells to germ line Factor VII mutations and so on. So none of those are mutations in fact to do. So Factor D is just happens to be the enzyme that starts the alternative pathway. And the dose that treats is that equipped to -- if it's expected in PNH, the dose that's adequate effectively and everything else.
Operator
At this time, there are no further questions. And I will now turn the call over to Mr. Stonehouse for concluding remarks.
Jon P. Stonehouse - CEO, President & Director
So first off, let me again thank you for joining us. This is a really exciting time at BioCryst. And so we look forward, first off, to be sharing the 9930 Phase I dose-ranging data with you at our R&D day on March 22. And we also look forward to sharing the first full quarter of Orladeyo sales at our next earnings call. So as I said before, the transformation in this company is happening now. And we hope that we've gotten your interest. And if you like to reach out to us, we're happy to connect with you in the meantime. So thanks again, and have a great day.
Operator
This concludes today's conference call. Thank you for participating, and you may now disconnect.