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Charles Gayer

Thanks, John. The launch trajectory for ORLADEYO has been consistently strong for the past four years, but the first quarter of 2025 was our best yet because of the combination of great demand generation and amazing progress helping patients gain access to therapy.
As we described previously, US patient demand in 2024 matched the first year of the launch. Our team continued this momentum as first quarter new prescriptions slightly exceeded our best quarter from last year.
In addition, our latest patient survey showed that regardless of their current treatment status, the percentage of USHA patients who strongly prefer oral prophylaxis grew to 70%, up from 51% in 2023, as you can see on slide 7 in today's presentation. And HAE treaters are increasingly convinced that ORLADEYO is very effective and convenient for patients based on their individual experience and the rapidly expanding body of real-world evidence that they have seen.
ORLADEYO is becoming their treatment of choice. What really drove Q1 performance though was a 10 percentage point jump in the rate of paid patients in the US over where we ended 2024. We expected that level of improvement to take three years. We did it in four months.
The Inflation Reduction Act drove about two-third of the improvement because the IRA is achieving its intent of helping Medicare patients afford their prescription co-payments. Medicare patients were not only able to afford their ORLADEYO prescriptions, but they were able to do so earlier in the quarter than expected. And we also continue to make great progress among the roughly 60% of ORLADEYO patients who have commercial insurance.
The paid rate in that segment increased to 84% as we further improved our ability to convert patients from long-term free product to paid product. By the end of April, we were nearly through the reauthorization season and approximately 84% of all established patients on ORLADEYO were receiving paid therapy.
That's close to our long-term goal of 85% on the path to $800 million in US revenue, a rate we forecast it would take at least three years to hit. This acceleration and paid rate improvement means a lot more revenue this year, allowing us to increase guidance significantly as John noted.
But it also positions us to capture more ORLADEYO revenue over the next several years as our patient base continues to grow. In other words, we're still on a path to a billion dollars in global revenue in 2029, and the path is now even more profitable.
As we look to the second quarter, our very strong first quarter means that the typical revenue jump in Q2 will still be the largest quarterly increase for the year, but less pronounced than in prior years, in the range of $10 million to $12 million. Slide 5 shows visually how we expect this year to look different.
We anticipate this pattern shift because we captured more revenue opportunity per patient in Q1, so the Q2 increase will move closer to the underlying patient growth trend. I'll provide a bit more color to explain.
As I mentioned earlier, patients move to paid status more quickly than expected in Q1, which means we gave away less free product. Our team also continued to improve growth to net, which in Q1 allowed us to keep it closer to the lower end of our typical range of 15% to 20% when in prior years it was closer to 20% in the first quarter.
We expect growth to net to improve throughout the rest of the year, but more gradually so that the full-year average will be right around 15%. Our great execution to start the year and accelerated ORLADEYO outlook for the rest of 2025 come at an exciting time because our clinical pipeline is nearing important early milestones. The path to another differentiated rare disease product like ORLADEYO could soon be increasingly clear.
I'll turn it over to Helen to describe our progress.

Helen Thackray

Thank you, Charlie. Good morning. Today, I'm pleased to share an update on recent significant milestones for our pipeline programs. First, we've submitted our pediatric NDA for ORLADEYO to FDA, introducing an oral granule formulation for patients aged 2 to 11, with additional filings in Europe, Japan, and Canada also this year.
This would be a significant advance in the treatment of children with HAE as it would be the first targeted oral prophylactic therapy for this age group.
Next, I'm pleased to report that we received authorization to initiate patient enrollment for both of the pipeline programs following ORLADEYO. BCX17725 in Netherton Syndrome and of oral stat in diabetic macular edema, which is an important step on our path to having initial clinical data in patients for both programs by the end of the year.
Today I'll focus on the Netherton Syndrome program in detail and provide more information about the trial design, what we're looking for, and what to expect by the end of the year.
First, I'll describe why we're so excited about the potential for 17725 as a transformative treatment for people living with Netherton's syndrome. This is a devastating illness. Its consequences are very serious and lead to lifelong impacts on health and well-being.
We've heard from patients that the lack of treatment leads them to withdraw from medical care. We recently heard exactly the same feedback from our clinical site investigators. Just as it's been for other rare diseases like HAE, we expect introducing a new potential treatment that could revolutionize care, will attract patients back into the care system and into clinical trials.
We designed 17725 to address the fundamental pathology that causes Netherton Syndrome. Every aspect of which is ultimately caused by a genetically determined lack of an essential skin protein called SPINK5, also known as LEKTI. Normally, this protein stops cells in the outer layer of the skin from prematurely separating from the cells below. It achieves this by controlling the activity of key kallikrein, KLK5, which digests bridging proteins that glue the outer layer of skin cells together.
In Netherton Syndrome, there is no breaking mechanism for this because KLK5 is continuously on, and so skin cells quickly separate and are lost. What that causes is a massive disruption of the essential barrier functions of the skin, which normally keeps warmth and moisture inside and microorganisms outside but not in Netherton Syndrome.
And in addition, KLK5 directly activates the rest of the kallikrein cascade in the skin via KLK7 and KLK14. Through cascading pathologic, inflammatory, and allergic pathways, the effect is magnified down into the deeper skin and tissue layers, ultimately also resulting in systemic inflammatory and atopic effects like asthma and food allergies.
All this stems from one faulty gene, leading to the lack of one protein, SPINK5, the regulator for KLK5. This means KLK 5 is the key pharmacologic target in this disease because it's the pinnacle protein, the one at the very top of the cascade that drives the whole process as we see in slide 13 in today's presentation.
Our scientists engineered 17725 to replace the function of that missing protein in its control of KLK5. So we have tremendous confidence in the target and the pharmacologic approach we are taking based on the significant experience of our scientists and many others who have published their clinical and preclinical work.
A big challenge with a protein therapeutic in this disease is to get enough drug into the epidermis and have it stay put. The epidermis or the outer layer of the skin is where it needs to act. So to give us the best chance of success, our scientists designed this molecule with far greater potency compared to the natural inhibitor and very high affinity or stickiness for KLK5. These features give us the best chance to minimize the dose necessary and make every molecule that finds the target count by binding tightly and blocking KLK5.
Today, we're reporting that the IND has cleared in the US for enrolling patients with Netherton Syndrome into our Phase 1 trial. This clinical trial is set up to tell us quickly whether we've met our objectives and design of the drug. The trial plan is outlined on slide 14.
We're currently dosing healthy volunteers to evaluate basic information on exposure and safety, and we're now identifying sites in both the US and Australia for the patient arm of the study. Patients will be given four weeks of treatment and about two months of continuing evaluation beyond that.
Building on this, we also plan to expand the trial later in the year to evaluate a longer 12-week course of treatment as we learn more about the drug. Cohort size will be small, as we expect to gain a significant amount of information from just a handful of patients and perhaps from every patient.
To best inform the design of future trials and to provide early insights into the therapeutic potential of 17725, we need to understand how the drug behaves in patients living with Netherton Syndrome.
To do this, we'll be looking at drug levels in the epidermis both by using adhesive tape to collect skin epidermal cell samples and with small skin biopsies. We would be thrilled to see the presence of 17725 in those samples and normal levels of skin kallikrein enzymatic activity achieved in patients who have Netherton Syndrome, which would provide a strong signal of the potential for clinical efficacy.
In addition, we'll be looking at clinical impact. If we don't see clinical benefit at a studied dose level and dosing is safe, we intend to progress to higher doses. If we do see clinical benefit, as indicated by improvement in measures such as [itch] score, and physician global assessment of severity will have excellent information to inform dose selection for a future pivotal program and even higher confidence in the opportunity for 17725 to be a truly disease modifying therapy for people living with Netherton syndrome.
Although it's always a challenge to conduct clinical trials in rare diseases, we have plenty of experience with this, and we're very encouraged by the clear enthusiasm for our trial that we heard during our recent clinical site visits. We look forward to sharing our initial phase one trial data in patients with Netherton syndrome by year end.
And now I'll hand the call back to John for a financial review.

Jon Stonehouse

Thanks, Helen. We are exiting the first quarter in a great financial position with stronger than expected revenue growth, increasing full-year revenue guidance, accelerating full-year profitability to this year, and last month we've reduced our outstanding debt.
Well, you can find our detailed first-quarter financials in today's press release. I'd like to draw your attention to a few items.
Total revenue for the quarter came in at $145.5 million, 134.2 million dollars of which came from ORLADEYO. Of that ORLADEYO total revenue, $120.2 million or 89.5% is coming from the US.
Operating expenses, excluding stock-based compensation, were $102.9 million for the quarter, up from $93.6 million in the same quarter last year. This was primarily driven by an increase in commercial expense to support our growing ORLADEYO revenue, our newly launched regions like Spain and Italy, and expanded international operations, including global commercial support activities across finance, HR, IT, and supply chains.
Operating profit for the first quarter of 2025 was $21.2 million and net income was slightly positive. Cash at the end of the quarter was $317 million. As a result of the significant and durable improvements to revenue that Charlie discussed, we are revising our revenue guidance by $45 million to $50 million above our prior guidance. And which represents, as I mentioned before, a 33% to 37% growth over last year.
We now expect non-GAAP operating expense for the year to be $440 million to $450 million a $15 million increase over our prior guidance driven by expenses supporting our commercial growth and an increase in COGS as sales of RAPIVAB increased.
The result of this strong revenue performance combined with our continued focus on disciplined capital allocation is that we now expect to be profitable for the full year on a net income and positive cash flow basis this year. This is one year earlier than we previously planned.
Further, based on this improved financial strength, in April, we made a paydown of $75 million on our debt with Pharmacon and reduced our outstanding debt to $249 million. As a result, we expect to save approximately $23 million in interest payments over the life of the debt net of the early pre-payment penalty.
I am immensely proud of the continued focus of our employees who are delivering meaningful improvements in patients' lives both today and in the future.
Our commercial and support teams are driving access and usage of ORLADEYO, and our R&D team is advancing our pipeline to address challenges in new disease areas where patients are underserved. Financially, we are driving revenue growth and are well on our way to $1 billion at peak, efficiently allocating capital and R&D to create sustainable and long-term revenue growth, accelerating our profitability, and reducing our outstanding debt.
We have never been in a stronger financial position, and I am excited for how this sets us up for a very bright future.
Operator, we are now ready for your questions.

Question and Answer Session

Operator

Thank you. We will now begin the question-and-answer session. (Operator Instructions)
Steven Seedhouse, Cantor.

Steve Seedhouse

Good morning. Thanks so much for taking the question. Just looking ahead to another potential tailwind for Oladale, which is the pediatric launch. Do you have a sense of how many pediatric HAE patients are on Taxyro today in the US, and do you think you'll mainly be switching children?
From Taxiro or can you sort of quantify how many patients maybe just don't want a needle, but would be new starts, opportunities for Orlideo prophylaxis altogether.

Jon Stonehouse

Charlie, you want to take.

Charles Gayer

That one? Sure, we certainly do expect pediatrics to be a tailwind for us. And just as a reminder, any future revenues for pediatrics are not included in our $800 million in the US or billion dollar global peak sales.
To answer your question, I don't know exactly how much, how many patients are on TaxiO. We do think that there are about 500 patients, pediatric patients in the US, and at least 200 of whom could be appropriate for prophylactic therapy. But once an oral is available, we actually think that that could grow. And so I think our where we'll get patients is a mix of those switching from injectable therapies like Taxiro, but we also think that the whole landscape for treating kids under age 12 could change. And that more kids could start prophylaxis at a younger age to prevent attacks and really change the course of their life with the condition and an oral therapy really makes that happen because I would say there's literally no preference for an injectable for children, so we think we'll be very well positioned. We're excited about it.

Jon Stonehouse

Yeah, I would add that when you consider that you can just sprinkle our medicine, the granules, onto some soft food or into a glass of water versus the trauma of sticking a needle into a toddler, we should be the market leader. There's no doubt in doubt in our minds that that's going to be the case, and I think the other thing that Charlie's referenced in the past is this halo effect. We still have some top HAE physicians that haven't, started switching patients and We know they have pediatric patients, and there's no reason for them to not start using our drug for pediatric patients. And when they see how well it works, our expectation is that that's going to expand their usage. So we're really excited about this. We haven't put any hard numbers on it yet publicly, but we're really excited about it.

Steve Seedhouse

Great, just also on DME program, so it looks like you're guiding for data this year. I'd be just curious if you could frame, what you would do as a successful outcome for that 1st read out, given the precedent data, given your, obviously the novel delivery method just.
What are you hoping hoping to see there in the 1st group of patients?

Helen Thackray

Yeah, so we'll have our first patients on drugs, as I said, we have authorization to proceed with enrolling patients in that trial. And what we're looking for is, the obvious safety and tolerability, but more importantly to your question, we're looking for the effect on the thickness of the retina, the edema in the retina. So we'll be able to in those first patients watch over several months of exposure to assess that retinal thickness and whether that is changing.
We do expect it will take a little bit of time to change, but not very long, and I point to some of our A preclinical data that shows that in a VeF dependent model, the use of oral stat as a plasma calliquine inhibitor, has a result on leakage of the vessels very quickly within 6 days. So just to say that a readout that we'll be watching this year will be that retinal edema, retinal thickness, and we'll be observing in the first few patients. By the end of the year.

Jon Stonehouse

Yeah, normally we don't get super excited about sad studies, but this is in patients, and what we've seen in rabbits is that when you give a single dose, you still have a really high concentration out to 6 months. So a single dose of this drug in DME patients could tell us a lot. And so, we're excited to see what we see at the end of the year.

Steve Seedhouse

Thanks so much.

Jon Stonehouse

You're welcome.
Thank you.

Operator

Our next question comes from the line of Maury Raycroft from Jeffreys. Please go ahead.

Maury Raycroft

Hi, good morning. Congrats on the update today and thanks for taking my questions. Wondering if we could just talk more about getting patients onto pay drug and, what you did there that worked better than expected, and should we expect the rate to be maintained or improved upon going forward or what are some of the drivers you're focused on that could cause the rate to decrease again over time?

Charles Gayer

Sure, May, the number one thing that we did, and we've talked about this before, is, we've over the last couple of years made investments in our team to make sure that we're really prepared and really expert in this reauthorization process, and we've gotten better every year, and we knew that there was this potential tailwind with Medicare this year.
We also knew there was more space that we could improve in the in the the very important commercial segment. And so I would just say that the team has just reached a level of excellence that allowed them to execute this year, and we're looking forward to further improvements going forward. What we would expect the rest of this year is that the rate will stay about the same, maybe decrease a little bit, because the rest of the year our paid rate is driven more by new prescriptions as opposed to reauthorizations. But where we ended Q1, where we ended April, becomes the floor for what I would expect in the future, and I'm very confident we'll we'll reach our 85% goal. We'll reach it ahead of when we expected to originally, and we'll be looking to exceed it if we can.

Jon Stonehouse

Yeah, the other thing I'd say is, you should take a look at that slide that Charlie referred to around the pattern of revenue this year. It's different, right? So we pulled forward revenue that would usually be a big bump from 1st quarter to 2nd quarter into the 1st quarter, so you're going to see less of a bump.
I think the other thing though that's exciting is that the underlying growth continues to be really strong and so, that's where we're going to see incremental improvement over the course of the year and we're really excited to share that with you.

Maury Raycroft

Got it. That's helpful. And maybe just as a follow up, if you could just provide more specifics on what you did to improve Gross to that in first quarter and what you're doing to better improve that over the course of the year as well.

Charles Gayer

Yeah, so a couple things, Maury. One big impact was just the fact that we got so many more Medicare patients paid, and that changed the overall gross to net mix. The other thing is the team's just been really focused at every little detail that can make a difference, such as how much co-payment assistance do we give to A commercial patients and we've made some adjustments there that have improved gross to net. So the team is being very disciplined, not just about getting patients paid, helping new patients come on board, but the team is very focused on maximizing the opportunity in all segments and so I'm really pleased that we made that kind of a progress in the first quarter, and I think that will be durable through the rest of the year.

Maury Raycroft

Got it. Okay, thanks for taking my questions.

Operator

Thank you.
The next question comes from Jessica 5 from JP Morgan. Please go ahead.

Jessica Fye

Hey guys, good morning. Thanks for taking the question. I was curious, more specific to the, guidance bump for Orladeo, can you quantify how much of that increase is related to Part redesign and a higher proportion of paid patients through that kind of mechanism versus.
Higher than expected demand versus just execution dealing with the coverage reoffs at the start of the year and second question just with profitability pulled forward here, how does that impact how you think about investing in the business and I guess more specifically could that allow you to accelerate any development plans for your earlier stage pipeline?
Thank you.

Charles Gayer

So I can take the first part of that. As I mentioned in my remarks of the 10% improvement in paid rate, about 2/3 of that was related to the IRA helping patients afford their co-pay. So that's great. But what I'm really excited about is how much progress we made in the 60% of patients who are on commercial. Insurance where we we improved by close to 5% over where we ended last year ending up at 84%. So that that was the other third of that improvement.
Clearly in terms of raising our guidance for the year, that increase in paid rate overall was the number one factor, but we have an underlying patient growth year over year close to 20% and as I mentioned, we had one of our best years ever last year. And in the first quarter we were a little bit better than that and and so that underlying demand is is what's going to drive this brand going forward.
And then John, you want to, yeah, I'll take.

Jon Stonehouse

The profitability. So yeah, it's territory we haven't been in before and are really excited to be in it.
The programs are fully funded already to go as fast as we possibly can, and I'm, I think the teams have done a great job of figuring out how to. Get the programs to move as quickly as possible. And then in terms of what are we investing, I think we gave you a pretty good clue by paying, making a paydown of $75 million of the PharmaCon debt, cleaning up the balance sheet, not having to pay significant amounts of interest over time is something that, we'll continue to look at as cash flow comes into the company.
Operator, I think we can go to the next question.

Operator

Yes, thank you. The next question comes from the line of Brian Abrahams from RBC Capital Markets. Please go ahead.

Brian Abrahams

Hi everyone, this is Nevin on for Brian. Congrats on the quarter and thanks for taking the questions. So just following up from some of the prior questions so.
Given that you're on around 84% pay truck and also that you're on the lower end of your gross to net range for the year, does this potentially indicate that there was a dip in the total, patients that were on or ladeo and like how do you see that kind of evolving into, the rest of the year?

Charles Gayer

Well, I can tell you that there wasn't a dip in patients on oraldi, I'm maybe I'm not quite understanding your question, Nevin. I, we've had extremely consistent demand. So, again, last year we had as many new patient starts as we did in the 1st year of the launch, and then we did a little bit better than that in the first quarter.
The retention rate of patients has also been extremely consistent the last couple of years where anybody who starts on Orladeo, we get about 60% of those patients to stay on therapy through the 1st year and then very few drop off after that. So what we're seeing in patient demand is as strong, if not stronger than we've ever seen it. And then you add on top the paid rate and the improved growth to net. It just means that we're more profitable. And so we still see reaching a billion dollars in 2029, but the path to get there every year with that underlying demand is just going to be more profitable than we previously expected. So it's a great position to be in.

Jon Stonehouse

Yeah, I think Nevin, that I don't know if you're referring to that slide of the pattern of sales, which, because of the fast change in free drug to pay, the pattern's different than previous years, and it'll probably go back to the same pattern as previous years next year, but there is nothing that is slowing down. And you know we're we're we're really excited about the underlying demand and continuing, and there's more patients to get quite frankly. I mean, I think the last update Charlie said is around 3,000 patients.

Charles Gayer

The end of last.

Jon Stonehouse

Year, yeah, and there's 10,000 available, so there's plenty more to get, so no signs of slowing down.
Just a change in pattern.
Got it.

Brian Abrahams

And then I guess on the uptick in patients that you're seeing for preference of for for oral prophylactic, what do you think is kind of driving that underlying dynamic there? Have have rates of maybe needle phobia changed or is it just a convenience factor that's being appreciated more say kind of the, more maturing launch of Orladeo and convenience of that offers.

Charles Gayer

Thanks for that question.
I think what we've known since before launch that fundamentally the great majority of patients prefer oral therapy to injectable, but what's really important to patients is that they get control of their HAE attacks, so they'll never sacrifice efficacy for convenience.
But now 4+ years into the launch, what they're seeing is with all of our efforts is with Orladeo you can have both. You can have great efficacy. You can have convenience. And so the patients have seen it themselves. They've heard from their peers. It's a very connected community within HAE.
And then their their health care providers are just that much more confident, which always is a critical factor that the physicians have confidence in a drug. And so you put all this together with the efforts that we've made from a sales and marketing perspective, it's natural that patients underlying preferences is coming out, and I think that's why we've seen it grow by about 20% over the last couple of years, and I wouldn't be surprised if it continues to grow.

Jon Stonehouse

I think it was around a year ago we told you, Charlie told you that there was a a momentum change and that there was a confidence build up and that was because more and more physicians were having positive experiences with their patients. Patients talk and doctors talk about other patients to their patients, saying, I have a patient that does really well on early day, you might want to consider trying it. And so it's that it's that confidence in the product that I think is reflected in the market research.

Brian Abrahams

Great, thank you all so much and congrats again on the quarter.

Operator

Thank you.
Thank you. The next question comes from Stacey Kuo from TD Covin. Please go ahead.

Stacy Ku

Thanks so much for taking your questions and congratulations on the really impressive quarter. So first, as we think about these, additional patient additions and strong patient demand, you've previously added around 60 prescribers per quarter. What are your expectations for this year? And then some follow ups on another 10.
Are you able to make any disclosures on the phase one early sad mad results? Are you able to disclose anything at this point in time, or, can you narrow the timelines for any updates in other terms?
And then I have a follow up on another time.

Charles Gayer

Okay, I'll start with the the healthcare providers.
The good memory, Stacey.
Last year we actually averaged 61 new healthcare prescribers for Oladeo per quarter.
It was 62 in 2023, and in Q1 we had 59, so it's incredible. Consistency at this stage in the launch that we're still convincing new prescribers. Our team will always go out and find new prescribers. The other thing though is, and John touched on this earlier, but we've made progress in the tier one physician, so 81% of those doctors have now prescribed, and we're seeing more and more physicians become repeat prescribers and even some returning who prescribed some years ago now returning. Now that they better understand the product, so the physician dynamics are excellent along with the overall patient dynamics.

Jon Stonehouse

And then Helen, you might want to talk about how we're thinking about packaging all the data towards the end of the year. Yeah.

Helen Thackray

So in terms of the results on the sad mad Stacey, we've been following that trial. We have its intent with initial safety and PK data. We have the confidence now from that to open the dosing in patients, so you should see that as a sign of generally what we're seeing and then.
What's most important, and we've, I've been clear about looking for the skin outcomes in patients. What's most important is what happens in patients. So we'll bundle it all together.
It'll be by the end of the year. It will have the updates from the healthy volunteer data, but then more importantly, that outcome in patients and are we at the dose that gets to skin healing.

Jon Stonehouse

So in healthy volunteers, no news is good news.

Stacy Ku

Okay, wonderful. Well, I guess that that leads to my then follow up with that another 10, I know you've talked about kind of the early interactions with investigators, in the activation of space, but maybe nuance, part 4 of the phase one study sounds like you're getting at least some sense of safety. Could you broaden the POC and the younger patients, or are you are you mainly staying into adults?
Thank you.

Helen Thackray

So part 4 is the extension of treatment. It is designed so that it's additional patients.
So what we're hearing at the sites, it's we're hearing clear enthusiasm. We're hearing that a that a potent KLK 5 inhibitor that could target at the top of the cascade is something that physicians want to TRY in their patients with Netherton's syndrome. It'll be the first few patients who are on that part 3, and then we're sort of continuing. We'll open part 4 and continue and broaden the enrollment. To get a longer term exposure, I would think of them as sort of going together rather than being separate, and the result is by the end of the year we'll have patients on, we think, both sections with a with a longer term follow up on those who've been dosed in part 3 and then more recent follow up on those dosed in part 4.

Jon Stonehouse

I think one other thing, Stacey, that I'm certainly learning as we learn more about this community and and both the physicians and the patients is there are some significant differences from HAE, right? There's no therapies in place. The organization for advocacy isn't nearly as advanced as HAE was, so those are challenges in finding patients. But the flip side is the hope we're offering these patients is. Off the charts, right? They were hopeless or they have been hopeless and and coping because they have nothing to treat the underlying cause of their disease. And when we start talking to patients and tell them what we're trying to work on, I mean, it brings them to tears and so that's powerful. And so if we can find these patients, and I'm confident we will and and this drug gets to the skin, we've got something really powerful to help them and give them hope.

Stacy Ku

Wonderful thanks so much.

Operator

You're welcome.
Thank you. The next question comes from Gina Wang from Barclays. Please go ahead.
Gina Wang, your line is unmuted. Please proceed with your question.

Gena Wang

Oh thank you for taking my questions. I have two questions. I think that I joined a little bit late so if already discussed and I heard some of the answers if already discussed, I apologize. So for your paid rate truly very impressive, like 10% over 10% increase from the last quarter 73.5% now improved to 84%. Did a comment when you answer numerous questions, answer, various parts, but, can you help us understand like we'll make it like in such a short time that have such a big improvement, can you walk us through the actual process where you did, make it possible in short time. See such a high increase regarding the pay rate. And then the second question is regarding the DME so you will have patient data later this year. Could you give us some benchmark you are looking for that you will consider that will be encouraging to move forward?

Jon Stonehouse

Yeah, hey, Charlie, maybe I'll start first on this first one, and then you can answer the rest. I want to remind everybody that when the Medicare negative thing happened, it snapped the other direction very quickly, like within a quarter. So this is a snap back, but I'll let Charlie explain it in more detail.

Charles Gayer

Yeah, so again, Gina, one thing I explained is about 2/3 of the improvement was was Medicare, and as John said, that was a quick snap back, but it was because our our team prepared and so the snapback is, and I've always said this, that Medicare plans approve Oladeo at the highest rate amongst all insurers that we see. It was just an affordability thing for patients, so it's great that the IRA is helping patients afford, and our paid rate amongst the 20% of Medicare of our patients who are on Medicare is now 89%. So that kind of underlines what I just said about it being the the top segment for approvals. The other piece though is the team really prepared on the commercial side. And one of the preparations is we have all this long term real world evidence. So what we know about the drug and the efficacy today is very different from what we knew 4 years ago. And so the team is able to use that more proactively with payers, and it's convincing more and more payers that this is a very effective drug and therefore they're choosing to pay for it for for the patients. That's where I think we can still make progress, but it's about the data, the preparation, and then also the intended impact of the IRA coming, coming.

Jon Stonehouse

True. The other thing before I turn it over to Helen on the DME is back when patients were struggling to make their co-pay, we made a very conscious decision to give them free drug.
And we kept patients and we actually gained patience as a result of that strategy. So then when the affordability got back to normal, those patients snapped back quickly and I think strategically that was in hindsight, a good move to make. Helen, you want to talk about DME? Yeah.

Helen Thackray

So because we have authorization now to dose in patients, this is a big milestone for this program.
We are looking this year to have exposure and experience with a few patients with that single dose, as John mentioned earlier. This is a drug with long durability of exposure, and we're looking for that the outcome, the retinal edema. A lessening reduction in the size of the retinal thickness. We're looking for that and we'll be looking for that for the end of the year in terms of what then is the benchmark to move forward, we're looking for a really big effect. We're looking for a clear and uncontroversial reduction in edema that would then tell us that we have. Have a dose level that's got the exposure necessary to have that effect. If we don't see that, we will increase the dose so that we'll either see a very, significant reduction in edema and know that we have a dose we can take forward, or we'll not have achieved that yet and we'll expect to increase the dose until we do.

Jon Stonehouse

Yeah, I think we've always said we're looking for signals of activity and starting to get a sense around dose, and that's exactly what Helen said. When you have 3 patients per cohort, there's a limited amount of information that you can get, but I think if we can see some sort of effect and duration of effect that gives us encouragement, nobody else with a Calacrine inhibitor has done that yet, right? And so that would be very exciting for the program.

Gena Wang

So sorry if I can follow up, so how many micron reduction you will consider clear and uncontroversial?

Helen Thackray

I would use the within the literature for what is, generally accepted as something that's going to be predictive of likely responsive visual acuity. I can't give you a number today, but I can tell you we're looking for an uncontroversial difference, so not something that's small.

Gena Wang

Okay, thank you.

Operator

Thank you. Your next question comes from Laura Chico from Red Bush Securities. Please go ahead.

Laura Chico

Good morning. Thanks very much for taking the questions. First one is just going back to the pediatric formulation for Orladeo. Can you just remind us on maybe some of the timelines after a pediatric launch arrives? Would there be a lag in deployment to the channel upon approval, just getting, material out for supply? And then as we're thinking about the cadence about taking a pediatric population versus the adult, just kind of curious what dynamics we should be thinking about that might impact that uptake a little bit differently. So what we've seen in the adults and I have just one quick follow up.

Charles Gayer

Sure, there, we will TRY to make the lag as small as possible.
When we launched capsules back in 2020, it was only 2 weeks from approval to being in the channel.
That was amazing. I don't know if we'll go quite that fast, but we're looking to get it out as quickly as possible. The other thing we'll do is prepare our team. To begin promoting right away and you know that I think that's even more important because it'll take a little time for kids to come in and visit their visit their physicians. The uptake dynamics I alluded to some of this a little bit earlier. I think the biggest difference is that prophylaxis really hasn't been the standard of care for kids under 12. The historical conventional wisdom is that kids become symptomatic mainly around puberty. I think what we saw in our clinical trial is for many of these kids that is very not true. Many of these kids were, in fact, I think the average age of symptoms was was age 2. And so changing the the way that the whole treatment paradigm for children, if you could prevent attacks so that patients could avoid that fear, so parents could avoid that fear, it could really change the course of a of a kid's life living with with HAE. And so I think that'll be The biggest change and as John and I both said earlier, I think an oral formulation is going to be the natural choice for that starting prophylaxis with with the kids. So we'll see how quickly it goes, but we're we're hearing a lot of enthusiasm from both healthcare providers and the patient community. For for the change that I'm describing.

Jon Stonehouse

Yeah, and Laura, I'd add one thing. One of the things we learned with adults is it takes longer than you think.
And so that's why we're not getting out over our skis here on, giving you guidance on the uptake because we just don't know yet. We, we're confident that we will be the market leader because we believe we have a formulation that is way more acceptable to little kids than injectable, but the pattern to get there is, it's just too early to predict.

Laura Chico

Understood. Okay, thank you for that one. And then one quick follow up on another, can you remind us the dosing range you're going to be starting with, for 17,725, and then I just wanted to clarify, I know you mentioned, advancing later to 12 week dosing, but what is the actual trigger for that? Is it dependent on accruing sufficient 4 week data? In the initial cohorts, any clarity there would be helpful.
Thank you. Yeah.

Helen Thackray

Sure.
So in terms of the dosing range, we have experience with a fairly broad dosing range now and healthy volunteers, and we'll be dosing patients somewhere in the middle of that range.
It's 6 mg is the is the dose for patients in that initial part of part 3.
There isn't a trigger so much for the part 4, 12 weeks. It's more that we'll learn about the dose level. We'll learn about whether we see initial effects quickly in part 3, and from that we'll understand if we need to start with the same dose or dose escalate quickly in part 4. It's more that they'll be sort of dosing initially in part 3, learning from that as we initiate part 4, both going in parallel with ongoing observations over time.
So as I said earlier, it's more like a continuous sort of set of two trials, two arms that go together.

Jon Stonehouse

Yeah, and if the drug works, we'll have an ability to keep patients on drugs.

Laura Chico

I see. Okay, thank you guys. Congrats on the quarter.

Jon Stonehouse

Thank you.

Operator

Thank you. The next question comes from Lisa Baker from Evercore ISI. Please go ahead.

Lisa Baker

Hi there. Thanks for taking the question and, congratulations on a strong quarter. Two parts to my question. First is, I just want to make sure I understand that the paid rate, improvement that you saw, you've talked about it kind of being like a switch that flips on. Is there any chance this slips back? Can you talk about the sustainability of, this paid rate improvement? As we head into next year and future years, and then, part two is really, can you talk about the patients on treatment today and then walk us through, the kind of remaining pool of patients out there, at least in the US who have not yet tried or down on your plans to kind of, increase utilization there. Thanks.

Charles Gayer

Sure, thanks, Lisa. The the paid rate, I believe will be very sustainable based on the evidence that we've shown for Oladeo, it's really changing our conversations with payers and so, I think that 84% is kind of our new floors we we look forward over time.
The patients on therapy, so as I mentioned earlier, at the end of last year, 3,000 patients in the US had tried out of a pool of about 10,000.
Launched to date, 52% of our patients have switched from other prophylaxis.
About 30%, just over 30% have switched from acute only, and the remaining 16, 18%, whatever it is, our patients, best we can tell, were naive to therapy. And so that that last piece I'm excited about because what it shows is that this is a market that is still growing. We've known that the market for prophylaxis has been growing over time, but we're finding new patients out there and they're coming to prophylaxis. And so we have at least another 7,000 or so patients who have not yet experienced Orladeo, and many of them will be appropriate for prophylaxis. You combine that with the 70% preference for oral prophylaxis that we we discussed in the call today, and the growing healthcare provider enthusiasm. And the fact that we're getting paid at such a high rate, it just increases confidence overall and I think we'll continue to drive Oladeo going forward.

Jon Stonehouse

Yeah, and if you think about it, if at the end of the 5th year since we got approval, we're at about a third of the patients that have tried it, and we're and we're at $580 to $600 million we are definitely on our path to $1 billion.

Lisa Baker

Okay great thank you so much.

Operator

You're welcome.
Thank you.
The next question comes from Serge Bellinger from Needham and Company. Please go ahead.

Serge Belanger

Hey, good morning and congrats on the 9th quarter. A couple or orlao questions for Charlie. Now that you've reached your, Target for a paid rate of 85%, should we expect continued improvements on that number? Is is there more to do on the commercial or or Medicare side? And then just to follow up on on the patient ad questions, sounds like 12 was one of your best quarters ever in terms of new patient ads. Just curious if you're noticing a trend on. Where these patients are coming from if it's still 50% prophy and 30% acute, or is that next changing with this new batch of new patient ads? Thanks.

Charles Gayer

Sure, thanks, Serge. Yeah, I think you know we're almost to our long term goal of 85%, little more room there, but what we'll do is we'll probably up that number, we'll keep striving to get better. I mentioned just a minute ago that in the Medicare segment that's 20% of our patients, the paid rate is now 89%, and so that shows that we can improve past the 85% and we'll do everything we can to. To to keep getting getting better.
I don't expect another big tailwind like we had this year, but it's just now going to be incremental improvements.
In the first quarter, yeah, fundamentally the patient base was very similar to what we've seen since the beginning of launch. The other thing I'd add is the mix of prescribers that I haven't completely discussed today, but in the first quarter, 55% of the prescriptions were from our top tier of doctors, those physicians that we know treat about 50% of all HAE patients. And then the other 45% came from everyone else. So really balanced across the board. I mentioned earlier we've had 59 new prescribers in the quarter and so we just keep capturing more opportunity and we keep capturing it from all the different segments which gives us that extra confidence in the sustainability of this growth over the next several years.

Jon Stonehouse

Operator, we can go to the next question.

Operator

Perfect, thank you.
Your final question comes from John Wallabin from the Citizens. Please go ahead.

Jon Wolleben

Hey, thanks for taking the questions. Couple on Netherton for me. Can you remind us of your pre-clinical to work that you've completed so far? And then helen, when you talk about seeing a clinical impact determining, dosing higher, what metrics will you be looking at and what what's your bartarily to determine whether or not you you're in a, sufficient spot in terms of efficacy.

Helen Thackray

Yeah, sure. So pretty clinical talks, so this is the biologic. It's protein therapeutic. There's a fairly standard safety profile for protein therapeutics, and we're seeing a very consistent profile with that.
You, I think the other thing to look at with preclinical talks is we have the authorization now to proceed not only in healthy volunteers but also in patients, and that includes authorization in the US and Australia. So just indicative of the The range of confidence coming from the preclinical tox data.

Jon Stonehouse

Yeah, and Helen, I would add we have an open ID and we have the ability to dose in part 3 up to 4 weeks and part 4 up to 12 weeks. So that gives you some sense of the duration of tox and the like.

Helen Thackray

Right? So standard toxicology to support that.
In terms of the clinical impact, so what we're looking for is really normalization of the skin.
So that means we're assessing by how the patient feels about their skin. Is there itch still, and we want to see the itch really go away. We're looking also at a physician assessment of the skin and the severity index for sort of thickening and scaling of the skin. And so we're looking for that redness to go down and for the scaling to stop. I expect that we'll see some of that initially. I expect that it will probably improve over time and if we need to dose up to get to healing, meaning, normal looking skin and patient not reporting itch, then we'll dose up to that.

Jon Wolleben

How many patients per cohort can patients in part 3 be included in part 4? And then how do you think about the time dependent nature of these improvements?

Helen Thackray

So the, it's a small part 3 is smaller than part 4.
We could see what we need to see in single digit patients, so it's going to be fewer than 10 in part 3. Part 4 will be slightly larger, but this is still an ultra rare disease, and every patient will inform whether we're at the dose and seeing what we need. So it'll it'll be larger but not much larger in part 4, maybe even more than 10. In terms of the time dependency, we just don't know. We do know that the, we expect the skin turnover in Netherton syndrome to be about 2 weeks. We do know that we would expect healing to occur as the skin is turning over, so we may be seeing clinical signs. As quickly as you know 4 or 8 weeks in this, we also may be seeing continuing improvement in healing of the skin because the inflammatory components take a little bit longer to heal. But our goal is to see whether we are getting that initial quick result in the, short term for 8 week time frame after end of dosing, and then observe over time as we continue to expand to part 4 and be able to dose patients for a longer period of time.
Super helpful thanks.

Jon Stonehouse

Helen.

Operator

Thank you.
This concludes our question and answer session. I would now like to turn the conference back over to Mr. Stonehouse for closing remarks.

Jon Stonehouse

Thank you. So I mean it was a great quarter. I don't know what else to say, and I am, I'll repeat what I said earlier, I am immensely proud of the employees of BioCrys for delivering the results of this quarter, but count on us to continue to be executing. We're not going to rest on our laurels, there's a lot more to do, a lot more to deliver over the course of the year, and you can count on us for continuing to work as hard as we can to do that. So thank you for your interest, and we'll keep you updated along the way. Have a great day.

Operator

The conference has now concluded.
Thank you for attending today's presentation. You may now disconnect.