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Douglas Ingram

Thank you, Mary. Good afternoon, everyone, and thank you for joining Sarepta Therapeutics First Quarter 2025 Financial Results Conference Call. Across biotech and indeed the market more generally, the first quarter of 2025 has been a challenging one. Likewise, for Sarepta, we have faced challenges that have motivated us to take a more measured view for the remainder of 2025.
Fortunately, Sarepta is in a better position than most of biotech today, as we have a significant number of approved therapies and significant revenue, a strong P&L and balance sheet and the ability to continue to independently drive our portfolio of gene therapies and siRNA programs. we are well positioned to weather this chaotic period.
In the first quarter of 2025, we achieved $612 million in total net product revenue, representing 70% growth over the same quarter last year. Our PMO franchise grew 5%, achieving $237 million for the quarter and ELEVIDYS achieved sales of $375 million in the quarter representing a 180% increase over the same quarter last year. While our ELEVIDYS first quarter growth still represents the most successful in vivo gene therapy launch yet in history. In fact, in Q1, we treated more patients with gene therapy than ever before in the U.S. in a single quarter, we nevertheless fell short of expectations.
In a moment, Dallan will explain some of those quarterly factors including administrative issues, a severe flu season that resulted in delays in the effect of the recently reported safety event that motivated some families with scheduled infusions to pause for additional information.
Looking forward, we are changing our net product revenue guidance for the year to $2.3 billion to $2.6 billion across our 4 approved therapies. This change is driven by 3 factors: First, as you know, we recently reported that a boy infused with ELEVIDYS suffered an acute liver failure and passed away. This was an unimaginably tragic event for that family who with ELEVIDYS finally had reason to hope for a brighter future for their son. At Sarepta, we are deeply committed to the patients we serve. So this event, so markedly different than all other experience with ELEVIDYS was heartbreaking for all of us.
While it is of no comfort to the family involved, it's important to remember that more than 800 patients have been infused with ELEVIDYS. The outcome of this event is inconsistent with all other experience with ELEVIDYS and we are continuing to explore what was uniquely different about this case than every of the other hundreds and hundreds of infusions that have occurred to date. What we do know is that while this young man's outcome was surprised, this did not represent a new safety signal for AAV-mediated gene therapy generally or ELEVIDYS more specifically nor did it change the positive risk benefit of ELEVIDYS, which has had a stable and laudable safety profile in the context of AAV-mediated gene therapy since first being infused back in January of 2018.
And of course, to support optimal outcomes, we have always prioritized patient safety. We have proactively placed significant monitoring requirements in our label. We require all sites to complete training before being permitted to treat and we have a never before seen or executed program, One called Sarepta Exchange that provides physicians with near real-time access to the most experienced and leading experts around the world so that outcomes are consistent across the country. We also provide education for our patient community, and we are committed to providing timely information about this life enhancing therapy.
What we have observed is that top thought leaders who understand the data have not changed their treatment approach and informed families understand the positive risk benefit of ELEVIDYS. But there will be an impact on infusions as we roll out education in the broader physician community and families gain better insight into the profile of this disease-modifying therapy and have their questions answered.
Second, as we have discussed, the administrative process from start form 2 infusion is particularly complicated for gene therapy. It includes, for instance, more appointments, more screenings and steps like single-case agreements, far more than other therapies. As we have launched the broader label and expanded the actual cadence from start form to infusion is taking about 1 month to 6 weeks longer than our original estimates, informing our forward forecasts. For the avoidance of doubt, this is not about ultimate access, but the administrative steps to get infused.
As you know, we are quite proficient in working with sites to gain access. In fact, for our PMOs, our ultimate rate for gaining payer access has been well over 90%. And for ELEVIDYS, it currently remains at 100%, we are taking actions to shorten that turnaround time. There are some reasons to believe that our first quarter experience, which includes illness related delays and the typical first quarter insurance changes that can cause delays may have been longer than steady state. But for purposes of setting guidance for the year, we are assuming our first quarter experience on turnaround times is representative of the year as a whole.
This will have a significant timing impact on infusion and hence a significant impact on revenue in 2025.
Finally, three, the success we have seen with taught sites has caused an imbalance that we need to address across this year. 60% of our current revenue comes from top sites and top sites and top thought leaders. Their experience and enthusiasm for ELEVIDYS has resulted in many of them being fully booked out to 12 months. We need to direct much of our attention going forward to sites with more capacity. And we do not take lightly our decision to change guidance.
But given the environment and some of the constraints we are working to address, we do believe it prudent. What we do know is this, ELEVIDYS is the first and only available disease-modifying therapy that offers the possibility of arresting further muscle damage in 80% or more of patients being daily damaged by Duchenne muscular dystrophy.
It is a disease-modifying restore of significant amounts of a form of muscle protecting dystrophin and has observed over multiple studies, over 8 years of clinical experience and clinical evidence and in hundreds of patients of data, it is the only gene therapy proven to preserve function in boys dying from Duchenne. Without intervention every day, muscle of boys with Duchenne is destroyed and permanently replaced by fat and fibrotic tissue. With the FDA following the positive expert advisory panel and approving ELEVIDYS broadly for boys with Duchenne, families finally now have a chance to choose a different journey.
Now that a disease-modifying therapy is finally available to them. If families are delayed in getting a therapy that can finally protect them from Duchenne's relentless damage and they are delayed either because of administrative issues or other delays or lack of information or even at times circulating misinformation, then we will have failed in our mission, and I hope we have proven repeatedly over these last 8 years, and we do not intend to fail in our mission. After our Chief Customer Officer, Dallan Murray, provides an overview, we will hear from our Head of R&D and Chief Scientific Officer, Dr. Louise Rodino-Klapac. She will speak to you about the continuing evolution of data for the impressive efficacy of ELEVIDYS and our plans to expand even further the population of patients who will have access to ELEVIDYS.
Finally, Dr. Rodino-Klapac will provide an overview of the great progress we are making on our LGMD portfolio, and we'll discuss our progress with our siRNA platform, including our plan to share our proof of biology and proof of concept data from both our FSHD and DM1 programs in the second half of this year.
And with that, let me turn the call over to our Chief Customer Officer Dallan Murray. Dallan?

Dallan Murray

Thank you, Doug, and good afternoon. My comments today are focused on 3 areas: context for what happened in Q1, how we plan to achieve our revised full year guidance for 2025 and what gives us confidence in our ability to achieve that guidance. Regarding our Q1 performance, in addition to the safety event, there were 2 issues that impacted our results late into the quarter. Firstly, the severe flu season caused a number of patients to delay their infusion dates. Secondly, we faced administrative issues at some sites the most impactful of which was with Medical, California's Medicaid program that pushed out patients infusion dates.
Importantly, these specific administrative challenges have now been successfully resolved.
Now I'll outline how our first quarter performance informed our revised guidance and the actions we'll take. First, the safety event led some patients and families scheduled for late March dosing to delay treatment while they saw out more information. We immediately initiated extensive outreach to our leading treaters in the broader community. Conversations have revealed that access to comprehensive safety data, including our Biomet marker safety data, which Louise will discuss in her prepared remarks, in conjunction with the 2-year EMBARK data provides the necessary context for health care providers and patients to move forward with confidence.
Our current focus is on disseminating this information across the wider treating and referring physician landscape, which is a process that takes time. As a result, we anticipate Q2 revenue could be as much as 20% lower than Q1.
Looking ahead, we project a pickup in demand beginning in the summer and extending through the remainder of the year. Therefore, our long-term demand outlook for the therapy remains strong, and we expect only a temporary impact. Furthermore, we are encouraged that we continue to receive enrollment forms for both ambulant and non-ambulant patients. Secondly, as we discussed the administrative path for gene therapy from initial paperwork to infusion is inherently complex, involving significantly more appointments, tests and steps than typical therapies.
However, with the broader label and our expansion to a wider range of patients, the actual start form 2 infusion cadence is extending by 1 to 1.5 months beyond initial estimates. This longer duration is primarily attributable to more rigorous screening protocols implemented to ensure patient safety within this expanded population, coupled with the intricate logistical requirements at the site level, including the navigation of single case agreements with payers.
We are actively working with individual sites to create more efficiencies and less delay and have developed comprehensive tools for families to help navigate the journey. But while we are working to shorten turnaround times, we are nonetheless taking a conservative approach and incorporating the longer Q1 turnaround into our revised 2025 guidance.
Thirdly, regarding site capacity. We observed a dichotomy across our network. While our total network capacity is robust, our most established and recognized treatment sites are facing substantial demand, resulting in appointment lead times approaching a year due to near full operational capacity. Simultaneously, a significant number of treatment centers across the country have the potential to increase their patient volume and contribute more significantly to our reach.
Our strategy involves a proactive approach to engage these centers more deeply through enhanced high-touch support like we have done with the leading treatment centers. This focused effort bolstered by the encouraging 2-year clinical data we highlighted earlier, is generating positive momentum in expanding our site engagement and our overall network utilization.
Lastly, our teams are now intensifying their efforts to promote the deep and impressive evidence for the benefits of ELEVIDYS. We launched our comprehensive HCP and patient promotional campaign in the first quarter, which includes a fully built-out elevidys.com website and significant direct-to-consumer investment through digital channels designed to drive awareness and understanding.
With focused work already underway to address these 3 key areas: education, tightening turnaround times and site capacity optimization, we have a clear path forward to effectively support the patient community and achieve our revised guidance. Taken together, we firmly believe that our collective efforts are guided by the critical principle that time is muscle and will ultimately result in more patients gaining access to our therapy faster. The fundamental size of the opportunity remains unchanged, and we are resolute in our intention to reach every eligible patient and continue to change the course of this devastating disease.
Thank you for your attention today. And with that, I would like to hand over the call to our Head of R&D and Chief Scientific Officer. Dr. Louise Rodino-Klapac. Louise?

Louise Rodino-Klapac

Thank you, Dallan. The role of science in transforming patient lives has never been more important than it is at this moment. At Sarepta, science is foundational to who we are. I'll focus my comments today in 3 areas: ELEVIDYS, including additional data that supports safety and efficacy, the progress we've made in advancing our limb-girdle portfolio, solidifying our scientific leadership in neuromuscular diseases and the momentum behind our siRNA therapies, including the opportunity they hold to be best in class.
Further, we are excited to share the depth of our research at our upcoming R&D Day later this year. This work will fuel future innovations to treat diseases for which therapies are either nonexistent or inadequate. Beginning with ELEVIDYS, we provided data to the FDA, and we'll continue to work with them on any necessary updates to the ELEVIDYS label or monitoring requirements. Safety remains our top priority and as we have these past weeks beginning at MDA, we will continue to ensure that our community stakeholders are informed in a timely manner and that we address their questions.
Regarding safety, in patients treated with ELEVIDYS, we see no difference in the rates of adverse events and relationship to age or weight. Furthermore, no relationships have been identified between the liver safety biomarkers, bilirubin, GGT and INR and the total dose administered for patient age or patient weight. Shown on this slide are bilirubin values versus all cohorts in Study 103 and EMBARK. Regardless of whether it's change from baseline, absolute peak or peak value, there is no correlation with weight or age. The same holds true for cardiac safety biomarkers, including troponin.
The totality of our data in over 800 patients support safety of ELEVIDYS weight-based dosing across the label population of patients with Duchenne, regardless of ambulatory status. Life cycle development for ELEVIDYS continues to congress, highlighted by multiple activities.
Starting with ENVISION, our post-marketing commitment trials for ELEVIDYS. ENVISION to Phase III global placebo-controlled trial in older ambulatory and non-ambulatory individuals with Duchenne and has progressed well. In the United States, enrollment is complete, and we continue to dose ex-US. Our last patient last visit is expected in 2027 following an 18-month placebo-controlled period.
Next, for AAV-Rh74 antibody-positive patients, we are conducting 2 studies, Study 104 with imlifidase to cleave antibodies and study 105 to remove antibodies with plasmapheresis. We expect to have expression and safety data from both of these studies in the second half of 2025. We continue to advance our understanding of ELEVIDYS and publish and share these scientific data in support of the DMD population. The evidence continues to build supporting safety and efficacy of ELEVIDYS, particularly as time progresses as compared to the natural history.
In that spirit, we shared important updates at this year's NDA meeting, including results from our 2-year EMBARK and 3-year pooled analysis, indicating stabilization or slowing of disease progression compared with well-matched external control assessed by functional outcomes predictive for delaying loss of ambulation. At 2 years, EMBARK Part 1 ELEVIDYS-treated patients demonstrated statistically significant and clinically meaningful functional benefit in NSAA total score, time to rise and 10-meter walk run versus a propensity score weighted external control cohort.
In addition, and as previously mentioned on last quarter's call, the muscle MRI data we observed showed minimal progression in underlying muscle pathology in ELEVIDYS-treated patients, underscoring the importance of treating as soon as possible to preserve muscle. Lastly, we're looking forward to sharing additional data from the EMBARK study at this year's ASGCT's annual meeting this month in New Orleans, Louisiana.
Moving now to our program to limb-girdle muscular dystrophies, or LGMDs, each of the LGMD program builds on our experience with ELEVIDYS. We use the same vector, Rh-74, in both ELEVIDYS and our LGMD programs, which has a differentiated safety profile and high transduction efficiency. To this end, we've requested a platform technologies designation to enable leveraging of shared technology and future applications.
We were thrilled to announce in December 2024 that we completed enrollment and dosing from study SRP-9003 301 for emerging. Our Phase III clinical trial SRP-9003 to treat LGMD Type 2E or beta-sarcoglycanopathy. EMERGENE is a global study and the primary endpoint is biomarker expression of the beta-sarcoglycan protein. A pre-BLA meeting has occurred and the Office of Therapeutic products of OCP has confirmed eligibility for the accelerated approval pathway for this program.
Due to the similarities between ELEVIDYS and SRP-9003, we have agreement to leverage ELEVIDYS data and the SRP-9003 BLA. Director remains on track to submit a BLA to the FDA in the second half of 2025. We are also encouraged by the progress of our other LGMD programs. Just last month, we announced that we completed enrollment in dosing and study SRP-9004-102 or our DISCOVERY study.
Discovery is a Phase I proof-of-concept study evaluating safety and expression of the alpha-sarcoglycan protein after treatment with SRP-9004. SRP-9004, is in development to treat LGMD type 2D or alpha-sarcoglycanopathy. We plan to initiate a Phase III trial before the end of the year.
Also last month, we announced the following input from OTP, we were clear to proceed with study SRP-9005-101 for our COMPASS study in the United States. COMPASS is a first-in-human clinical study of SRP-9005, which is in the development for the treatment of LGMD type 2C or gamma sarcoglycanopathy.
As a reminder and with support from the agency, we adopted a Phase I/III seamless design clinical trial for SRP 9005, with the aim of facilitating a more efficient and faster path to BLA. We also look forward to highlighting our impressive pipeline and research at an upcoming R&D day in the latter half of 2025. As a preview, we have numerous programs in various stages of development across neuromuscular, central nervous system, cardiac and pulmonary indications. Many of these programs were nearing IND.
On the research side, we've continued to innovate across platforms, developing new AAV capsids as well as driving innovation in gene editing and enhanced delivery for RNA. The momentum around our other programs continues. We look forward to sharing data with you later this year around our FSHD 1 and DM1 programs. Beyond the multiple high-value catalysts to come this year and into the coming years, or siRNA programs leverage Sarepta's successful track record in developing and commercializing neuromuscular therapies, while also expanding our portfolio into CNS and pulmonary and broadening our focus into chronic therapies alongside onetime therapies.
SRP 1001 is currently in clinical development to treat FSA Q1, and we are encouraged by the nonclinical data generated thus far. Cohort 2 in the SAD study is now fully enrolled, and we look forward to the data readout later this year.
Turning to myotonic dystrophy type 1, or DM1, Cohort 1 in the SAD study is now fully enrolled, and we look forward to sharing the data from that study later in the year. Now to discuss our PMO platform. The ESSENCE trial, our post-marketing requirement for golodirsen and casimersen as well as mission for post-marketing commitment for EXONDYS are both fully enrolled and remain on track. We look forward to sharing data as soon as these studies are completed. And continue to collect and publish real-world data on the long-term effects of our PMO.
In closing, I'd like to take this opportunity to thank my Sarepta colleagues and those in the patient and clinical community. For those of us in the field of genetic medicine, the work continues and good science will always prevail. We must scrub the opportunities before us because patients are waiting.
I'll now turn the call over to Ian for an update on the financials. Ian?

Ian Estepan

Thanks, Louise, and good afternoon, everyone. This afternoon's financial results press release provided details for the first quarter of 2025 on a GAAP basis as well as a non-GAAP basis. Please refer to our press release available on Sarepta's website for a full reconciliation of GAAP to non-GAAP financial results. Beginning in the first quarter of 2025, the gains and losses on mark-to-market of strategic investments are excluded from our non-GAAP results.
For comparison purposes, non-GAAP financial results for the first quarter of 2024 have been updated to reflect this change. In Q1, we delivered strong year-over-year growth in revenue, continued disciplined approach to investment in R&D and SG&A and maintain our strong cash position with $647 million in cash, cash equivalents and investments and restricted cash as of the end of the quarter, and $600 million of additional liquidity available through our revolver.
The decrease in our cash balance from last quarter was due to the funding of the Arrowhead collaboration upfront consideration of $825 million with cash on hand. Note, we have reported a Q1 GAAP and non-GAAP operating loss of $300 million and $250 million, respectively, both included a $584 million of R&D expense associated with our global licensing and collaboration and stock purchase agreement with Arrowhead.
Excluding this transaction, we are reporting a GAAP and non-GAAP operating profit of $283 million and $334 million, respectively. In the first quarter, we delivered $612 million in total net product revenue, representing year-over-year growth of 70%. ELEVIDYS net product revenue was $375 million and grew 180% year-over-year and net product revenue from our PMO exon skipping franchise was $237 million, up 5% over the prior year.
In Q1, we recognized $133 million of collaboration and other revenues. This primarily reflects $112 million of collaboration revenues related to Roche expired options of a certain program as well as $17 million of contract manufacturing revenues for sales of commercial ELEVIDYS supply to Roche. The reimbursable co-development costs under the Roche agreement, which is recorded at the contra operating expense totaled $29 million in Q1 compared to $22 million for the same prior year period.
Total revenues were $745 million in the first quarter and increased $331 million or 80% year-over-year. Q1 cost of sales totaled $138 million compared to $51 million in the same period of '24. The increase was driven by an increase in ELEVIDYS sales as well as an increase in cost of sales related to products sold to Roche.
Now moving to our R&D expenses. On a GAAP basis, we recorded $773 million and $200 million in R&D expenses for the first quarter of 2025 and 2024, respectively, a year-over-year increase of $573 million. The increase is primarily due to the $584 million upfront and milestone expenses associated with aforementioned Arrowhead collaboration. On a non-GAAP basis, R&D expenses were $749 million for the first quarter of 2025 compared to $178 million for the same period of 2024, an increase of $571 million.
Now turning to SG&A. On a GAAP basis, SG&A totaled $134 million, up 5% year-over-year. This increase was primarily driven by an increase in compensation and other personnel expenses and higher sales and marketing spending to commercialize ELEVIDYS. On a non-GAAP basis, SG&A expenses totaled $107 million, up 7% year-over-year. On a GAAP basis, we recorded an $83 million charge in other expense net in Q1 '25.
This was primarily due to the loss on strategic investments, which includes a recurring fair value adjustments of investments of publicly traded companies, including Arrowhead. GAAP income taxes were $64 million in the quarter compared to $5 million in the prior year.
The increase is driven primarily by increased taxable profit, largely due to ELEVIDYS revenues. Also on a GAAP basis, we reported a net loss of $448 million or $4.60 per basic and diluted share for the first quarter of 2025. We reported a non-GAAP net loss of $332 million or $3.42 per diluted share.
Now turning to our outlook for 2025. As mentioned earlier, we are revising our total product revenue guidance to $2.3 billion to $2.6 billion. This still represents a 37% increase from our 2024 total product revenue at the midpoint. Our PMO guidance remains the same at around $900 million. Our combined 2025 non-GAAP R&D and SG&A expenses, excluding the impact of the Arrowhead collaboration upfront transaction expense and potential DM1 development milestones, remains at $1.2 billion to $1.3 billion.
However, we anticipate to be at the closer to the low end of the range.
With our undrawn $600 million revolving credit facility, we are in a strong position to further invest in internal and external innovation and to support our capital allocation strategy. We believe our recent share price levels do not reflect the current value of the company today nor the growth potential we expect to achieve in the future. As such, we remain opportunistic and disciplined within our capital allocation strategy to deliver value to our shareholders while also preserving financial flexibility to invest in our long-term growth opportunities.
We remain well positioned for the future with 4 approved therapies, generating significant revenue and revenue growth, and we remain committed to sustained profit, operating expense leverage and positive cash flow for the remainder of the year.
And with that, I'll turn the call over to Doug to start the Q&A. Doug?

Douglas Ingram

Thank you very much, Ian. Marvin, let's open the lines for Q&A.

Question and Answer Session

Operator

(Operator Instructions)
Tazeen Ahmad, Bank of America Securities.

Tazeen Ahmad

Doug, I just wanted to ask you, on those 3 factors that you mentioned right at the beginning of the call, the capacity issues, the administrative processes that you mentioned and the results of the patient (inaudible) families to have questions. which one, if any, has been the biggest driver of potential downside pressure leading you to revised guidance? And then as 2Q has progressed, have any of those I guess, gotten worse because you're talking about 20% lower sales relative to 1Q and we're still pretty, I guess, relatively early into the quarter.

Douglas Ingram

Thank you for your question. So first, on the balance, it is a mix of all 3. I think the cycle times is probably the 1 that mechanically affects forward guidance the most. But there's a bit of a mix there. What we're seeing going forward is that not a worsening.
In fact, again, we don't have enough data on the cycle time issue to suggest that we're being overly conservative. But we're at a minimum confident that we've hit steady state.
There's some reason to believe it might be a bit conservative. I mentioned earlier in the call, the first quarter had the most severe flu season, I think, in 15 years, and that caused some delays. There's the typical insurance changes that occur in the first quarter of every year. That causes some delays. There's a thesis that may be embedded in this 4 to 6 weeks additional cycle time might be some of that -- those particular first quarter issues.
But I think for planning purposes, we're assuming and I certainly think you should also assume that we're at steady state for the year. We have a lot of work to do, we're trying to do even more efficiently, but I don't think we should assume that we will.
On the safety event, the issue, of course, to remember is that in the when the safety event occurred, it was right before March. So right the last month of the quarter. So of course, those who needed additional information, we're going to have delays and that is going to flow through into the second quarter as well. So it shouldn't be at all surprising that the second quarter would be soft as a result of that and so we're, of course, we're seeing that. And that's going to take some time.
We need to get out there. We need to get to the broader community. As I've mentioned before, in my prepared remarks, when we get to folks when the top thought leaders, which we were able to see right at the MDA conference when this all came out, it was quite clear that they were, to a person, at least from my interactions with them didn't see this as changing their prescribing behavior at all.
And we get the same answer when we talk to families, we just need to get out to more and more families. If you wanted to say what are the signals kind of as we sit here today, the signals are, I guess, what you would call the green shoots because we are seeing start forms are coming in. I can't give you a split right now, but start forms are coming in, both for ambulatory and non-ambulatory right now. So I think we are seeing the -- as we communicate and as we talk and as we educate, we're seeing that occur.
And over time, there should be no difference in the reaction to this depending on whether you're ambulatory or non-ambulatory because as you saw and as Dr. Louise Rodino-Klapac showed you, in fact, the data is quite clear that there's a minority of patients that get liver enzymes, it doesn't occur in any greater amount or any more severity either on liver enzymes or bilirubin on non-ambulatory versus ambulatory patients.
So I would say, we're seeing positivity when we actually get out there and we educate. And we've got a lot of work to do over the course of this year to get to those -- the secondary sites, where there is capacity one of our -- when I said earlier, 1 of our significant issues is we've been very, very successful with the big thought leaders, but those sites are often fully booked. So we really need to get to other sites and make sure that we are getting people to sites that have capacity, and we need to get more education out there, both to those physicians and to the broader family community, and then we'll continue to work on, on cycle times.

Operator

Ritu Baral, TD Cowen.

Ritu Baral

Doug, I want to follow up on that last phrase that you mentioned, how do you direct patients to those sites with more capacity? Are we talking like more community sites and why aren't these sites sort of at capacity like the main centers? Is it a staffing issue? Is it a demand issue? How do you plan on doing that?
And is this the point where you think about opening more sites?

Douglas Ingram

I don't think as we sit here today that it's a number of sites issue. I think it's a focus issue. So really, the issue is -- and it should be of no surprise when you first launched a therapy, we really prioritize the big sites with the real thought leaders with a lot of experience and a lot of start forms, and we've spent a lot of time there. We've spent obviously, time on other sites, and they're all well trained, but we have spent as much time there with a lot of the good educational work that we need to do, including responding to this most recent safety event, but even beyond that, and frankly, in a more positive note, really getting out and talking about the brilliant data that came out on the crossover. Remember, that data is just lights out.
I mean it's -- kids on the therapy for 2 years were statistically significantly better than natural history on every single functional even at the 1-year mark, when you get to the older ages because, of course, the kids dosed in the second phase of the trial, we're older now. Now they're in the decline phase, which is 1 of the problems with our original study as it relates to NSA. They are significant statistically on every measure, including NSA. And then you saw the trajectory analysis. And then you saw the muscle MRI, do you want to linger on that muscle MRI.
That's a really powerful thing. I think there was probably a moment when some of us wondered whether you would actually be able to see in one year a really significant difference in muscle quality, what you do across a significant number of muscles you see this very different result where kids that have been dosed with ELEVIDYS have their muscle preserved and much less fat in fibrotic tissue and kids that didn't get dosed a year later or missing a lot of that muscle and have a lot of infiltration of fat and fibrotic tissue. We see to get all of that information and have those conversations with those secondary sites.
What we can't do in any real way or in a thoughtful way to sort of redirect people's start forms from 1 site to another. That's really not possible. What we can do is really spend a lot of time with them, spend a lot of energy with them and spend a lot of education with them as well as making sure that we're educating the patient community across the United States. And I think it is going to create significant dividends, both I think for us and our revenue, but far more important than that, getting kids infused that are going to benefit from this life-changing therapy. Thank you for your questions, Ritu.

Operator

Louise Chen, Scotiabank.

Louise Chen

I wanted to ask you, of the new guidance you gave, what percent of sales does ELEVIDYS represent? And also, are you planning or expecting that sales will recover starting in the third quarter?

Douglas Ingram

So the -- 2 answers to that. Obviously, we're pulling our guidance down primarily -- well, exclusively really from ELEVIDYS. So you can do the math on that. This is an ELEVIDYS related issue. And then yes, we are assuming starting in the summertime and starting really in the second half of the year that we're going to see a significant uptick.
We're already seeing, again, using a (inaudible) phrase, the green shoots of that. But what we really do know when we've talked to a lot of physicians is there are a lot of families that prioritize the summer program.
There's a lot of monitoring that goes on with this therapy. lot of times, people have to travel with this therapy. There are other family members and brothers and sisters to be considered. And so we really are expecting and we believe we're going to see a significant uptick starting in the summertime plus the back half of the year as we execute. And we will execute.

Ian Estepan

Yes. Very specifically, we gave guidance of $900 million for our PMO. We maintained the guidance of $900 million from our PMO franchise. So the revision in our total net product revenue was all related to level.

Operator

Andrew Tsai, Jefferies.

Andrew Tsai

My question is around this -- following this patient death. Some investors are wondering about a worst-case scenario where ELEVIDYS is pulled from the market, something more drastic basically than what your revised guidance assumes. The appointment. And the appointment of Dr. Prasad today might not help with that narrative.
So can you walk us through how you think about that potential risk, especially since you do have an accelerated approval in the non-ambulatory DMD.

Douglas Ingram

Sure, sure. First, on the appointment, I want to be clear, I'm not going to obviously comment on any particular appointment, which we just got news of today. What I do remain confident about is that the FDA is going to be the FDA that it's been for the last 100 years, which is an organization dedicated to following great science and fulfilling its mission of bringing life-enhancing therapies that are safe and efficacious to patients. And there's no reason to believe that, that should change or that anyone would permit that to change. I would remind you as it relates to ELEVIDYS, the evidence for its approval was brilliant at the time absolutely remarkable and then only got more impressive over time following a positive Advisory Committee meeting.
We got the original approval. The totality of evidence was clear that we were changing the trajectory of this disease. And then thereafter, we have the crossover data that we unblinded all prespecified every functional measure was strongly statistically positive, the muscle MRI is brilliant. There's no doubt that this therapy is changing the lives of patients. There is no reason to believe that this safety event would be the motivator as an example for something drastic with this therapy.
I would remind you that ELEVIDYS has 1 of the most impressive safety profiles in the context of AAV-mediated gene therapy that has ever existed. It is true that every AAV-mediated gene therapy comes with a risk of elevated liver enzymes. And in other cases, there have been significant consequences for that. They are rare. With respect to us, they are particularly rare.
In fact, this 1 incident is unique, not only in its outcome, but even in the sort of the course of it.
There's something very different about it. And it's in the context of AAV-mediated gene therapy. It's in the context of the understanding that there is always a risk of elevated liver enzymes in the vast majority of cases. And with this 1 case being the only exception, they respond very rapidly to a modest increase in steroids and come back down to baseline. So -- there is no reason to believe that a science-driven organization and science minded regulators would be considering anything other than the fact that they should be proud that they approve this brilliant therapy.

Operator

Eliana Merle, UBS.

Eliana Merle

Just in terms of a potential label update for ELEVIDYS, can you talk us through your latest expectations there for any potential update or conversations with the FDA after the patient death. I guess when could we potentially hear about a label update and what your expectations are for what this could look like?
And then just in terms of the commercial uptake, you mentioned that there were some patients who were scheduled for late March that delayed their dosing. What proportion of those have now rescheduled their infusions?

Douglas Ingram

So let me answer the second question first by simply telling you I don't have the data available to me right now. But it was really -- those were primarily a function of patients or they're physicians who saw the news of the event and needed information. And they're coming up to an infusion in a week. And so they had to either pause or more -- most likely in almost every case rescheduled immediately so they could get access to that information.
As it relates to your first question, I will turn the call to Louise, who can provide an update on the label update.

Louise Rodino-Klapac

Sure. In April, we submitted a labeling supplement. We already had 1 planned and anticipated. And so at that time, we also updated the label to include this patient death and the case of ALF. And so FDA confirmed receipt of that and set a target review date.
So the target completion date will be no later than the fourth quarter this year for those label updates.

Operator

Brian Abrams, RBC Capital Markets.

Brian Abrahams

Maybe shifting gears to limb-girdle. Following the pre-BLA meeting, have you had any additional meetings with the new FDA leadership on the limb-girdle programs and curious their updated feedback on the accelerated approval path for 2E. And then I guess on 2E, is the emerging data still expected to be disclosed publicly by the middle of 2025? Or should we expect that that's going to be initially submitted to the agency? I didn't see anything in the press release or hear anything in your prepared remarks on data.

Douglas Ingram

I'm going to turn this over to Louise, but let me briefly say the following regarding our interactions with OTP and the LGMD portfolio. So since the change in administration, we have had a number of discussions with OTP and interactions. Everything has remained on course. The approach that they had previously confirmed with us is the approach that they've taken today. So nothing has changed there, which is all very positive.
And I would also say, I know there's a lot of concern over the fact that the FDA has gone through a lot of dislocation.
I think there was an announcement of some 3,500 potential layoffs and that there may be as a result of that delays or slowing down or reviews. But I must give credit where credit is due. We have not yet seen that at all. with our colleagues over at OTP led by Dr. Verdon, Things seem to be quite on track.
And certainly, the approach that they were historically taking is the approach they're taking today.
But Louise, you're going to want to provide more color about that.

Louise Rodino-Klapac

Sure. As we've seen over the past several weeks, we've seen consistent interactions with OTP as we've seen previously. We've had a number of interactions. So on 9003, as noted, they confirmed the accelerated approval pathway is open just as early as last week, they accepted a rolling review for SRP-9003, so things continue to progress as planned. Also, as we announced the same review division cleared the IND for SRP-9005 for QC.
So things are progressing as planned with the agency.

Operator

Debjit, Guggenheim Securities.

Debjit Chattopadhyay

So a couple of questions on 1 on limb-girdle. Is there a threshold for protein expression that the OTP wants to see?
And number two, could you sort of quantify the number of nonambulant boys who have been treated on the commercial ELEVIDYS product?

Douglas Ingram

On the second question, we're not providing that level of data, although I will tell you, we've obviously historically been dosing non-ambulatory kids, we're continuing to dose non-ambulatory kids, and we're getting start forms for non-ambulatory kids.
On the first question, I will turn that question over to Louise Rodino-Klapac.

Louise Rodino-Klapac

Sure. And I think I forgot to answer -- the question on the previous time about -- we will have the emerging data in the first half of this year, which will go into the BLA, that will be expression of (inaudible) protein and safety. On the question around expression levels, as you know, from the 101 trial, we saw expression levels with both doses, both the low and high dose around the 50% mark. We know from preclinical data that much lower expression leads to functional benefit.
So we anticipate the results that we see from EMERGENE will be consistent with that. and will certainly lead to functional benefit and above any threshold of relevance.

Douglas Ingram

And just to add to its first question around the number of non-ambulant patients, I think we have previously disclosed that it's well over 100 patients between the clinical and commercial settings. So we've had good experience there.

Ian Estepan

I think our enrollment forms, or start forms are something like 40% non-ambulatory, 60% ambulatory.

Operator

Salveen Richter, Goldman Sachs.

Salveen Richter

Can you remind us as to the time lines for seeing data from your confirmatory studies across both the exon skipping franchise but also ELEVIDYS?

Douglas Ingram

The confirmatory trial for -- okay. I guess you mean the ENVISION trial. Louise, I'll turn this to you.

Louise Rodino-Klapac

Sure. The last patient last visit for ENVISION is in 2027.

Operator

Brian Skorney, Baird.

Brian Skorney

I guess just in regards to the changes that CBER and meetings with the FDA, you said that you're expecting a decision on labeling update to ELEVIDYS no later than the fourth quarter. I'm just wondering, is there any sort of formal meetings that are held with CBER along with that? Or is it just sort of an internal review until they make that decision?
And then when we first heard about the patient death, I know there's a complicating factor with the reactivation of latent virus. So I was just wondering if the wound up being a biopsy and if you had anything informative on that front.

Douglas Ingram

I'll answer the last part of it to think it easier on Luise. We don't have the autopsy results yet. We're waiting for them. We should get them in the next month or they may or may not be additionally informative. And as to the first of your questions, I'll turn this to Louise.

Louise Rodino-Klapac

Regarding the label update, the FDA would just come back with any questions along the way if needed. And really, it's more of finalizing the label update, not necessarily that we're awaiting a decision on it. So they've already confirmed that they are in general agreement. So it's really just going through the process now.

Operator

Michael Ulz, Morgan Stanley.

Michael Ulz

Maybe just another one on ELEVIDYS trends and more recently, just curious if there's been a shift in the age of the patients being treated or in the ambulatory status of those patients being treated?

Douglas Ingram

Yes. Thanks for your question. I think it's too early to know precisely what the trend is. What I can tell you, which is a little more anecdote than precise trending is that we are continuing to see both ambulatory and non-ambulatory start forms coming in. So I don't know if we track this out 2 months, if that 40% will go down to 35%.
But as it stands right now, we're seeing good uptake in both ambulatory and non-ambulatory from a start form perspective.
And I will say, let me forecast the future a bit, of course, the real issue is what happens when the information gets out to patients. And 1 of the things I want to remind us about is that there is no difference in any of the markers, any of the elevated liver enzyme markers, any of the bilirubin marker, there is no difference between ambulatory and non-ambulatory and for instance, risk of elevated liver enzymes or liver injury. So there really should be no reason if we educate properly why there would be a significant difference in start forms.

Operator

Gil Blum, Needham & Company.

Gil Blum

Maybe a different approach for kind of the same topic as it relates to the patients who kind of took a minute to think about whether to go on treatment post the event. Was there any commonality across them, more ambulatory, non-ambulatory or is just the timing thing.

Douglas Ingram

So I'm sorry, timing. It's just a timing thing. They were in March and that was approximately in very end of February, early March was the announcement.

Operator

Joe Schwartz, Leerink Partners.

Joseph Schwartz

We noticed the company recently hosted a meeting with PPMD after the patient death. I'm just wondering how impactful were these interactions? And I know that there's an upcoming annual conference in June, so I'm wondering what are the company -- what the company's plans now to interact with these organizations? And what do you think you need to emphasize with these families in order to underscore the positive risk benefit of ELEVIDYS?

Dallan Murray

Yes. I mean I think that webinar was very meaningful, but it's not the end. I think we are committed to giving the broad community. Remember, there's some 10,000, 12,000, 13,000 Duchenne patients in the United States. And we need to get the information out to the broad community so they can make intelligent decisions and evidence-based decisions with their physicians.
At the same time, by the way, side now. We have to do the same thing with the physicians because they -- the physician is the ultimate guider for the decisions of the families.
And the information that we have to get out to the world is both the safety profile of this therapy but also the efficacy profile of this therapy. We can't leave one behind because we can't make a good risk-benefit decision without it. And that's one of the things that we need to do. I think in part because of the amount of data we have and the fact that, that data has come in over a significant period of time, I sometimes worry that people aren't seeing all of the information and all of the evidence of the benefits of ELEVIDYS together because it's a really impressive package that, I think, to any rational physician will indicate that this therapy is a significant disease modifier that has the potential for stopping this ferocious muscle damage or at least a significant amount of the muscle damage and then slowing or fully arresting the decline that is inevitable with Duchenne for anyone that doesn't get treatment.
So we just need to get that -- we need to get all of that out. I think 1 of the things we focused on very significantly in that recent webinar, of course, was sharing the most recent information about the safety event. And I think that was extraordinarily appropriate. On a go-forward basis, we need to talk about all of it in the context of all the safety and the efficacy available to us, and we are committed to doing that.

Operator

Yanan Zhu, Wells Fargo.

Yanan Zhu

Great. First, I would like to ask for a clarification question regarding the uptick that you anticipate in the summertime for patient demand based on some leading indicators you're seeing. The question is, there must also be a leading indicator of some decline, and that's because you're lowering guidance how do we reconcile a decline and also an uptick? Could we assume that you're seeing pickup in pace of the starting -- patient's start forms coming in towards the more recent period.
And then sorry about that long-winded question, a follow-up in much straightforward question about peak sales estimate, do you have any comment on whether you are changing your guidance on the peak sales and the time to reach that peak?

Dallan Murray

Yes. So on your first question, both are great questions, let me answer. On your first question, the lowering of guidance is multifactorial, as I've mentioned, but there's no doubt that as a result of the safety events and the need to get more information to patients, we saw a drop off initially. Now when we say we're already seeing an uptick, and we're going to see a more significant uptick in the summer, that's because -- that's what we're seeing. So someone asked earlier why are you assuming a flat to down second quarter?
It's because this is a long cycle time therapy and a lot of people need more information to contextualize things and that cost it as we're getting that information out. We're already seeing that uptick in start forms. And then when we talk to the families but also sites, it's quite clear that there is a belief among everyone that they're going to see a very significant uptick in the summertime when you get past the school a year in some of those issues.
So I hope that answers your question. So the second issue was on peak year sales. So we're not prepared yet to talk about peak year sales, but I want to put the concept of peak your sales in the context of a onetime therapy. Normally, the peak year sales is an indication of the ultimate opportunity of the therapy. And onetime therapy is different.
It's an under -- it's essentially area under the curve analysis. So how long it takes to get to peak and will change the actual peak, but the same opportunity exists essentially under the curve. And there is no reason to believe that the opportunity has become any less diminished now even though we are reducing our guidance for this year because of the -- some of it being cycle time, some of it being some educational needs, some of it being some imbalances in sites that we need to address. The ultimate opportunity remains the same.
We are correct in our epidemiology. We know the patient population and the size of it. There's no reason to believe there's any smaller population, this is amenable to. And so the same opportunity exists, what that -- what a delay in uptake implied by the $500 million delta in our guidance implies. And what that means for peak year sales is something we'll have to calculate and then look at it and talk later, maybe later this year, maybe early next year, something along those lines.
But the opportunity remains the same. The same ultimate NPV should exist in either case.

Operator

Kostas Biliouris, BMO Capital Markets.

Konstantinos Biliouris

To the extent you can comment on that, can you talk a little bit about the decline of ELEVIDYS ex-U.S. sales quarter-over-quarter? And to what extent those 3 headwinds you mentioned for U.S. may also apply ex U.S. at least anecdotally?

Douglas Ingram

Well, I'm hesitant to discuss our partners' sales and I would allow our partner to comment on it. I'd be surprised if it related to any of the cycle time issues or even the safety event or the like that we have in the United States, but I would have to beg off that question and ask you to ask Roche about that.

Operator

Anupam Rama, JPMorgan.

Anupam Rama

Sorry about that. Just a quick clarification question. Louise, I think you said in April, you submitted a labeling update and had some of the patient -- what you knew about the patient death information. But what else was included within that labeling update, did it include the 2-year Embark safety update? Did it include any real-world safety updates.
What all was included in that?

Louise Rodino-Klapac

This is just updating the safety information. So this is about including the information around this particular case previously. It was just around (inaudible). So now this included ALF and the case. So that was the breadth of the uptake.

Operator

Biren Amin, Piper Sandler.

Biren Amin

At the end of February, the company mentioned on its year-end call that there was ample site capacity for both infusion and follow-up. So I just want to kind of ask how site capacity change over the last 2 months? Or what -- or do you think it was more driven by patients being more cautious and need more handling before they sign up for administration? And I think on that last point, is there anything the company can do to provide risk mitigation strategies to physicians, given I think the community is looking for clarity that would derisk future events.

Douglas Ingram

Let me say a couple of things. One, we do in aggregate, have good site capacity. The issue that we have, as I mentioned, in my opening remarks, is a bit of an imbalance where if you just focus on the top sites, by the way, the top sites are responsible for about 60% of our current sales. They've been so sufficiently successful and enthusiastic along with their patients that they are often booked all the way out. Some are booked by a year or more out.
So it's not simply about capacity because we can't -- let's be clear. You can't redirect a start form that's sitting at site X that's got a 1-year delay to site Y over in filling the blank, Indiana, it's just sitting there. So we've got to make all of the sites more productive, which is on us. We've got to get out and educate, work with them and the like. And so that's the issue.
Do I think that there was some drop-off in March from families that you would say handholding in my view, would be needed more information and the like? Absolutely, I think that absolutely did happen. And I think we're doing the work there, and I think it works very well because the data and evidence is very supportive of the risk/benefit of this therapy.
And then on risk mitigation, I would just say we have a wealth of risk mitigation in this very laudable safety profile therapy, may be very clear. Like we proactively placed into the label. A significant amount of monitoring, which physicians follow. We have this concepts called Sarepta Exchange, which is really 1 of a kind, where physicians in any site can get access to some of the world's leaders nearly on a real-time basis if they have questions or the like when they're infusing. I think the thing that's going to give people the greatest confidence is the data itself because the safety event that we saw earlier this year was a tragic 1 for that family, no doubt.
So -- but that is in the context of mediated gene therapy generally and it has to be put in context of the number of patients that we've dosed.
I mean I would remind you we hear often of people that announced data 1 patient or 2 patients or 3 patients. We dosed well over 800 patients. So generally speaking, we know the safety profile of this therapy. If something comes out, there's going to be an autopsy that's going to -- that we're going to have access to in the next couple of months. And if something comes out there that can provide additional insight, there were some signals, a signal of a CMV, which is unusual, a signal of another illness perhaps in December.
If something comes out of that autopsy that's enlightening we'll certainly bring it to the community.
I think though, the experts up which I am not on a not yet confident that there'll be something out of the autopsy that will provide additional insight. I think the greatest insight that families can have to make risk-based decisions just to understand this therapy, what it can do for these families, how I can protect muscle. And on the other side, what a generally laudable safety profile it has in the context of a serious AAV-mediated gene therapy.

Operator

David Hoang, Deutsche Bank.

David Hoang

So I just wanted to ask one on any anecdotal experience broadly for patients that have been dosed to date with commercial ELEVIDYS, what you hear from the docs and families -- match up with what you know from EMBARK in the clinical trial experience?
And then just with the PMOs, how should we think about cannibalization of the products, given how the ELEVIDYS commercial uptake curve may be changing?

Douglas Ingram

Yes. On the first one, you referenced it is anecdotal. So to take that with a grain of salt. It's anecdotal, unfortunately, we don't get approvals on anecdote, we get approval on evidence. The anecdotes amaze very clear.
I mean 1 of the things that during this very difficult and chaotic time that's existing in the broader market in biotech specifically and certainly at Sarepta specifically, it is comfort to me when I get videos from families. And we've got -- we're seeing a lot of extraordinary stories from families, kids that are riding bikes, kids are running up and down at an age when they ought to be in a powered wheelchair, kids outpacing their father who's trying to catch them in the woods. There's one particular individual video I watch often.
So what that doesn't mean much. It's only anecdote, but we get a lot of a lot of great anecdote. And I think when families begin -- to get the opportunity to talk to other families and see the experience they're having not only the experience of getting -- going through the process to get infused in the infusion process and the like, but then seeing what it may mean to them and their life going forward. I think it's going to be very, very motivating for families who as yet, maybe don't have a start form.
One other thing I should say, I think there are some interesting information on that in our website, I believe, yes.

Operator

Mitchell Kapoor, H.C. Wainwright & Co.

Daniel Smith

This is Dan on for Mitchell. So we were wondering with the FDA changes specifically Dr. Vinay Prasad, now homing fever. And given this expectation of having more data for approvals, how much your approach to clinical trial designs change? And do you see any impact to your development timeline?

Douglas Ingram

Let me speak to what we know today. Of course, that appointment occurred only today. So what I can tell you is that subsequent to the change of Commissioner McCorry and then the departure of Dr. Mark, we've had a significant number of interactions with our primary reviewer on the biologics side, which is OTP at CBER, and we have seen so far no changes, in the approach they're taking. In fact, Dr.
Verdun appears to be quite innovative in her goal of moving therapies along and relying upon modern tools for drug development.
I would also note that Dr. McCorry hasn't made many public statements so it's difficult to deduce precisely what his views are on things. But he did say in a few recent interviews that he does believe, for instance, with respect to rare disease that relying upon biomarkers and plausible mechanisms of action makes sense. So on whole, I'm going to remain confident that the FDA is going to be a science-based evidence-based organization.
And hopefully, if the interactions that we've had in the last few months or any indication, are going to continue the march towards ensuring that regulatory science can keep pace with actual science and we can begin to really accelerate. To that very end, one of the things that we speak of all of the time is the cost of health care in the United States. And we talk about a lot of concepts in there. And truthfully, we talk about discounts and rebates and outcome-based agreements and all of those things are interesting and probably worth discussing.
But there is one thing more than anything else that from a drug perspective can reduce the ultimate cost of health care in the United States. And that's the ability to make our therapies get them through the regulatory process with less unnecessary burden, get it stripping down to those things that truly add insight on safety and efficacy, collapsing time lines and reducing the cost and risk of them. If you do that, you can start getting therapies out in the United States and then around the world, that will be far less expensive, but equally efficacious and beneficial to patients.
So that's the direction in which I see the FDA historically heading, and I'm confident that the FDA will see that, that's a brilliant answer for society.

Operator

Kristen Kluska, Cantor Fitzgerald.

Rick Miller Miller

This is Rick Miller on for Kristen. Can you just talk about some of the administrative delays in infusion. I think you mentioned a specific Medical delay that you said was resolved. Was there something specific driving this? Any information requests from organization or anything like that you could speak about?

Douglas Ingram

Yes. That very specific issue, which is the administrative delays, specifically in the first quarter, that was really just an administrative issue. It was an administrative issue between the sites of care in Los Angeles County and Medical -- let me give you more detail than you want. So when you -- normally the thing that decides whether a patient gets dosed is a preauthorization. So you get a pre-op.
This is not about that. So this is not about patients ultimately getting dosed. This wasn't a fight over access or anything along those lines.
This is all about families that already had scheduled infusions and had already gotten prior offs from the payers. So it's not about access or anything. It's a really specific administrative issue, which is given the cost of these onetime therapies sites of care, often very, very often, maybe almost universally are asking of the payers that they signed single case agreements for that particular infusion, which is sort of a belt (inaudible) concept of saying, I know I'm going to get reimbursed if I do this.
And there was this hiccup in the first quarter where there was a delay in those single-case agreements. And that caused -- people just couldn't get dosed. They all got rescheduled by the way. They all just -- they all got rescheduled, but outside of the first quarter into the second quarter. And then that issue got resolved between the payers and the state.
Yes, go ahead.

Dallan Murray

And it does -- it's a good question. It does really underscore the dynamics of a onetime therapy that if you compare it to our PMO experience, delays in, let's say, 15 patients in the gene therapy world to get the same kind of financial impact, you'd have to have the delay of 150. It's a tenfold impact for a onetime gene therapy versus a chronic therapy. So small swings matter, but that works both on the upside and the downside.

Douglas Ingram

Yes. I do want to make sure we're absolutely clear that was purely an administrative issue. It's not an issue we've seen before. We understand the single case agreement concept well. One of the things you need to know, though, is that we don't participate in the single case agreement.
That is between the site and the payer itself. But it's not an access issue. It's an administration issue.

Operator

Sami Corwin, William Blair.

This is (inaudible) for Sami Corwin. So in regards to patient education, are there particular -- any particular data sets to the families, what they want to see before gaining more -- to gain a little bit more confidence on ELEVIDYS following the safety event? I know you guys presented a lot of safety data thus far. But do you -- are you hearing anything on family want to see more data in possibly the older non-ambulatory patients to get more confidence there for them?

Douglas Ingram

Well, I'm going to speculate on. I mean I think the things that are important to families broadly. So specifically about the safety event, they want to hear about it, what was it exactly and put it in context. One of the things that family sometimes didn't know is like is this 1 of 5. If you do is you dose 10 kids.
No, we've dosed well over 800 kids. That data points probably becoming stale. We've just over 800 kids. So sort of contextualizing it and what that was about and what that meant.
The second piece of information, I think, that's really important to families to contextualize is, do you see anything different here? Is there something about being ambulatory versus non-ambulatory that plays a role? And the answer to that is no. We looked at all the signals, there is no reason to believe that at all. All of the liver enzyme issues are the same across ambulatory or non-ambulatory (inaudible) the same.
But then I think the next big thing that families need to understand is the efficacy.
They really need to see the efficacy. And that's a lot. There's a lot to talk about there, right? Because we have a lot of data that supports how beneficial this therapy is all of the data that supported the original approval, the totality of the evidence was lights out supportive of it. And then the data that came out a year later from the original study was just, again, completely lights out.
On the 2 years kids that are on the therapy for 2 years were significantly better than natural industry on every single measure. Same was true for the older kids, even at 1 year. The trajectory analysis was just a really interesting opportunity where you got these kids all blinded for 2 years. Some were on placebo, some were on full drug. You cross them over at 1 year.
They're all blinded. So they don't know if they had the therapy before or now they're getting the therapy. And what did you see? Kids that had previously gone the therapy were doing -- got a big benefit and then we're stable and doing great. They got a placebo, they didn't do anything.
They just continue to stay stable. They didn't have a placebo effect even they just became stable. And then the kids that were on placebo when they hit 1 year and they got this -- the therapy, again, they didn't know they got it. they just rocketed up and did brilliant. You saw this huge gap.
So that is really important data for them to see.
And then I would argue that another thing that they really need to see because it -- because this goes not only to the efficacy of the therapy. But the importance of prioritizing getting this therapy, there's a lot of things you can do for your kid. There's interesting therapies out there. This is a disease-modifying therapy. So before you do anything else, you got to modify the disease.
And I would argue that muscle MRI data that they see is really impactful because that doesn't just say that this therapy is important. It says you don't have the luxury of waiting. And I'm not going to criticize families. I don't know families personal issues and why the family might want to wait until the summer versus getting it in the late winter. But I would argue that if you see the muscle MRI data, you're going to feel very motivated.
I got to get this kid on this therapy as soon as my family situation would allow it. Because what we saw again is in just 1 year. If you were not on this therapy, you're going to have a lot more muscle damage that's not coming back.
Our therapy doesn't bring them all back, and you're going to have a lot more fat and fibrotic tissue that's not going to be helpful anyways. I think that sort of whole package of data. And by the way, that's not just for families. This is the kind of information that we really need to share robustly with treating physicians, not only our top treating physicians who get this in spades, but physicians throughout the countries and refers around the country so that everybody understands feels not only the value of the therapy but feels the urgency that these kids need to get infused as soon as an infusion site is available to them and infusion date is available to.

Dallan Murray

And you can see some of the tools that we're offering to patients now on elevidys.com. You can go in and see the various videos, educational tools, including the tools, how we educate them across treatment journey of what to expect and how to -- how to -- what to expect and how to manage that treatment journey.

Operator

Uy Ear, Mizuho.

Leo Watson Watson

This is Leo on for Uy. Is there a reason that patients appear to be flocking towards the leading centers that have full capacity? Do you expect any of these leading sites to increase their site capacity? And to what extent does your updated guidance account for increased number of infusions at the secondary sites that you're not targeting?

Douglas Ingram

So I think it's not at all a surprise that there are so many start forms at the top sites. They are also the top sites. They are -- these are the world-leading Duchenne sites, like you can then I don't want to start naming them because I might forget one, and then I'll be accidentally insulting somebody. But these are the world's leaders in the treatment of Duchenne muscular dystrophy. These are the most renowned sites around the country and frankly, around the world.
So it should be of no surprise that a family when they hear about this (inaudible) diagnosis would want to go to 1 of those sites potentially. And that's why it's there.
So -- and I'm sorry, what was the other part of the question missing it -- but -- anyways, that's the reason that there was this imbalance. And then I guess on our forward -- yes, we're assuming that we're going to get a lot more capacity. We're going to exploit a lot of the capacity in the secondary sites going forward that's going to help us not only hopefully even get to or even exceed our guidance over the course of the year.
And one thing I should remind everybody, all of the sites that are permitted to infuse Sarepta -- I mean ELEVIDYS are well-trained and validated sites, and they are themselves all brilliant sites. So there is no reason to believe you're going to get a different quality of care in 1 of these sites, they're going to all do a great job for you, we need to focus on.

Operator

Andreas Argyrides, Oppenheimer & Co.

Andreas Argyrides

With shares at current levels, how are you guys thinking about the opportunity for implementing the approved buyback.

Douglas Ingram

I'll turn this to Ian.

Ian Estepan

As I said in our prepared remarks, obviously, the stock does not reflect, our guidance still remains $2.3 billion to $2.6 billion. The stock is trading at level. recognizing that. And so we certainly think that it's undervalued. Louise just outlined multiple data readouts from our pipeline also to continue to drive growth.
So we have to balance, obviously, both our investment in R&D and then our investment in a potential allocation strategy, and that's what we mean to going forward. Obviously, we're not going to be too direct about how much we're doing or the like, but it's certainly a consideration that we're looking at.

Operator

Gena Wang, Barclays.

This is Tony on for Gena. So some of our own channel checks have suggested that there are some payers deciding not to cover ELEVIDYS. We were wondering if you could provide any additional color on your experience with coverage so far?
And then second question, when could we potentially expect an update regarding the halt on studies in the EU.

Douglas Ingram

Sure. So first on the first one, just to be clear, I can use the PMOs is the answer. There are always some subset of payers that resist access and require more work. And just 1 of the reasons that cycle times sometimes get extended because you have to go through appeals processes and the like. So there's nothing different about ELEVIDYS and the PMO with the exception that probably on a whole the ELEVIDYS policies are better.
So ELEVIDYS policies are a lot better part because we have a traditional approval for a significant percentage of that approval and in part because we have so much data that supports it. What I will say and ultimately, regardless of policy, the difference is in policies. There's policies to label.
There's a lot of them with ELEVIDYS, and I'm really proud of that. there simply that try to put some restrictions in and then there are some policies that are very restrictive. The ultimate answer is an issue for us, but not actually ultimately for revenue for you because we'll get the kids on the therapy in any of the scenarios. Some will take a little longer than others. And that's why I can tell you that with respect to the PMOs, we're well over 90% success rate in getting those kids on therapy even when a payer might try to take us to an appeal or something.
We love it is our current success rate stands at 100%. suggesting that 5 years from now, we'll still be at exactly 100%, but there's no reason to believe we will be worse than our PMOs and our PMOs are doing great. So we feel very good about it.
And then as it relates to the hall, Louise, do you want to chat about that?

Louise Rodino-Klapac

Sure. The EU process requires a need for a substantial amendment. That typical review time is around 95 days. So that approval to restart is expected around the end of summer. But just to remind you, we are still enrolling outside of the EU as well.
So the trial continues to enroll and we're on track.

Operator

I'm showing no further questions at this time. I would now like to turn it back to Doug Ingram for closing remarks.

Douglas Ingram

All right. Well, thank you all for joining us this evening. I will tell you, it's not enjoyable to bring guidance down. It's the first time frankly, in my career when I've done it, and I don't intend to do it again. But I do think it was the prudent thing for us to do as we're working through some of these issues, and I feel very confident the teams prepared to work through the issues, and we will achieve our guidance.
I mean I'm just talking extemporaneously now.
I came to -- it's more than revenue to me, okay? It's not about revenue. That's not what upsets me. but revenue is the scorecard for what upsets me. The fact is that I came to Sarepta, just about 8 years ago with the belief that along with some other really dedicated people, we might actually be able to intervene and change the course of a disease that's just horrific for families.
And I feel particularly strong about that right now because I literally had to go to a funeral yesterday for a young man who died up Duchenne muscular dystrophy. It's a disease that takes often brilliant human beings and steals them from their family little bit by bit.
And for almost all of history, there was nothing but (inaudible) it was nothing but a physician that got the tell a diagnosis. There's nothing we can do for this boy. So go home and love him and watch him, grow and then die in front of you. And the thought that we might be able to do something about that was extraordinarily motivated. It's why I came here and why me and 15 other people at Sarepta fight every day for the families that we serve.
This is not just a revenue issue for us. This is who we are. And so the very idea that we've gotten to where we've gotten is impressive, okay? We have 4 approved therapies. We have 3 PMOs doing a lot of good for kids.
And we have a gene therapy that's the best gene therapy and the most successful gene therapy ever launched. But it's not good enough. I want to be very clear. That's not good enough, all right? Because every day when a kid who could have gotten infused, doesn't because of an administrative issue or because of a misinformation issue because we didn't get out to the site.
That's a day we failed in our mission, and we're not going to fail in our mission.
So I look forward to updating you over the course of this year, and we've got a lot of other things going on at Sarepta that we're excited to talk to you about later this year. And I thank you all for your support and for your great questions this evening.

Operator

Thank you for your participation in today's conference. This does conclude the program. You may now disconnect.