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Curran Simpson

Thank you, Patrick, and thank you, everyone, for joining us today. We've had an impressive start to the year at Regenxbio and are in store for an exciting remainder of 2025. Today, you will hear about our strong late-stage clinical progress, which sets us up to potentially bring multiple first or best-in-class gene therapies to patients over the coming years. We will also discuss other key elements that we believe position us to successfully transition to commercial stage, including our US-based in-house commercial-ready manufacturing and broad potential to secure non-dilutive funds.
With me on today's call are Dr. Steve Pakola, our Chief Medical Officer; and Mitch Chan, our Chief Financial Officer. I'll start with a review of recent business highlights, then turn it over to Steven Mitch for clinical and financial updates. Then, I'll have a few closing remarks before opening the call for Q&A.
Starting with our most advanced program, RGX-121 or clemidsogene lanparvovec, the potential first-gene therapy and one-time treatment for MPS II or Hunter syndrome, a devastating disease that affects approximately 2,000 patients worldwide. Any day now, we expect the FDA acceptance of the BLA, which we submitted under the accelerated approval pathway in March 2025. RGX-121 remains on track for potential FDA approval in the second half of this year.
Earlier this year, we established a key strategic partnership with Nippon Shinyaku to commercialize our neurodegenerative franchise, including RGX-121 and RGX-111 for severe MPS I, and commercial preparations are progressing well. Together with Nippon, our goal is to deliver RGX-121 to patients beginning in the first half of 2026.
Accelerating quickly, right behind RGX-121 is RGX-202, our next-generation candidate for Duchenne muscular dystrophy. I am pleased to report that our pivotal study continues advancing rapidly. We have surpassed 50% enrollment for our pivotal data set. We're seeing increased interest and enthusiasm from the patient community about RGX-202 and its differentiated profile. And we remain on track to submit a BLA in mid-2026 and seize our unique second to market or fast follower opportunity in Duchenne.
Positive input from our growing investigator community supports our belief that RGX-II has the potential to be a preferred and differentiated treatment option. It's important to keep in mind that, one, RGX-202 is the only investigational next-generation DMD gene therapy in pivotal study and the only investigational therapy with both robust microdystrophin and functional data available.
Two, RGX-202 has the potential to be approved for patients aged one to three, who currently have no access to gene therapy. And last, DMD represents a large addressable market. With over half of the prevalent DMD population projected to remain untreated as of 2027, the expected year of RGX-202's commercial launch.
Given our strong and rapid clinical progress, conviction in our differentiated profile, and in recognition of the ongoing unmet need, we will begin producing RGX-202 commercial supply at our manufacturing innovation center here in Rockville, Maryland in the third quarter of this year. With full clinical and planned confirmatory supply already in hand, we will build commercial inventory to be prepared for a smooth launch and meet patient needs immediately upon the potential approval of RGX-202.
As a reminder, our manufacturing innovation center is a state-of-the-art integrated GMP facility that can produce up to 2,500 doses of RGX-202 annually, enough to treat approximately one fifth of the estimated North American DMD population. All while delivering industry leading purity levels in Duchenne with over 80% for capsids. We look forward to sharing additional Phase 1/2 functional data for RGX-202 in the first half of this year as we aggressively advance towards commercialization.
Moving to our retinal programs, we continue to work closely with our partner AbbVie to progress ABBV-RGX-314 or surabgene lomparvovec. 314 is advancing in two pivotal studies for sub-retinal wet AMD, one Phase 2 study for suprachoroidal wet AMD, and preparations for a pivotal program are underway in diabetic retinopathy or DR using suprachoroidal delivery.
We remain on track to be the first gene therapy on the market for wet AMD with a product that has demonstrated compelling durability and strong patient interest. Both wet AMD and DR represent large multi-billion-dollar commercial opportunities, and we believe 314 has the potential to preserve vision and serve as a meaningful alternative to today's standard-of-care. In summary, we remain excited for and are well positioned to deliver on the opportunities ahead of us.
With that, I would like to now turn the call over to Steve for an update on our clinical programs. Steve?

Stephen Pakola

Thank you, Curran. I'll start with RGX 202, a potential one-time gene therapy for the treatment of Duchenne. RGX-202 uses the Nav AAV8 vector and it's the only microdystrophin construct to include the C-terminal domain, a key element of naturally occurring dystrophin, critical to protecting muscle from contraction-induced damage. This novel construct combined with the highest purity levels in the field, make 202 a potential best-in-class gene therapy for Duchenne.
As Curran mentioned, I'm pleased to share that today we announced the pivotal phase of the AFFINITY Duchenne trial is beyond 50% enrolled. Our accumulating Phase 12 results are showing impressive evidence of differentiation on safety, biomarker and functional outcomes. This is driving increased excitement throughout the Duchenne community, giving us further confidence as we move toward our target of completing pivotal enrollment in the second half of this year.
This trial is enrolling ambulatory patients aged one and above, generating data where limited results exist for Duchenne therapies. Based on the clinical profile and in partnership with our investigators, we expanded the inclusion criteria to a broader range of exon mutations. Additional trial sites continue opening in the US and Canada, and we are making great strides in our pivotal strategy to enroll across a wider age range with an aim to secure a broad label supported by a clear and robust product profile.
In November, we reported positive safety and efficacy data from the Phase 1/2 study, including positive functional outcomes from the first five participants at 9 and 12 months. These results presented last November showed 202 recipients exceeded external natural history controls and established benchmarks for clinical outcomes.
Specifically, we observed functional improvements in all five evaluated patients, including those at dose level 2. Consistent robust expression, transduction and localization of our differentiated 202 microdystrophin in muscle with all participants above 10% expression. We have also seen a favorable safety profile with no serious adverse events or AEs of special interest.
Building on this data in March at the 2025 MDA Conference, we presented new biomarker data from two patients, including the first data from our cohort of patients under four years of age. This patient aged three at dosing had a microdystrophin expression level of 122% of control. Patients aged one to three represent a significant portion of the prevalent Duchenne population, yet this group has no access to approved gene therapy.
Overall, the Phase 1/2 data show consistent microdystrophin expression in all12 patients spanning all age groups, functional improvements and evidence of altering the trajectory of disease,and a favorable safety profile. As the program advances, we expect an increased focus on the dose level 2 cohort, as these patients receive the commercial dose level. We look forward to sharing additional data from the Phase 1/2 study in the first half of this year.
Now, on to our retinal franchise, 314, which is being developed in collaboration with AbbVie to treat wet AMD and diabetic retinopathy or DR. I'll start with 314 for DR being evaluated in the Phase 2 ALTITUDE trial using in-office suprachoroidal delivery. Like wet AMD, DR is a progressive disease that causes vision loss, and ultimately blindness is not treated appropriately.
As we've shared, we've completed our end of Phase 2 meeting with the FDA in the fourth quarter of last year and are actively working with AbbVie on plans for our Phase 3 clinical program that would support global regulatory filings. We look forward to sharing more on that program as preparations progress.
In wet AMD, we are evaluating 314 via two different delivery forms, sub-retinal and suprachoroidal. Within sub-retinol, we have two ongoing pivotal trials, ATMOSPHERE and ASCENT in the US, Europe and Japan. These trials continue to progress well. As we've announced in January, enrollment of both pivotal trials is expected to complete this year, and we expect to share topline data in 2026.
314 is on track to be the first gene therapy on the market for wet AMD. And it's poised to deliver a compelling product profile based on the impressive safety and durability seen in our Phase 1/2A trial. In this trial, 314 achieved meaningful reduction in treatment burden and sustained treatment effect through four years. Overall, we remain encouraged by the ongoing progress with 314.
I'd like to particularly highlight the differentiated safety profile observed in our in-office suprachoroidal program. This is particularly notable in the setting of short course seven-week prophylactic c steroid eye drops, a significantly shorter regimen than those used in other gene therapy trials. This continues to support the potential of 314 as a meaningful treatment option for patients and physicians.
Finally, turning to our MPS program. It's an incredibly exciting time for Regenxbio in the Hunter syndrome community with the recent submission of our BLA for RGX-121. This filing is supported by data from a campsite trial, which met its primary pivotal endpoint with high statistical significance.
In addition, we previously reported that 80% of pivotal dose patients either discontinued enzyme replacement therapy or remain treatment naive, along with evidence of neurodevelopment improvement sustained through four years post-dosing.
121 represents a potential significant advancement, not only improving patient outcomes, but also improving the daily lives of patients and families. As a one-time gene therapy, 121 has the potential to achieve these benefits while also reducing the treatment burden and the significant amount of time families spend getting weekly enzyme replacement therapy. We look forward to an anticipated FDA approval decision in the second half of 2025.
To conclude, we are making significant progress with data updates and trial progression across all programs in our pipeline. I'd like to thank all of the patients, families, clinicians and patient advocacy representatives who have been involved in and supported all of these trials.
With that, I'll turn the call over to Mitch to review our financial guidance. Mitch?

Mitchell Chan

Thank you, Steve. Regenxbio ended the quarter on March 31, 2025, with cash, cash equivalent and marketable securities of $272 million compared to $245 million as of December 31, 2024.
The increase was primarily driven by the $110 million upfront payment received under the Nippon Shinyaku collaboration and was partially offset by cash used to fund the operating activities during the first quarter of 2025.
R&D expenses were $53 million for the quarter ended March 31, 2025, compared to $54.8 million for the quarter ended March 31, 2024. The decrease was primarily due to clinical trial expenses for RGX-314 and RGX-202. We expect the balancing cash, cash equivalent and marketable securities of $272 million as of March 31, 2025, to fund our operations into the second half of 2026. This cash runway guidance is based on the company's current operational plans and excludes the impact of any future potential royalty income associated with RGX-121.
If we include additional non-dive financing, we expect the cash runway to potentially extend well beyond 2026. For instance, some examples of our non-diluted financing options include development and sales milestone, reversion of our royalty income and the potential sale of our Priority Review Voucher or RGX-121, if approved, which has recently sold for at least $150 million. Collectively, we have many non-dilutive financing optionalities that could extend our cash runway well beyond the second half of 2026.
With that, I turned to call back to Curran to provide final thoughts.

Curran Simpson

Thanks, Mitch. As you heard today, there's tremendous momentum and strong execution across our pipeline to advance our programs towards key milestones.
To recap, we have submitted our first BLA and our partnership with Nippon Shinyaku for our MPS programs is off to a strong start. We look forward to a potential FDA approval of RGX-121 this year. The pivotal study of RGX 202 is moving rapidly, and we believe it remains well positioned to potentially serve as the next and preferred gene therapy in Duchenne.
We are planning for success and we will initiate commercial supply manufacturing in the coming months in anticipation of a 2027 commercial launch. We also plan to share updated functional data in the first half of this year. And with enrollment more than halfway through, we expect to complete enrollment of the pivotal study this year and share topline data in the first half of 2026.
Our partnership with AbbVie is advancing towards multiple large global commercial opportunities. We expect to complete enrollment of two global pivotal trials for sub-retinal wet AMD and are working with AbbVie on a pivotal study in diabetic retinopathy in 2025.
As we lead the way in AAV gene therapy, our team is looking forward to presenting at ASGCT this week. Our presentations in New Orleans highlight our in-house and end capabilities and deep translational expertise. Presentations will include pre-clinical research supporting the novel construct of RGX-202, including the C-terminal domain, capsid discovery research and the RGX-202 manufacturing process development enabling industry-leading purity levels in Duchenne gene therapy.
We are in a very unique position in our industry. Each of our assets represent one-time treatments with the potential to transform the trajectory and management of disease for patients in need of new and better options. And are demonstrating beneficial differentiation against standard-of-care and available treatments. And we have a balance sheet that enables us to better navigate the current macro environment and execute against our near-term and exciting milestones.
With that, thanks, everyone, for your time today. I'll turn the call over for questions. Operator?

Question and Answer Session

Operator

(Operator Instructions) Mani Foroohar, Leerink Partners.

Mani Foroohar

Hey, guys. Thanks for taking the call. I've got two quick ones. I think first is around timing for the Hunter BLA. You mentioned this month, you had a couple of people who've reached out around timing, and I admit to doing this math myself, with 60 days marched out from March 13 should be right around now. Is that math too close or we think about it wrong? I think there's a little bit of sensitivity around any hypothetical FDA delay or is it just we're not taking into account federal holidays, and then I have a follow up.

Curran Simpson

Hi, Mani, thanks for the call and the question. Yeah, we're certainly pointing towards imminent in terms of timing around the BLA acceptance. I think we feel really good about where the review stands. We've been getting regular interactions on a few areas, the information requests that normally come in as part of the review. And also, we do orientation meetings early on regarding the submission and the BLA contents. All of that is pretty much business normal. We haven't gotten any questions that would lead us to believe otherwise. And so I think, you'll expect to hear from us soon about hopefully an acceptance.

Mani Foroohar

Great. And moving on to something a little more substantive. Obviously, you and others have watched closely as your competitor Sarepta has had some stumbles both commercially and from a regulatory perspective, and there have been changes at the helm of CBAR, which have driven a lot of debate around the space. I'm not the first or the second or 1,000th to ask that question.
How do you think about the bar for approvability in DMD on an accelerated basis expectations around biomarkers/biomarker data versus functional data? Like where is that conversation and how it evolved with the additional input of what we've seen from Sarepta as well as any potential changes at the helm of CBAR.

Curran Simpson

Yeah, thanks. I think, from the very beginning on the program, we've pointed towards accelerated approval pathway. Those were discussions we had with the FDA in our end of Phase 2 meeting which were very positive and productive. Our intention from the beginning has been to provide functional corollary, if you will, to microdystrophin as part of the filing and review process.
And so we feel really good about our data, the strength of the data in terms of safety profile and initial functional data that we provided. We really look forward to additional functional updates first half of this year to continue that story. And I think we've seen nothing but continued and maybe increased opportunity for us given the benefit to risk ratio we think we're developing and the existence of what we think will be a very sizable prevalent market upon potential approval in 2027.
So I think our conviction and our opportunity only continues to increase as the program evolves. And I think, in terms of how FDA would view that, I think, certainly, Dr. McCarry provided good context on rare disease development and the support for programs like ours where I think we can provide benefit to patients.

Mani Foroohar

Great, thanks for that clarity, guys.

Curran Simpson

Thanks.

Operator

Gena Wang, Barclays.

Gena Wang

Thank you for taking my questions. I will follow Mani's questions. I will also ask a few more. So giving reason a lot of the safety event, so I will ask very specific questions like, do you expect any changes from the FDA regarding requirement of the safety profiles? And also, for your pivotal study, any changes in terms of the enrollment speed and the patient type?
And my second question, lastly, after recent appointment of a new CBAR director, and do you expect any changes on your accelerated approval path that was previously aligned with the FDA?

Curran Simpson

I think I'll take the last one. I think it's very early to project any potential changes and accelerated approval, but we certainly don't see any signs of that today. Our program in terms of enrollment is absolutely on track with how we projected it. We feel highly confident that we will enroll the study this year, the pivotal study of n=30. We'll continue to do enrollment throughout the remainder of the year as well to support our confirmatory study as well.
And I think from the beginning of the program, I've been pointing towards, during the time of submission and review, having substantial functional data to accompany that. So I think I don't see anything emerging in some of the dialogue that we've heard from FDA that's contrary to that approach, so I think our plan is unaltered at this point regarding that.
I do think that the strong functional data we reported in November, coupled with the safety profile to date that we've been able to portray in our earnings and press releases really points towards a potential improvement in benefit to risk for Duchenne patients, and we think that will be something that will be interesting to the review team as we complete our filing next year.
I do think that this points towards our immune suppression regimen, which is, I think, innovative in the sense of proactively addressing known SAE types for Duchenne patients treated with high dose AAV. I think looking at that approach today is directly in line with potentially better outcomes for patients is what we've seen so far in terms of not just the experience during treatment, but then the post-treatment monitoring.
And maybe I'll let Steve elaborate a bit on that from the clinical perspective.

Stephen Pakola

Hi, Gena. Thanks for the question. It is certainly an area of high interest in Duchenne community given the recent death, unfortunately, with the (inaudible) program. I'd say the overarching aspect is that I think you've heard and seen, and we certainly have seen this both the MDA and in our subsequent one on one discussions is this just brightens the spotlight on safety. So I think even before this event, safety is king. And I think that's why a lot of the points that Curran mentioned are only giving greater comfort to our investigators and the patient families that they speak to about the differentiated aspects of our program.
So I think this is why we designed the construct that we did. This is why, over the years, we've advanced and we're very proud of our high purity level with the highest full to empty capsid ratio in the field, and also the robust immune modulation regimen that Curran mentioned. So I think those factors are giving us and the community comfort, and that's why we're absolutely on track with our recruitment.

Gena Wang

Thank you.

Curran Simpson

I think I'd also point to the imminent review and outcome of the hopeful acceptance of the 121 program. I think that'll be sort of an early data point on accelerated approval, as you know the Hunter program is following an accelerated approval pathway. In that case, we had a pre-BLA meeting that was also supportive for that program. So assuming that we conclude with an acceptance of that BLA in the near term, I think that'll be a first data point to support that, that pathway is still viable and an active process in FDA.

Operator

Judah Frommer, Morgan Stanely.

Judah Frommer

Yeah, hi, guys. Congrats on the progress. Thanks for taking the questions. First, I was hoping we could get a little incremental color on the planning process along with AbbVie for the diabetic retinopathy Phase 3 trial. Any updated thinking on timing or potential impacts, the probability of recognizing that milestone? And then separately, just more broadly on interactions with FDA given how many programs you have that you are interacting with them on? Any changes recently you'd point to or is it sort of business as usual and contact with the same individuals as you'd anticipate? Thank you.

Curran Simpson

Thanks. Yeah, I think I can probably comment on the second question first, which is we are actually having a pretty significant number of interactions with FDA both on submissions that have already been filed and information requests that are being provided.
The only way I can really characterize it right now is that it is very much business normal. So without getting into detail on the type -- the details of information requests, none of them are really questioning the broader strategy of the program or the clinical data that was provided. It's more customary questions about the CMC process, etc.
So I think I just would characterize it as business normal. The review teams seem to be quite intact in terms of good continuity with the teams that we met with last year. And like I said, with the Hunter program, we're going to have a very near-term outcome in terms of BLA acceptance, we hope, which will confirm that we're on track for a late fall potential approval.
On DR, we are continuing to collect the final feedback that as we pointed to early in the year. AbbVie and we have obtained feedback from US, EU, Japan, regulatory agencies. As you know, in DR, there's choices to be made in terms of end points that have already been established, two steps worsening, two steps improvement. So all of those are being considered as part of developing a final pivotal protocol. And once that's complete, we'll begin site activation, etc. We're still pointing towards first patient dose this year, and we'll be more specific on timing as we get near that event.

Operator

Ellie Merle, UBS.

Hi, guys, this is [Tejas] on for Ellie. I guess just some of the incremental updates we can expect this year in DMD. So you mentioned some additional functional data in one each. Am I correct in assuming that's not at ASGCT? And then is there an arena you'd expect to present that at or should we expect a press release of that data?
And then, you also mentioned starting commercial supply manufacturing later this year. It's supply but is it the same process that you're using in your current trials? And will you be able to provide any color on the CMC process with the FDA or any other meetings you might have on the statistical plan throughout the year? Thank you.

Curran Simpson

Sure. Let me start with the CMC process. So yes, we did point to initiation of commercial production this year. So that's a combined effort, number one. The batches that are produced as part of our first commercial production are also batches that will be submitted as part of the plan mid-2026 BLA. And the process that's being -- will be validated as part of that exercise is the exact same process that's in the clinic today. So no changes anticipated to what patients are being dosed currently in our pivotal program as we move to our commercial process.
And as we pointed out, we have a a quite mature CMC approach off our platform, NAVXpress process, which we think FDA will really regard highly. In fact, it's the same process that they've reviewed in other programs and actually toured on site as part of FDA training in the last couple of years. So we feel really strongly that we have a very low risk approach to CMC with a process that produces very high purity capsid, which FDA has been cleared as an expectation. And not any significant changes required to get to commercial in which we can produce 2,500 doses per year.
Back to the first question. In terms of data, so we expect -- so there's only I think six weeks left in the first half '25. I think you could expect likely a press release around the additional data. And the focus of the data will really be on expanding the dose level 2 patients that were treated in the Phase 1/2 study out to 12 months. So a larger number of patients out that far and showing all the same functional outcomes that we did in November.
So just trying to enlarge the data set there and as well update on any biomarker data that may have come in recently. But it really will be focusing on the pivotal level dose and how those patients are doing. And I think just in general the feedback we're getting from sites and from investigators is really positive right now.

Thanks. And just quickly, those pivotal dose patients in the Phase 1/2 will be included in the pivotal data set for filing in mid-26. Correct?

Curran Simpson

Yeah, all patients that qualify for the inclusion criteria of the pivotal program would be included in the pivotal. data set.

Thanks.

Operator

Annabel Samimy, Stifel.

Annabel Samimy

Hi, thanks for taking my question. Just to go back to regulatory bodies and changes there, just given the FDA's focus on safety with gene therapy, I guess we've been talking a lot about the rare conditions and how the carrier is very focused on the rare diseases and life-threatening conditions. Does that make it potentially harder for gene therapy and non-life threatening conditions like retinal disease, for example? And are there any issues related to that for the DR indication, any delays there?
And then, one last question regarding regulatory bodies. RFK Junior just asked the HHS Committee on Genetic Screening, so can you tell us how this might affect not MPS but rather DMD and trying to get into the younger population and whether there are any complications there. Thanks.

Curran Simpson

Sure, I can take the second one, but I think maybe first, I'll let Steve comment on whether or not we're seeing any change in FDA stance regarding retinal programs, but I think the -- what I would convey before Steve speaks is I think we know that safety in non-rare is an absolute focus. And I think that's probably the incredible promise of the sub-retinal program. The safety profile in the data that we've seen today looks excellent.
Maybe I'll let Steve elaborate on that a little bit.

Stephen Pakola

Sure. Hi, Annabel. So on retinal, I think another broad aspect is that's not an accelerated approval pathway, so there's not a request for greater flexibility. So fortunately, there, we know the regulatory route and we're already executing on that, for example, in sub-retinal. And we have a plan to do the same in suprachoroidal.
On the safety side, just as Curran mentioned, we feel very good about the safety package that we'll have for sub-retinol and suprachoroidal. And that's because we've intentionally selected routes of administration for 314 that are compartmentalized, and that decrease the risk of the types of safety findings, specifically inflammation that have really hounded other routes of administration like intravitreal.
So we feel very well set up not only in our rare programs, but also in the common retina indications that we're looking at when it comes to safety.

Curran Simpson

And, Annabel, to come back to the question on genetic screening, newborn screening, we're working closely with the MPS society and with Duchenne advocacy groups on newborn screening, and their approach largely is at a state level to advance and increase the number of states that provide that. So I think it would be ideal if all entities were working together in concert on that, but that doesn't mean that if one group is not supporting it, the others won't be able to fill that gap and move forward. So we see that as a priority in rare disease and it's something we'll work with the advocacy groups to support.

Annabel Samimy

Okay, and if I can just ask one quick follow-up to be clear on the last question about ASGCT. You will not be presenting functional data there, correct? I understood it to be a DR within the next six weeks. Is my understanding correct?

Curran Simpson

Yeah, it will not be at ASGCT, so no need to book your flight. We'll definitely likely provide that as a press release in the near term.

Annabel Samimy

Okay. Great, thank you.

Operator

Alec Stranahan, Bank of America.

Hey, guys. Thanks for taking our questions. This is Matthew on for Alec. Maybe just double clicking on a previous point. Has there been any change in baseline characteristics, patient age, etc, that you've seen for the DMD trial? And then, maybe second, what's the percentage purity for your preps that you're comfortable with or looking for, sort of, as you're moving forward with manufacturing?

Curran Simpson

Yeah, we actually -- that is something that will be shown at ASGCT. We have a presentation on the CMC process that I think we'll get quite a nice level of detail for people to see we're very proud of it. But the purity level for the product is 80% or greater. And I think just as important, consistency between batches, which we've heard others struggle with, is also highly consistent between batches. So that's what we would point to.
In terms of I think your question was around enrollment of the pivotal study, we're quite pleased so far with not just the pace of enrollment but the breadth of patient ages that are enrolling in the study to date. So as we look at it today and as we look out towards the remainder of the year, we feel like we will have a very balanced number of patients across the ages to support a broad label when we file.

Operator

Luca Issi, RBC Capital Markets.

Oh, great. Hi, team. This is Shelby on for Luca, and thanks for taking the question. Maybe on wet AMD sub-retinal. You've shown recently that the fellow eye can be treated safely, confirming that the eye is somewhat immune privileged. Are you planning on filing that data? And is your initial label going to reflect bilateral dosing? Any color there, much appreciated. Thanks.

Curran Simpson

Hi, Shelby, nice to see you. Steve is part of the Joint Development Committee that plans, sort of, a strategy around the filings, maybe he can comment on that question.

Stephen Pakola

Sure. Hi, Shelby. Great question. This is actually something that we prospectively addressed even as early as our end of Phase 2 meeting because it's very relevant in wet AMD where most patients do have bilateral disease. So it would be very advantageous if both eyes ultimately could be treated. And we, again, always saw that our [CABR] routes of administration where you would expect less immune response would be more amenable to being able to treat both eyes.
And that's why we prospectively addressed this explicitly with the FDA and that's what led to our fellow eye study. And as you mentioned, we're seeing -- that we're in a good position as far as fellow eye. So yes, I confirm that that's certainly our intent, that this is certainly part of any package that would go in that would inform clinicians on being able to treat both eyes.

Operator

Paul Choi, Goldman Sachs.

Paul Choi

Hi, thank you. Good afternoon and thanks for taking our questions. I want to ask first on RGX-121 at Hunter's with the imminent -- your expectations of an imminent acceptance of your BLA. I just want to see if you're also potentially assuming an ad-com given that this could potentially be the first approved gene therapy for the condition.
And then, second, regarding the RGX-202 Duchenne Phase 1/2 functional data update that you referenced earlier, can you maybe just comment on, again, how many patients we'd expect to follow up for and how current the the data cut might potentially be for that functional update that that's coming up soon? Thank you.

Curran Simpson

Sure, yeah, I can comment on the first question around Adcom. We are planning as if we need an ad-com. From an internal perspective, we have a team working on being ready for that should it be requested. We don't have a final answer from FDA as to whether one is required yet. Initial discussions were hinting towards no. But we're waiting to get confirmation one way or another through the review process, but we will be prepared if one is needed ahead of time.
For 202, in terms of just coming back to -- Oh, I'm sorry, yeah, about the the next upcoming functional release. So we are planning on enlarging the data set to four possibly five patients dosed at DL2 as part of the functional update. Not all of them may be out to 12 months, but minimally they would be out to nine months and so. That's still something that we're pulling together, QC-ing the data and looking forward to getting out before the first half of the year.

Paul Choi

Okay. Great. Thank you for that.

Operator

Brian Skorney, Baird.

Hi, this is Luke on for Brian. Thanks for the question. Sorry if this was already asked, but on the 202 commercial build out, has the team set a goal for the quantity of product that you expect to be available by the time of a potential launch?

Curran Simpson

It's a great question. We're actually going through that process of review now as we evaluate our commercial strategy in total. I would just remind you that in the course of one year, we can produce 2,500 doses. And so we'll come to a point as we get closer to a review of the BLA to talk a little bit more about how many doses we would have at launch.
We would certainly want to be in a position to quickly address the prevalent market with a significant number of doses. We would estimate the prevalent market could be in the ambulatory side of the market, something in the order of 5,000 to 7,000 patients, and we would want to be prepared to quickly be able to address that market. So we'll get more specific on the number of doses available at launch, but we're in a unique position to be able to build a significant amount of inventory ahead of 2027.

Great, thanks. And just one more quick one on your 314 wet AMD studies, has the availability of PAVBLU impacted enrollment pace at all or are these generally unique groups of patients and indication?

Curran Simpson

Thanks for that one. I think I'll ask Steve. He's a little closer to that particular question.

Stephen Pakola

Yeah. Across different agents that are out there, either on the market or investigational, we over time haven't seen any of that impact or recruitment, so we're at a good clip, so that's why we keep reiterating our guidance. So we're excited to finish enrollment this year, excited to have top-line results next year.

Awesome. Thank you.

Operator

Sean McCutcheon, Raymond James.

Sean McCutcheon

Hey, guys. Thanks for taking the question. Just to build on wet AMD, can you provide some detail on how you're thinking about the suprachoroidal opportunity? Obviously, we're looking forward to the start of the NPDR Phase 3, but I think we're all curious on the dose necessary to move forward in wet AMD. And how you're thinking about that value proposition on the fields of sub-retinal? Thanks.

Curran Simpson

Hi, I think I'll let Steve answer that question.

Stephen Pakola

Sure, so this is obviously a massive market. So if you look at the retinal space driven by the anti-VEGF target mechanism and treatments thereof, we're at [18 billion] and continuing to grow. So I think there's a lot of opportunity across the VEGF-driven retinopathies. We and AbbVie are advancing as we were just saying on the sub-retinal global program or wet AMD, so we're obviously excited about sub-retinal delivery for that indication.
We do see increased optionality and opportunities with the one-time in office suprachoroidal, and that's why we both are advancing in that space.
I think DR in particular is compelling when you consider the reality that patients with non-proliferative diabetic retinopathy who have not developed the sight-threatening complications, like DME and like proliferative disease, that these patients really are going to need an in-office one-time treatment option that even if you have greater durability agents, if you're going to need repeat injections indefinitely for the rest of your life, that's not going to be a very compelling opportunity. So that's why we and AbbVie are so excited about the opportunity of a one-time in-office treatment to really address that unmet need of DR.

Sean McCutcheon

Thank you.

Operator

(Operator Instructions) Yi Chen, HC Wainwright Company.

Hi, there. Good afternoon. This is [Eduardo] on for you. Just a quick question if you had any thoughts on the recent announcement about -- this morning, I think or last night about potential pricing on branded drugs, that you feel like that's going to have a significant impact on your ability to price, your gene therapies across these indications?

Curran Simpson

Yeah, I think it's early to tell. I think if you look at some of the commentary by John Crowley from BIO or the Alliance for Regenerative Medicine, I think that initially the impact to cell and gene therapy in general might be less than could be for broader branded therapies.
It's too early to tell, so I think we, from our perspective, there's no immediate impact to anything that we're doing, but certainly something we have to pay attention to and sort of the macro environment as we get closer to an approval.

Got it. Thanks. That's really helpful.

Operator

Thank you. I'm showing no further questions at this time. This does conclude the questionand-answer session, and you may now disconnect. Everyone, enjoy the rest of your day.