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Good day and thank you for standing by. Welcome to the Nektar Therapeutics First Quarter 2025 Financial Results Conference Call. At this time, all participants are in a listen-only mode. After the speakers’ presentation, there will be a question-and-answer session. Please be advised that today's conference is being recorded. I would now like to hand the conference over to your speaker today, Corinne Franklin in Nektar Investor Relations, who is filling in for Vivian Wu who is on maternity leave. Please go ahead.

Thank you, Crystal, and good afternoon, everyone. Thank you for joining us today. With us on the call are Howard Robin, our President and Chief Executive Officer; Dr. Jonathan

Thank you, Corrine, and thank you all for joining us today. During the first quarter of 2025, we've been concentrating on the successful development of our immunology pipeline with a focus on advancing rezpegaldesleukin, also known as RE

Thanks Howard and thanks to everyone on today's call. To begin, I'd like to share with you some of the trial design details for our RE

Thank you, J

Thank you. [Operator Instructions] And our first question will come from Yasmeen Rahimi from Piper Sandler. Your line is open.

Hi, this is Dominic on for Yas. Thank you for taking our questions and congrats on the quarter. Could you – I have a couple questions. One, could you remind us kindly what you hope to see in RE

J

Certainly. Thank you for the question. So, firstly, one of our objectives is that we, of course, had Phase 1 data already and have demonstrated proof-of-concept in atopic dermatitis. So one of the things we'd like to see is a replication of that data. So that's one of the components of efficacy that we'd like to see. And then we'd also compare the results against the other key benchmarks. And of course, Dupixent is a very important benchmark. It is the leading standard of care in this space. So we'd like to be, at minimum, in the range of the efficacy that you see with Dupixent. And then of course, we'd like to even better improve on that and replicate our results of Phase 1. In terms of the number of dose levels that we would like to study, the purpose of the Phase 2b study is it's a classical dose range finding study. So ideally we would identify pretty clear dose and dose regimen that we would take forward. We'd have to obviously see what the results show us. But in the ideal case, we would have one dose level that we would be taking forward into Phase 3 studies. And can you remind me your third question, please?

Yes. It was, what are the expectations for the placebo response in RE

Yes. Okay, thank you. Yes. So as I mentioned in the call, in the Phase 1, we used sites that were 100% in 13 sites, and we saw about a 47% placebo response, which was a little bit on the higher side, still in the range of modern studies, but on the higher end. And it's certainly reflective of a general trend that we're seeing, particularly in sites in the U.S. and so we took, proactive measures in order to try and control the placebo response rate by only enrolling a proportion of patients in the U.S. 17%, and enrolling in the rest of the world for the remainder of the patient population, as well as some of the other things that I mentioned, such as using board certified dermatologists in the majority of sites to have consistent and highest quality rating of the disease. So we'd like to see a lower rate, for example, than what we saw in Phase 1b. And we look forward to reporting the actual placement response rate as we prepare and report the top line next month.

Thank you. Our next question will come from Julian Harrison from BTIG. Your line is open.

Hi, congrats on the progress and thank you for taking my questions on the Phase 2b atopic derm data we’re expecting in June or rather the trial. I have a specific question. I was wondering if you're able to tell us how many patients have progressed to the maintenance portion of the trial so far and of those – how many have crossed over to the escape arm of the trial. Are you blinded to that? Or is that maybe something you could disclose now?

J

Hey Julian. Yes, this is J

All right, thank you.

Thank you. Our next question comes from Jay Olson from Oppenheimer. Your line is open.

Oh, hey, congrats on the progress and thank you for taking our questions. When you share the results from the Phase 2b results study, can you just talk about the scope of the data you're planning to share and of the secondary endpoints which are most important?

Yes, thanks, Jay. So one of the kind of unique things about the dermatology conferences is that they're a little bit more lenient than say ASCO is in terms of embargoed data. And I think that's a good thing here. So certainly when we present the top line data, the primary endpoint will be key element that we represent and that's the percent change from baseline and easy score and compare to placebo, all of the cohorts one by one. And then there are secondary endpoints and you ask which ones are quite important. So definitely EASI-75, EASI-90, the IGA quite important. Probably itch is also quite important. I mean those are the ones that really first they are used as registering endpoints in the case of EASI-75 and IGA. And also things like itch are just key for the kind of comparisons that we do. And then we also give the picture. The picture isn't efficacy, it'd be the total tolerability, the total ability to understand the both risk and the benefit of the drug. So I hope that gives you a flavor of the kind of things we would present.

Yes, absolutely. Super helpful. And maybe if I could please ask one follow up. Will you be taking weight-based dosing into Phase 3 or will it be a fixed dose?

Yes, so one of the things that we've learned about this drug as an agonist, it's quite important to dose it very precisely. And so weight-based dosing is what we've identified is critical. So our plan is to continue to use weight-based dosing. And it's pretty common. There are many, many drugs that are dosed what you call weight bands. So if a person is between weight A and weight B, they get this, they get this SKU or another SKU, for example, Orencia other drugs, many other drugs are dosed that way. So we would be using weight-based dosing and then our long term goal would be also that we would launch, in an auto injector and maintain that kind of weight-based banding as our dose approach.

Great, thanks so much for taking the question.

Thank you. Our next question comes from Roger Song from Jefferies. Your line is open.

Great, thanks for the update and taking on question. Can you remind us what is the dropout rate for your Phase 1b atopic dermatitis trial? I understand the small, but what is the expectation for your Phase 2? Anything you can tell us on the blinded fashion? What is the discontinuation you are seeing? Would you report both ITT and [indiscernible] for the efficacy endpoint?

Yes. Hey Roger, thanks for the question. So you know, when we published the results from the Phase 1b last year in our Nature Communications paper, we showed that there was between a 30% and 20% dropout rate for placebo and the two dose levels of RE

Got it. Okay. And then in terms of the next step, given the Phase 2 is biologic naïve patient population, how would you consider to expand this into post biologics and then in the Phase 3? Thank you.

Yes. So our data is really built upon what we've seen in our own proof-of-concept study, right? And that's why we ran that Phase 1 in biologic naive patients, and we ran the Phase 2 biologic naive patients, and we would expect to also run our Phase 3 studies in the biologic naive patients. However, during the Phase 3 program, we would also study the drug in biologic experience. So that would be something that we would do as part of the Phase 3 program. Different companies use different approaches. For example, Amgen with the ROCA program combined biologic naive and experience into the same study, whereas lebrikizumab and amlitelimab did separate studies for those populations. So we'll still be deciding the best approach for us, but we will definitely evaluate both naive and experienced patient populations in the Phase 3 program.

Excellent. Just one last quick question. In terms of the partnership, would you be considering seeking partnership after Phase 2? Or you will take this RE

Yes, that's – this is Howard. That's a very good question, Roger. I think, look, if you look at Nektar's current financial position, we clearly aren't in a position to execute on a full Phase 3 program without a partner. So I think what we will be doing is looking at the quality and the strength of the data and we will be talking to companies about collaborating. Now that doesn't mean we'll be out licensing the drug. No way we will do that. But we will be talking to companies and come up with a collaboration that allows the least amount of dilutive financing for our investors and at the same point allows us to retain a significant portion of ownership of the drug. And there's lots of different ways to do that, but clearly collaboration is likely the direction we go.

Excellent. Thank you, That's it from us.

Thank you. Our next question comes from Mayank Mamtani from B. Riley Securities. Your line is open.

Yes, good afternoon. Thanks for taking our questions. J

Great. Yes. Thanks, Mayank. So obviously when we report the top line results, we'll give the detailed baseline EASI. But I can tell you that with the kind of prospective actions that we took in the study, such as the geographic footprint, as well as focusing on experienced dermatologists, board certified derms that have successfully participated in studies, we'd like to see our baseline EASI rate between 25 and 30. And we think that when you look across successful studies, whether they're Phase 2 or Phase 3, this is a – that's a very good zone to be in. You'll note of course from our publications, we were a little bit lower than that in our Phase 1. We were in 22, 23 range. Again, that was all U.S. sites. So we'd like to see a higher baseline EASI at this study. And then you asked another interesting question about the impact of increasing the time of – the overall dose interval. And we do think that that's quite important. So the Phase 1b was really informative and it showed us that a 12-week twice a month dosing regimen could definitely deliver quite a lot of efficacy and it could deliver a remitted effect that was seen in the majority of people. But it was also evident that there were people that could have done better with additional dosing. And when you look at that week 12 to week 19 off drug period, we lost a few people at the different dose levels that really had an effect, but then that effect winked. So there were clearly people that could have done with additional dosing. So one of the first things that we'll be looking at in this study is the additional extension of the induction period from 12 to 16 weeks. That also gives more, as you described space and the separation from placebo. But then also beyond that is the fact that we keep dosing in the maintenance period, which is also something that I mentioned, we're very excited about because it's possible we haven't really mapped out the extent of efficacy and that would continue treatment through 52 weeks. Patients could see even more benefits. So we're very excited to see the effect of that additional dosing. And then to your last question about the different dose levels. So we gave additional color in the call today about our expectations about the PK exposure and the kind of AUC that's matched across those dose levels. But also remember, this is a very well powered study. We enrolled 400 patients into the study in order to fill the maintenance arms. And then the benefit of that is that the induction is very well powered. So that gives us a very good opportunity and a very good chance to hit significance across multiple dose arms. Thanks for the questions, Mayank.

Great. And if I may squeeze in an alopecia study question, please. Do you have a sense of what proportion of patients between very severe versus severe subgroups? And if you could comment on the kinetics of response relative to a pretty fast onset, you get an AD, how – what would your expectation be on the kinetics there? And then I have just one last follow-up after that.

Sure. So just look at the epidemiology. If you look at people that are SALT 50 or higher, you'd find between a third and a half are actually in the very severe, which are 95 and higher, right? And those are also the people that tend to be the candidates for clinical trials as well. So that's just where the epidemiology breaks down in that from a third to a half are in that very severe category which is defined as 95 to 100 on the SALT scale. And then your other question about onset, it's a very interesting question. The physiology in that disease is very different, like in atopic dermatitis, you're dealing with effectively an organ that recovers quickly in the skin, rashes can come and appear and clear quickly, as you know. And so can the other excoriation, magnification [ph] other features of the disease as well. But hair is its own thing, right? There are different stages of hair growth. In patients with alopecia they have an arrest of the hair follicle. So there's inflammation that slows down and it really interrupts the stem cell portion of the disease. And so that's why we actually are doing a 36-week induction period in that study. We see that even with JAK inhibitors, right? It can take time to grow hair. So we are doing a longer induction period. And in December we look forward to present the top line results of that study. And there we'll be able to characterize not just the magnitude but also the connects of the response. So we'll stay tuned for until December for that.

Great. And just one corporate question. Anything you guys can comment on the Lilly litigation, just update on what next steps are and if at all respects progression to late stage development has any impact on potential damages? Thanks again for taking our question.

Yes. Look, I can't obviously can't go into detail on our litigation. I can only tell you that we strongly believe we've been damaged by Lilly and we are active. We're clearly actively pursuing an aggressive strategy in this legal action. And I think whether RE

Understood, thank you.

Thank you. Our next question comes from Arthur He from H.C. Wainwright. Your line is open.

Hey, good afternoon, Howard and team. Thanks for taking my question. So J

Yes, it's a really great question Arthur. Yes, thanks for that. So yes, one of the things we're going to learn in this Phase 2b study is what happens when we stop treatment. Right. So in the study design there's a nine month induction and then the six month off treatment period. And our hope and desire in designing the study that way was that we could see the same kind of remitted potential in alopecia that we saw in atopic dermatitis in that off drug period there. That would be a complete transformational change in this indication. So firstly there is no biologic approved in this disease. And the JAK inhibitors can be effective for people with alopecia. They're kind of difficult drugs to take because you have to take them for so long and this is easy. You also have to step up in dose in patients. But then as Howard and I described it, it's very difficult for patients because when you stop taking the JAK inhibitor the rate of hair loss is quick and you don't have a regrowth or a maintenance of what you grew. So we do think there's a really unique opportunity and again having the potential of being in a very, very exciting position as a biologic being tested and the potential to be so early into the space as a biologic therapy. The way we would approach a Phase 3 study, we would, of course, have to see the results of the Phase 2, right. We'd have to learn about the dose ranging that we've done in the Phase 2 study. And then as we look at the off drug period we would think about what is the appropriate maintenance regimen. Most likely we would treat and approach alopecia the way we approach atopic dermatitis, where there would be an induction period that would be a higher frequency of dosing and then there would be a maintenance period that would be much lower in frequency. That's most likely what we would see. But of course, we'd have to see the final results of the study to make that final design.

Thanks, J

It's the latter. So for those people, everybody gets 24 weeks off drug. So even if some people were improving at the end of week 36 and had an extension, they would still be followed for 24 weeks of the end of dosing. You are correct.

Okay, got it. Yes. Thanks for taking the question.

Thank you. Our next question comes from Jessica Fye from JPMorgan. Your line is open.

Hey guys, good afternoon. Thanks for taking my question. Is it fair to expect that you would wait for the 36-week AD data before pursuing an end of Phase 2 meeting with FDA and preparing to initiate a Phase 3 trial? Or is there potentially motivation to meet with the FDA sooner on the back of this upcoming data and get the ball rolling on Phase 3 that much sooner? Thank you.

Yes, thanks for the question, Jess. It is the latter. So we don't have to wait for the completion of the maintenance, which would come in a very early part of next year before we connect with the FDA on the induction regimen. And so in fact it is our plan that with the top-line data that comes next month, we would begin eyeing in the – Phase 2 meeting with that 16 week induction data being the main substance and substrate as well as the driver of the Phase 3 study design that we would take forward. So yes, actually we would, you don't need to wait. And our goal would be to really to keep the momentum, on the program. So if the study gives us the kind of results, that we think it can, our intention would be to move quickly, maintain the momentum and i.e. Phase 3 moving into that Phase 3 program as quickly as we can.

Great. Thank you.

Thank you. Our next question comes from Andy Hsieh from William Blair. Your line is open.

Oh, thanks for taking our questions. So, two for me. I'm just curious, for the protocol for atopic dermatitis, do you allow patients to be off the drug but still on the trial? The reason why I'm asking this question is perhaps for the first look, you can potentially get a glimpse into potential remittance, like you said, J

Okay, sure. Yes. So in terms of your first question, so like any other protocol, right, there are rules for either stopping the study or stopping the treatment. Right. And then there are, if you fall into one of those categories, like any other protocol, you still keep the patients in the study. They continue to have follow-up visits, not just an end of study, but even after an end of treatment, they could continue to be followed. And so our protocol is no different than any others and it does allow that. And again, like so, yes, so that's something that is allowed in our protocol. And then the second question that you asked was about imputation. And so, yes, the kind of imputation methods that are used are typical of Phase 2 studies. So the FDA likes you to use an estimate approach, when you report this kind of data. So there are events called intercurrent events, and again, they're well defined. And the FDA gives the guidance to all sponsors when you have a study of Phase 2 size. So we'd be using a primary estimate analysis and again, the routine kind of imputation methods that are typical of other studies. When we present the results, we'll get into the details. The methodology, so you can see that before you see the protocol, for example, when we publish the study results. But I hope that gives you the kind of flavor it's a standard imputation of primary estimate analysis.

Yes, that's helpful. Thank you, J

Thank you. And I am showing no further questions from our phone lines. I'd now like to pass it back to Howard Robin for any closing remarks.

Well, thank you all for joining us today and we greatly appreciate your continued support. And I want to thank all of our employees for their hard work and diligence. And I look forward to sharing our RE