Jonathan Zalevsky
Analyst · William Blair. Your line is open
Thank you, Howard. Let’s begin today with REZPEG, which is the most advanced IL-2 based T reg mechanism in the field. Across the REZPEG studies that have been conducted to date, we have observed a consistent and highly predictable clinical pharmacology profile with respect to target engagement as well as the peak and duration of T reg mobilization. It has demonstrated a well-tolerated safety profile and clear clinical efficacy in atopic dermatitis and also psoriasis and in patients with cutaneous manifestations of lupus. Our deep experience with REZPEG to date across the totality of this clinical program gives us convictions in our ongoing Phase 2b studies in atopic dermatitis and alopecia areata. This specifically in atopic dermatitis, there are three important issues that patients with this disease continue to face: first, there is a need for great efficacy, specifically a deeper magnitude of response and rapid onset of treatment; second, patients lack durable responses and therapy-free remission. Once current therapies are discontinued, the patients rebound rapidly; and third, treatments with favorable safety profiles are lacking. This is especially important giving the chronic nature of the disease and the need for continuous dosing. We believe there are major opportunities in this disease state that the differentiated profile of REZPEG could potentially address. Diving into our Phase 1b data in atopic dermatitis, through the 12-week induction period, REZPEG demonstrated dose-dependent efficacy across both physician-assessed and patient-reported efficacy measurements, reaching statistical significance across many of these measures. At the highest dose level, REZPEG demonstrated a very rapid onset of response, with over 40% of patients achieving EASI-75 by week 3 after only 2 doses of REZPEG. This rapid onset of action rivals that of JAK inhibitors, which have outperformed Dupilumab at this parameter. At the end of the induction period of 12 weeks, we observed a profound magnitude of efficacy, an 83% reduction in percent change from baseline EASI score with the highest dose tested. This is the largest magnitude of change that we’ve seen for a biologic and outside of one JAK inhibitor. Importantly, we are encouraged by the extended durability seen from REZPEG. Long after the completion of the 12-week induction period, many patients maintain durable disease control for an additional 36 weeks after end of dosing. And this type of extended disease control after the end of dosing is not observed for Dupilumab or for JAK inhibitors. Durability of the EASI-75 response was observed with approximately 70% of EASI-75 responders maintaining that response for 36 weeks after the end of the 12-week induction period. This is a very exciting result and suggests that REZPEG has the potential to be the first remitted therapy for atopic dermatitis. For both patient-reported outcomes and physician-assessed endpoints, we observed these same trends, rapid onset of effect, dose dependence, and long durability of control. Additionally, REZPEG was well-tolerated and treatment with REZPEG did not induce anti-drug antibodies in patients, which has been reported with some examples of the IL-2 mutein class. These promising data have us and KOL’s very enthusiastic about the potentials for long-lasting responses and infrequent maintenance dosing with REZPEG in the setting of atopic dermatitis. In October 2023, we initiated the Phase 2b study of REZPEG in biologic-naive atopic dermatitis patients, and enrollment is well underway. Our goal is to enroll roughly 400 patients with three different regimens of REZPEG versus placebo, evaluated over a 16-week induction period. After the induction period, patients that meet a threshold to advance from induction to maintenance will be re-randomized into one of two maintenance regimens at different dosages at either once a month or once every three-month dosing and that schedule will continue for another 28 weeks. Our enrollment for this study is on track and we expect data in the first half of 2025. Moving to alopecia areata, we believe REZPEG has strong scientific rationale this indication. alopecia areata is also a disease of the skin, where your immune system starts to attack the hair follicles, thereby, weakening the ability of stem cells to grow hair. With prolonged immune attack, this eventually causes the hair follicle to release the hair altogether leading to patchy hair loss and as the disease progresses to baldness. Biologically speaking REZPEG through its central pathway of T reg rescue, which is uniquely poised to address the diversity of immunopathology, providing broad potential for targeting multiple dermal diseases, including alopecia. For example, in alopecia, there are almost no immune cells in normal hair follicles, meaning the hair follicle is an immuneprivileged tissue. T regs are very important in maintaining that immuneprivilege, and people with alopecia areata develop a breakdown of that immuneprivileged state. We think the T reg mechanism of REZPEG can restore immuneprivilege and could provide durable disease control, which we believe would be game changing in this indication. JAK inhibitors are the only agents approved in alopecia, and they do not provide disease durability after a patient’s discontinuous treatment. With JAK inhibitors, it could take a patient anywhere from of 9 to 18 months to grow hair. And once the patient stops taking a JAK inhibitor, which may happen for a variety of reasons, including toxicity, their hair falls out again rapidly. There is a high unmet need in this patient population for tolerable treatment options that provide durable responses. And we believe that restoration of immuneprivilege is key to obtain durability. For these reasons, we believe there’s an opportunity for REZPEG to become a novel biologic therapy in alopecia areata. We are initiating a Phase 2b study of REZPEG in alopecia this month. The Phase 2b study plans to recruit roughly 80 patients with severe to very severe alopecia, who will be randomized to REZPEG or placebo. Patients will be treated for a period of 36 weeks and observed up to 60 weeks in total. Our primary endpoint for this study is mean percent improvement in SALT or the severity of alopecia tool at week 36, which is the validated outcome measure used for regulatory approval. We will also be looking at a number of other secondary endpoints, including proportion of patients who saw a reduction in SALT. Now, turning to NKTR-0165, our TNFR2 agonist antibody. TNFR2 is highly expressed on T reg myeloid suppressor cells, regulatory B cells, neuronal cells and others, and TNFR2 agonism has been shown to potentiate the suppressive effect in overall functional properties of T reg and these other suppressive cell populations. If TNFR2 is absent, it is associated with autoimmunity and other genetic conditions that resemble FoxP3 loss of function. In contrast, its presence has been associated within immunoregulatory function and protective effects for multiple cell populations and tissues in the body. This TNFR2 agonist program in our pipeline is built upon many years of T reg experience gained from REZPEG. For example, we know that central T regs, such as thymic T regs, require a substantial JAK-STAT signal that is physiologically provided by the IL-2 receptor pathway, and this is a central theme in the mechanism of action of REZPEG. In contrast, T regs that leave the central compartment and infiltrate the distal organs and tissues, they are less dependent on the JAK-STAT pathway and instead ship their reliance onto NF-kappa B pathway engagement for their maintenance of suppressive function. TNFR2 is the most abundant TNS superfamily member expressed on T regs, and the key driver of NF-kappa B signaling in those cells. And consequently, a bona fide TNFR2 agonist would be an incredibly exciting addition to our pipeline. Examples of indications that could be addressed by TNFR2 agonism include multiple sclerosis, mucosal immunology conditions such as ulcerative colitis of the GI or other oral mucosa diseases and even dermal autoimmune diseases like vitiligo. We have identified several LEAD [ph] TNFR2 antibody program from an artificial intelligence-based antibody discovering campaign with our partner Biolojic Design. The LEAD antibody is called NKTR-0165 and it has highly desirable properties including exquisite TNFR2 cell activity, TNFR2 agonism in primary human cells, activity in multiple preclinical efficacy models, and a very well-tolerated profile in early non-GLP toxicology studies. We have developed a manufacturing cell line for the LEAD, and are conducting upstream and downstream process development with the aim to enter the clinic for this program in the first half of 2025. Later this year, we plan to present the first preclinical data for NKTR-0165 at an upcoming medical conference. As we move forward with our IND-enabling studies, there is growing interest for a novel selective TNFR2 agonist like NKTR-0165, and thus we remain open to the opportunity of working with companies that have interest in these areas to strategize on the best path forward. Now, let’s switch gears to our IL-15-based oncology program, NKTR-255. NKTR-255 is IL-15-based mechanism of action holds a great promise as a combination agent of cell therapies and other mechanisms such as checkpoint inhibitors, and we are exploring the best partnering paths for continued development of this drug candidate. Our Nektar-sponsored trial, combining NKTR-255 with the approved CD19 CAR-T’s BREYANZI and YESCARTA for treatment of patients with a large B-cell lymphoma, has enrolled 15 patients in the dose-escalation portion of the study. The combination of NKTR-255 in BREYANZI is also being studied in a separate investigator-sponsored trial at Fred Hutch. We are targeting the potential submission of data from these studies at medical meetings in the second half of this year. A clinical trial in non-small cell lung cancer sponsored and funded by AbelZeta, which evaluates the combination of AbelZeta’s tumor infiltrating lymphocyte cell therapy, plus NKTR-255, and check point inhibitor is also ongoing and enrolling patients. And with our partner, Merck KGaA, we have also been evaluating NKTR-255 in combination with BAVENCIO versus single-agent BAVENCIO in the Phase 2 JAVELIN Bladder Medley study. And that study is on track to potentially report interim PFS data later this year. And with that, I will turn the call over to Sandy, for a review of our financial guidance. Sandy?