Jonathan Zalevsky
Analyst · OpCo. Your line is open
Thanks, Brian. Our therapeutic candidate NKTR-255 is an agent that engages the full biology of the IL-15 pathway to provide functional activation and homeostatic control of IL-15 responses of immune cells, namely natural killer cells, CD8 T-cells and immune memory subsets. As a full agonist of the IL-15 pathway that can signal to both this and transpresentation, the trimeric IL-15 receptor complex; NKTR-255 can be combined with multiple mechanisms ranging from targeted agents to cell therapies including CAR-T, and even checkpoint inhibitors to potentially improve the efficacy of these agents. We are pleased to be presenting the first data for NKTR-255 in combination with DARZALEX, in patients with multiple myeloma at ASH. This combination study of NKTR-255 with DARZALEX is a key biological proof of mechanism study for NKTR-255, because of the unique consequences of the DARZALEX mechanism of action. DARZALEX is the CD38 targeting antibody that depletes CD38 positive cells through ADCC mechanism. DARZALEX is effective for the treatment of multiple myeloma, because stem cells, which are the pathogenic tumor cells in multiple myeloma, express CD38 on their cell surface, and are effectively targeted and depleted by DARZALEX. However, NK cells also express CD38 on their cell surface, and these cells are also directly targeted and depleted by DARZALEX. And since NK cells are the critical immune effector cells that execute the ADCC mechanism, and emerging hypothesis is that restoring NK cell levels during DARZALEX treatment may be beneficial. Consistent with this hypothesis, last summer, we published a paper in Blood Advances with our collaborator, Dr. Nikhil Munshi at Dana-Farber that showed NKTR-255 when used in combination with DARZALEX. Substantially potentiated the efficacy of DARZALEX against multiple myeloma cells in a number of in vitro and in vivo preclinical models. As mentioned by Howard, we’re very encouraged to see that the early patients in the NKTR-255 and DARZALEX combination, demonstrating NK cell recovery in the peripheral blood within days after starting NKTR-255 administration. This proof of mechanism study is continuing to enroll patients. And as we stated in the past, we will wait to assess the mature data from dose escalation before making a final determination on any investment in future ADCC combination work in this setting. We are also focused on pursuing NKTR-255 into potentiator in the landscape of cell therapy. Since their first approvals years ago, the usage of autologous CD19 chimeric antigen receptor T cells or CAR-T therapy has grown significantly in the B-cell lymphoma treatment landscape. Although, these therapies offer great treatment benefit for those patients who fail first or second line treatment, many patients tend to relapse over time post-treatment with CAR-T. And there is a high unmet need to provide both an extended duration of response and to drive a higher frequency of complete responses. We have done a large number of preclinical studies using multiple autologous CAR-T therapy. Demonstrating the addition of NKTR-255 can drive cell proliferation and expansion in the presence and absence of antigen as well as maintain CAR-T cell functionality and sustain their survival by limiting cell death pathways. In multiple miles [ph] to preclinical study, the combination of NKTR-255 plus CAR-T is far more effective than CAR-T alone and clearing tumors using a graph models. The consequently, our clinical hypothesis is that the addition of NKTR-255 to the CAR-T regimen may increase CAR-T cell levels leading to enhanced efficacy. As Howard said earlier, we are on track to initiate the Nektar sponsored study of NKTR-255 combined with approved CAR-T therapy. Next month at ASH, we will unveil the trial design of this Phase 2/3 study in patients with relapsed or refractory diffuse large B-cell lymphoma. The goal of this study is to generate comparative data with NKTR-255 plus CAR-T cells versus placebo plus CAR-T cells. Our target is to initiate the first clinical sites in the study by the end of this year. And as Howard stated earlier, we are expecting initial data in the second half of 2024. We already have two studies underway with external collaborators to evaluate NKTR-255 in combination with CAR-T therapy. The first study is sponsored by Dr. Crystal MaCkall, who is the Founding Director of the Stanford Center for Cancer Cell Therapy and is combining Stanford’s proprietary CD19, CD22 bi-specific CAR-T cell therapy with NKTR-255 in patients with relapsed or refractory acute lymphoblastic leukemia. The second study is being conducted by Dr. Cameron Turtle’s Lab at Fred Hutchinson Cancer Center. Fred Hutch is combining NKTR-255 with [Brian’s team] [ph], and relapsed or refractory large B-cell lymphoma patients. The goal of these 2 studies is to demonstrate the pharmacodynamics and safety of NKTR-255 cell CAR-T therapy in patients. Specifically, our objective is to demonstrate the NKTR-255 promotes CAR-T cell expansion and duration of persistence with repeated treatments. Additionally, the studies will assess the full safety profile of NKTR-255, when beginning the treatment shortly after the start of CAR-T cell therapy. We expect to have results from the first several patients in the study in 2023. Another focus area for our development plan for NKTR-255 is the work being conducted with Merck KGaA, who was initiated the JAVELIN Bladder Medley study. This Phase 2 randomized open-label study is comparing avelumab combinations with 3 antitumor agents; NKTR-255, Fidelvi [ph], and one of Merck’s owned anti-TIGIT therapeutic candidates. Tested in the setting of maintenance treatment for bladder cancer in patients, whose disease has not progressed following the platinum regimen. Avelumab is annualizing at about $500 million revenue run rate in this setting, and the study gives NKTR-255 a possible path to a future registrational trial in this setting, based upon the strength of the data generated in this Phase 2 study. We expect the first potential PFS data from Phase 2 study in late 2024. Now, turning our attention to our preclinical research programs. We are cultivating our research pipeline with the near-term focus on biological programs that have applications in oncology and immunology. One of the programs we are working on is NKTR-288, a PEG conjugate of the protein interferon gamma. Interferon gamma is a cytokine that induces cellular antigen presentation and enhances tumor antigens specific cytotoxic T cell responses, and may have application in a number of therapeutic areas including oncology, infectious disease and others. With NKTR-288, we have designed a site-specific conjugate of PEG’s protein in order to modify binding of interferon gamma both with its beta receptors, as well as other binding substrate covered. Overall, this design enhances and prolongs the pharmacodynamic duration of interferon gamma signaling. In our preclinical studies, NKTR-288 upregulated MHC class 1 and PD-L1 expression on tumors, and enhance the antitumor activity and mouse models, when combined with anti-PD-1 or PD-L1, and also worked as a single agent. We look forward to presenting you an additional data for our NKTR-288 program at SITC next week. We are also continuing our preclinical work on our Tumor Necrosis Factor Receptor 2 Program or the TNFR2 program in collaboration with biologic design. The goal of this program is to generate novel antibodies that are selective agonists of TNFR2. TNFR2 is the key receptor that signals exclusively through transmembrane TNF-alpha to suppress inflammation and promote tissue protection and repair. One key role of TNFR2 is to promote Treg stability, homeostasis and function in diverse anatomical tissues. We have leveraged our understanding of Treg biology, and in particular, their responsiveness to IL-2 signaling versus NF-kappa B signaling to drive the TNFR2 antibody discovery in collaboration with biologic design. A TNFR2 agonist could have application for a number of autoimmune inflammatory diseases, including multiple sclerosis, inflammatory bowel disease, arthritis, as well as antibody mediated autoimmune diseases. We look forward to keeping you updated on our progress if this program matures. And with that, I will turn the call over to Jill for a review of our financial guidance. Jill?