On February 17, 2026 TuHURA Biosciences, Inc. (NASDAQ:HURA) ("TuHURA" or the "Company"), a Phase 3 immuno-oncology company developing novel therapeutics to overcome resistance to cancer immunotherapy, reported that it has filed an Investigational New Drug Application (IND) with the U.S. Food and Drug Administration’s (FDA) Division of Hematologic Malignancies 1 (DHM1) for the study of TBS-2025, a novel VISTA inhibiting antibody, for the treatment of mutNPM1 relapsed/refractory (r/r) Acute Myeloid Leukemia (AML) in combination with a menin inhibitor.
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The Company plans on initiating a Phase 2 study in menin inhibitor naïve patients with mutNPM1 r/r AML utilizing a Simon 2 stage design. Pending completion of FDA review and clearance, the Company currently targets initiating the Phase 2 study in early Q2 2026 with preliminary Stage 1 results in Q3 2026.
"There is a broad body of scientific evidence showing that leukemogenic mutations common in AML, such as mutNPM1, may drive the expression of VISTA on the surface of leukemic cells, which contribute to low response rates to therapy and markedly reduced overall survival," said Dr. James Bianco, President and Chief Executive Officer of TuHURA Biosciences.
"While the introduction of menin inhibitors for the treatment of mutNPM1 r/r AML has provided these patients with the first approved therapy, CR/CRh rates across the class are generally <25% and of short duration, underscoring the continued unmet medical need." Dr. Bianco continued, "Given the strong scientific rationale, we believe adding TBS-2025 to a menin inhibitor may markedly increase both the CR/CRh rate and its duration, potentially addressing this unmet medical need. If successful, the Company would seek FDA guidance on the potential for developing TBS-2025 under FDA’s accelerated approval pathway."
About TBS-2025
TBS-2025 is a unique VISTA-inhibiting monoclonal antibody acquired by the Company in its acquisition by merger with Kineta Inc. on June 30, 2025. VISTA is a novel checkpoint expressed on quiescent (resting) T cells and highly expressed on myeloid cells. Unlike the expression of VISTA on solid tumor cancers, its role is well established in hematological malignancies. Scientific evidence demonstrates that mutNPM1 and mutDNM3TA, two of the most common mutations in AML and other myeloid (blood related) malignancies, may drive the expression of VISTA on leukemic blasts and are reported to be the primary mechanisms by which AML has a poor response to and high relapse rate following current therapies. VISTA expression is linked to high relapse rates in AML due to its ability to allow leukemic blasts to evade immune recognition and attack by the patient’s immune system. When VSIR, the gene that encodes for VISTA, is removed in murine models of mutNPM1 AML, an immune response is observed and survival is enhanced.
TBS-2025 was initially investigated by Kineta in a large Phase 1 trial either as monotherapy (n=24) or in combination with pembrolizumab (n=15) among patients with advanced, therapy refractory cancers, including breast, lung, colorectal, and ovarian cancer. The purpose of the study was to investigate its safety profile and determine the recommended Phase 2 dose. The drug demonstrated a favorable safety profile even at the highest dose level of 1,000mg administered every two weeks. Based on pharmacokinetics and pharmacodynamics, the Company believes the optimal Phase 2 dose is 750mg every three weeks.
(Press release, TuHURA Biosciences, FEB 17, 2026, View Source [SID1234662736])