On April 24, 2023 IN8bio, Inc. (Nasdaq: INAB), a clinical-stage biopharmaceutical company developing innovative gamma-delta T cell therapies, reported new positive data from the Phase 1 investigator-sponsored trial of INB-100 in leukemia patients (Press release, In8bio, APR 24, 2023, View Source [SID1234630429]). The data presented at the 49th Annual Meeting of the European Society for Blood and Marrow Transplantation (EBMT) showed that 100% of evaluable patients (n=7) treated with INB-100 remained alive, progression-free, and in durable complete remission (CR) as of April 21, 2023, indicating the curative potential of INB-100 for high-risk or relapsed AML and other hematologic malignancies undergoing hematopoietic stem cell transplantation (HSCT).
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"We are thrilled to report that 100% of evaluable dosed patients remain in morphological CR with the first three high-risk AML patients with complex cytogenetics now alive and relapse-free, with one patient surviving for as long as 3 years," said Dr. Trishna Goswami, IN8bio’s Chief Medical Officer. Further, "INB-100 has demonstrated, for the first time, in vivo expansion and persistence of an allogeneic, or donor-derived cellular therapy at the higher levels associated with greater survival outcomes."
The latest data on immune reconstitution presented at EBMT showed significant allogeneic gamma-delta T cell expansion and persistence in patients through the first 180 days post-treatment. Patients who received INB-100 treatment at Dose Level 2 exhibited an average of 82.9x greater gamma-delta T cell expansion at 60 days compared to patients undergoing haploidentical HSCT without INB-100 therapy. The gamma-delta T cell levels in Dose Level 2 patients are also, on average, 12.8x greater than those achieved in Dose Level 1, demonstrating a dose-response related to the gamma-delta T cell infusion. Elevations in CD4+, CD8+ T cells, NK cells and B cells have also been observed, indicating a broad positive immune response.
The study’s updated safety data reported low-grade (1-2) graft versus host disease (GvHD) in all patients treated, which was steroid-responsive, and had a more rapid onset at higher dose levels. No dose limiting toxicities (DLTs) have been observed. As of April 21, 2023, all evaluable patients across Dose Levels 1 and 2 remained on study and in CR, with one patient remaining progression free for over 3 years. Additional treated patients have remained progression free for 33.9, 22.2, 7.8, 5.8, 5.6 and 2.6 months, respectively.
"The data that continue to emerge from this clinical trial are very encouraging and suggest that INB-100 may offer a new treatment option for this high-risk population," said Dr. Joseph McGuirk, the Schutte-Speas Professor of Hematology-Oncology, Division Director of Hematological Malignancies and Cellular Therapeutics and Medical Director, Blood and Marrow Transplant at The University of Kansas Cancer Center and the Principal Investigator on the study. "While the data are early, it is encouraging that all evaluable treated patients have shown positive clinical outcomes and durable responses, particularly in light of the high-risk and complex cytogenetics of these patients."
The positive outcome of ongoing durable patient CRs, combined with the benefit/risk profile, led to the decision to select Dose Level 2 as the RP2D. The trial is being expanded at this dose level, and additional patients are actively being enrolled and treated in the study, with updated data expected to be presented at a medical meeting later this year.
Conference Call Details
IN8bio will host a conference call and webcast today, April 24, 2023, at 10:00 a.m. ET to review the updated data from the EBMT presentation, as well as recent clinical updates. The webcast can be accessed by clicking the link: View Source and can also be accessed on the Events & Presentations page of the Company’s website.
About the INB-100 Phase 1 Trial
The Phase 1 clinical trial (NCT03533816) is an investigator-sponsored dose-escalation trial of allogeneic derived, gamma-delta T cells from matched related donors that have been expanded and activated ex vivo and administered systemically to patients with leukemia following HSCT. The single-institution clinical trial is currently being conducted at The University of Kansas Cancer Center (KUCC). The primary endpoints of this trial are safety and tolerability, and secondary endpoints include rates of GvHD, relapse rate and overall survival.