On March 3, 2025 IN8bio, Inc. (Nasdaq: INAB), a clinical-stage biopharmaceutical company developing innovative gamma-delta (γδ) T cell therapies, reported INB-600, its potentially breakthrough next generation γδ T cell-based TCE platform. It is designed to address one of the biggest shortcomings of current existing γδ TCEs – insufficient numbers of γδ T cell effector cells to drive real clinical impact (Press release, In8bio, MAR 3, 2025, View Source [SID1234650830]). This groundbreaking platform leverages γδ T cells’ unique properties targeting applications in both oncology and autoimmune indications with potentially greater safety and tolerability than current CAR-T and TCE approaches.

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The platform’s first candidate, INB-619, targets CD19, a key marker broadly found on B cells, which play a central role in leukemias, lymphomas, and autoimmune diseases. In preclinical models, INB-619 demonstrated:

Rapid and sustained B-cell depletion – target cells were eradicated as γδ T cells continued expanding up to 450-fold with continued proliferation until the target cells were undetectable.
Simultaneous expansion and activation of both major γδ T cell subsets (Vδ1+ and Vδ2+) leverages both the rapid antigen presenting properties of Vδ2+ T cells and the longer-term resistance against exhaustion and tissue residence properties of Vδ1+ T cells, potentially resulting in deeper B cell depletion.
Lower cytokine (IL-6) secretion, potentially reducing the risk of dangerous side effects such as CRS and ICANs, two of the most severe side effects limiting CAR-T and traditional CD3-TCE adoption in autoimmune indications.
William Ho, Chief Executive Officer and co-founder of IN8bio, commented, "As the industry rapidly chased immunology and inflammation (I&I) indications, we saw a major unmet need for a therapy that provides deep B cell depletion, ease of delivery with no required lymphodepletion, and improved overall safety and tolerability. Most γδ TCEs have failed because they can’t engage the limited number of effector cells to eliminate their targets. Our INB-600 platform is working to change the equation by not only targeting B cells, but also by actively expanding the γδ T cell immune army needed for deep, lasting B cell depletion. By leveraging our expertise in γδ T cell biology, we have worked to develop a breakthrough technology that combines exceptional preclinical potency, while broadly expanding immune surveillance and potentially avoiding the dangerous side effects of existing approaches. We believe this platform could have significant applications across oncology as well as autoimmune diseases."

TCEs are a class of bispecific antibody therapies that work by binding both a target cell and a T cell, bringing them into close proximity so the T cell can efficiently attack and destroy its target. Traditional TCEs, such as those targeting CD3 – have demonstrated strong target killing abilities but often have severe limitations, including the potential to drive T cells to exhaustion and induce severe toxicities such as CRS and ICANs. γδ T cells naturally secrete lower levels of inflammatory cytokines such as IL-6, which suggests substantially less risk of CRS, which may translate to improved safety and tolerability in future clinical applications. Notably, to date, IN8bio has not observed any CRS or neurotoxicities in any of its on-going γδ T cell clinical programs.

IN8bio plans to evaluate INB-619 in preclinical studies and seek potential partners to support future IND-enabling trials. We remain focused on to pushing the boundaries of next generation γδ cell-based immunotherapies as it pursues its mission of Cancer Zero – a future where cancer is fully eliminated.

Webcast details
TD Cowen 45th Annual Health Care Conference
Date/Time: Monday, March 3, 2025, at 10:30 a.m. ET.
Webcast link: https://wsw.com/webcast/cowen177/inab/1991262

A live webcast and replay will also be available under "Events and Presentations" in the News & Presentations section of the IN8bio website at View Source