On September 19, 2024 Biosyngen, an innovative biotechnology company specializing in immune cell therapies, reported its groundbreaking "Conditional Activation + Armor Enhancement" T-cell technology at this year’s ESMO (Free ESMO Whitepaper) conference (Press release, BioSyngen, SEP 19, 2024, View Source;armor-enhancement-super-t-technology-at-esmo-2024-302253153.html [SID1234646754]).
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Biosyngen has secured ten clinical trial approvals in China and the U.S. for its innovative fourth-generation oncology therapies. Currently, our leading pipeline product, BRG01, is in the pivotal Phase II clinical trial stage for solid tumors. Additionally, the first patients have been enrolled in the Phase I trials for our other groundbreaking therapies, BST02 and BRL03, with completion of Phase I trials anticipated later this year.
Abstract Title
Anti-tumor Efficacy and Safety of Conditionally Activated Armored CAR-T Cells against Gastrointestinal Tumor
Title No.
1033P
Gastrointestinal tumors have been found to exhibit significantly elevated levels of tumor-associated antigens (TAAs) compared to normal tissues, presenting potential targets for immune cell therapies. However, these TAAs are also expressed at certain levels in normal tissues, which poses a challenge for CAR-T cell therapies. Current CAR-T cells often fail to distinguish between tumor and normal tissues, leading to damage to normal organs and adverse clinical reactions. This on-target off-tumor toxicity not only raises safety concerns in clinical treatment but also limits dosage and efficacy enhancement.
To overcome this technical challenge and balance safety with efficacy in solid tumor immune cell therapies, Biosyngen has developed the SUPER-T T cell safety optimization platform and created the Conditional Activation CAR-T cell BTRP003L. This technology allows CAR-T cells to activate only under hypoxic conditions typical of the tumor microenvironment (0.3% ~ 2.0% O2), while remaining inactive in normal tissues (3.4% ~ 6.8% O2). Remarkably, this approach not only regulates CAR-T cell activation levels under different conditions effectively but also enhances their antitumor capabilities (Figure 1). Further advancements include the co-expression of a TGFβRII dominant-negative mutant, resulting in the "Conditional Activation + Armor Enhancement" CAR-T cell BTRP011L, which shows improved efficacy and in vivo persistence at lower doses (Figure 2). Toxicology studies using the SUPER-T platform showed no weight loss or other adverse effects in mice injected with BTRP003L or BTRP011L, demonstrating robust safety.