AbClon presented non-clinical and phase 1 interim results of its AT101 novel CAR-T therapy at the annual 2023 AACR conference. AT101 targets the CD19 protein for treatment of blood cancer. AT101 demonstrated superior anti-cancer efficacy compared to FMC63-based CAR-T therapies in non-clinical data.

AT101 utilizes the H1 218 antibody, developed through AbClon's Novel Epitope Screening Technology (NEST), and binds in a unique manner to CD19. AT101 demonstrated efficacy even in CD19 mutant cancer cell models that did not respond to FMC63-based CAR-T therapies. Overall, AT101 has the potential to provide new treatment opportunities for patients including those who do not respond to currently available CAR-T therapies.

An open-label, non-randomized, multicenter phase 1 study was conducted at three different dose levels in patients with relapsed /refractory B-NHL. The results of the first two dose levels in Phase 1, low and medium, have been determined. For medium dose, although the dosage administered to patients is lower than that of currently available CAR-T therapies, all three patients achieved complete response (CR) four weeks after administration.

Even at 5-fold lower dosage to medium dose, CR was observed in 3 out of 6 patients and partial response (PR) was observed in 2 patients. Cytokine release syndrome (CRS) and neurotoxicity (ICANS), which appear as side effects of CAR-T therapy, were also observed at low levels of 11.1% and 22.2%. In particular, the rate of 3 or higher grade on side effects was 11.1%, showing encouraging signs with regard to safety.

Clinical trial of high dosage level is currently in progress. AT101 was administered to patients with diffuse large B cell lymphoma (DLBCL), follicular lymphoma (FL), mantle cell lymphoma (MCL), and marginal zone lymphoma (MZL). Effective responses to AT101 potentiate the application of AT101 for different types of hematologic malignancies.

Research teams led by Professor Marco Ruella of Perelman School of Medicine at University of Pennsylvania, Professor Junho Chung of Seoul National UniversityCollege of Medicine, and Professor Dok hyun Yoon of Asan Medical Center are participating in this study. AbClon owns independent intellectual property rights for the technologies applied to AT101 and is currently building channels for global expansion with local partners. AT101 patent registration has been completed in U.S., Canada, Japan, and South Korea.

Further registrations are underway in Europe and China.