ATOR-1017 (evunzekibart), an Fc-gamma receptor conditional 4-1BB agonist designed for optimal safety and efficacy, activates exhausted T cells in combination with anti-PD-1.
Enell Smith, K., Fritzell, S., Nilsson, A., Barchan, K., Rosen, A., Schultz, L., Varas, L., Sall, A., Rose, N., Hakansson, M., von Schantz, L., Ellmark, P.(2023) Cancer Immunol Immunother 72: 4145-4159
- PubMed: 37796298 
- DOI: https://doi.org/10.1007/s00262-023-03548-7
- Primary Citation of Related Structures:  
8OZ3 - PubMed Abstract: 
4-1BB (CD137) is a co-stimulatory receptor highly expressed on tumor reactive effector T cells and NK cells, which upon stimulation prolongs persistence of tumor reactive effector T and NK cells within the tumor and induces long-lived memory T cells. 4-1BB agonistic antibodies have been shown to induce strong anti-tumor effects that synergize with immune checkpoint inhibitors. The first generation of 4-1BB agonists was, however, hampered by dose-limiting toxicities resulting in suboptimal dose levels or poor agonistic activity.
Organizational Affiliation: 
Alligator Bioscience AB, Lund, Sweden.