Brajesh P Kaistha, Gozde Kar, Andreas Dannhorn, Amanda Watkins, Grace Opoku-Ansah, Kristina Ilieva, Stefanie Mullins, Judith Anderton, Elena Galvani, Fabien Garcon, Jean-Martin Lapointe, Lee Brown, James Hair, Tim Slidel, Nadia Luheshi, Kelli Ryan, Elizabeth Hardaker, Simon Dovedi, Rakesh Kumar, Robert W Wilkinson, Scott A Hammond, Jim Eyles
CD73 is a cell surface 5'nucleotidase (NT5E) and key node in the catabolic process generating immunosuppressive adenosine in cancer. Using a murine monoclonal antibody surrogate of Oleclumab, we investigated the effect of CD73 inhibition in concert with cytotoxic therapies (chemotherapies as well as fractionated radiotherapy) and PD-L1 blockade. Our results highlight improved survival in syngeneic tumor models of colorectal cancer (CT26 and MC38) and sarcoma (MCA205). This therapeutic outcome was in part driven by cytotoxic CD8 T-cells, as evidenced by the detrimental effect of CD8 depleting antibody treatment of MCA205 tumor bearing mice treated with anti-CD73, anti-PD-L1 and 5-Fluorouracil+Oxaliplatin (5FU+OHP)...
December 31, 2024: Cancer Biology & Therapy