“…The main targets of the ICIs include cytotoxic T-lymphocyte-associated protein 4 (CTLA-4), programmed cell death protein-1 (PD-1), and programmed cell death ligand-1 (PD-L1). Monoclonal antibodies, including anti-PD-L1 inhibitors (e.g., atezolizumab, durvalumab, and avelumab), anti-PD-1 inhibitors (e.g., pembrolizumab and nivolumab), and CTLA4 receptor inhibitors (e.g., ipilimumab and tremelimumab), have been approved by the FDA for several solid tumor treatments [ 30 , 31 ]. ICI monoclonal antibodies, as single drugs or combination strategies, were studied in PDAC clinical trials [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ].…”