ICIs unleash immune brake responses and effectively inhibit tumor immune escape by targeting programmed cell death 1 (PD-1) and its ligand (PD-L1), lymphocyte-activating gene-3 (LAG3), cytotoxic T lymphocyte-associated antigen-4 (CTLA-4), and other targets [18, 22, 23]. Here, CTLA4 is linked to neoplasm.