Several immune checkpoints associated with tumour immunity have been identified, including cytotoxic T-lymphocyte antigen 4 (CTLA-4), programmed death 1 (PD-1), programmed death ligand 1 (PD-L1), T-cell immunoglobulin and mucin-domain containing protein-3 (TIM3), and lymphocyte activating 3 (LAG3), among others [84–87]. Here, HAVCR2 is linked to neoplasm.