Other mAbs induce tumour killing by immune-mediated antibody-dependent cellular cytotoxicity (ADCC)/complement-dependent cytotoxicity (CDC, e.g., rituximab, trastuzumab) and immune checkpoint inhibition through targeting of PD-1/PD-L1 and CTLA-4 (e.g., nivolumab, pembrolizumab, atezolizumab, ipilimumab). Here, PDCD1 is linked to neoplasm.